Article
Chemistry, Physical
Muhammad Naveed Khan, Sohail Nadeem
Summary: The current article investigates the flow of rotating Maxwell nanofluid with double stratification and activation energy, analyzing the impact of rotation and stretching on velocity profile and temperature as well as heat and mass transfer rates. Numerical computations show that higher rotation parameter reduces heat flux, while increasing Deborah number decreases heat and mass transfer rates, and augmenting thermophoretic parameter enhances mass transfer rate. The study's novelty lies in analyzing Maxwell nanofluid flow in a rotating frame with activation energy and thermophoretic effect, with results showing remarkable agreement with existing literature.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Multidisciplinary
Tamour Zubair, Muhammad Usman, Kottakkaran Sooppy Nisar, Muhammad Hamid, Emad E. Mahmoud, I. S. Yahia
Summary: The study focuses on the shape effects of copper nano-particles on heat transmission of three-dimensional magnetohydrodynamic nano-fluid, using the modified Chebyshev wavelets method for numerical solutions. It concludes that the modification is appropriate for the solutions, can be extended to other nonlinear problems, and reduces computing time.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Saeed Ullah Jan, Umar Khan, Saeed Islam, Muhammad Ayaz
Summary: The article investigates the flow of a ternary hybrid nanofluid with cylindrical shape nanoparticles over a stretching surface, considering the impact of variable thermal conductivity. Mathematical modeling and numerical solution techniques are used to solve the resulting system of ordinary differential equations. The study examines how physical quantities, such as magnetic field, injection/suction, nanoparticles volume fraction, and variable thermal conductivity, affect the velocity, skin friction, temperature, and local Nusselt number.
Article
Thermodynamics
M. S. Alqarni, Hassan Waqas, Metib Alghamdi, Taseer Muhammad
Summary: The research analyzes bioconvectional second-grade nanoliquid flow with implications of thermal conductivity and motile microorganism across three-dimensional sheet. The study has important applications in medical and contemporary aerospace technologies, as well as significance for energy systems.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Kamran Ahmed, Tanvir Akbar, Taseer Muhammad, Metib Alghamdi
Summary: This study investigates the flow of two-dimensional MHD Williamson nanofluid over a curved surface and examines the effects of various physical parameters on velocity, pressure, temperature, and concentration profiles.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Azeem Shahzad, Fakhira Liaqat, Zaffer Ellahi, Muhammad Sohail, Muhammad Ayub, Mohamed R. Ali
Summary: This study investigates the flow and heat transfer of Cu-nanofluid in a thin film over a stretching sheet, considering different shape factors and boundary conditions. The results show that the platelet-shaped nanoparticles have the highest heat transfer rate among the different particle shapes.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Multidisciplinary
Pentyala Srinivasa Rao, Anil Kumar
Summary: The theoretical study examines the unsteady magnetohydrodynamics free convection flow of nanofluid past an oscillation moving vertical semi-infinite permeable flat plate in a rotating frame of reference. The governing equations are solved using small perturbation approximation and the effects of various suspended metallic nano-particles and non-dimensional physical parameters on fluid flow and heat transfer rate are presented and discussed through graphs.
INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION
(2022)
Article
Engineering, Multidisciplinary
Adnan, Umar Khan, Naveed Ahmed, Syed Tauseef Mohyud-Din, Sayer O. Alharbi, Ilyas Khan
Summary: The shape of nanomaterials affects heat transfer, velocity slip significantly increases the temperature of nanofluids, and thermal radiation and the volumetric fraction of the nanomaterials favor the local heat transfer rate.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Xiao-Yang Zhang, Cun-Hai Wang
Summary: Research on phase change phenomenon has gained attention for its applications in energy storage and release. This work develops the discontinuous Galerkin method to solve the enthalpy equation and radiative transfer equation governing phase change process. The proposed method accurately captures heat and mass transfer in solidification problems and provides accurate numerical solutions for phase change problems in the presence of radiation.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
A. Aldabesh, Mazmul Hussain, Nargis Khan, Anis Riahi, Sami Ullah Khan, Iskander Tlili
Summary: This study analyzes the axisymmetric behavior of Casson nano-material between two stretchable disks using the Buongiorno nanofluid model. Similarity transformations are used to convert the governing equations into dimensionless form, and a homotopic procedure is suggested to determine the solution. The effects of various parameters on dimensionless velocity and temperature profiles are observed, with particular attention to the role of Brownian motion and thermophoresis diffusion parameters.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Hassan Waqas, Umar Farooq, Taseer Muhammad, Sajjad Hussain, Ilyas Khan
Summary: The study investigates the flow of Sutterby nanofluid with applied magnetic field and considers non-Newtonian base fluid, non-uniform thermal conductivity, nonlinear thermal radiation, and bioconvection of motile microorganisms. The numerical and graphical analysis shows the impact of different physical parameters on the velocity field, temperature field, solutal field of species, and microorganisms' profile.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Multidisciplinary Sciences
G. P. Vanitha, U. S. Mahabaleshwar, M. Hatami, Xiaohu Yang
Summary: The present study aims to predict the flow characteristics of a micropolar liquid infused with ternary nanoparticles across a stretching/shrinking surface under the impact of chemical reactions and radiation. The flow, heat and mass transfer characteristics are analyzed, including the suspension of three dissimilarly shaped nanoparticles (copper oxide, graphene, and copper nanotubes) in H2O. The governing equations are derived and transformed into ordinary differential equations for analysis. The impact of skin friction is also considered in this study, and the characteristics of the micropolar liquid are presented through graphs.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Aamir Ali, Hajra Safdar Khan, Salman Saleem, Muhammad Hussan
Summary: This paper investigates MHD nanofluid flow over a non-linear stretchable surface, examining the effects of nanometer-sized copper particles in water as well as other factors. The study concludes that the velocity of nanoparticles decreases as the magnetic field intensity increases, while the temperature of nanomaterials rises.
Article
Thermodynamics
Muhammad Amjad, Kamran Ahmed, Tanvir Akbar, Taseer Muhammad, Iftikhar Ahmed, Ali Saleh Alshomrani
Summary: This investigation examines the Williamson nanofluid flow over an exponentially stretched surface with variable thickness, applying Cattaneo-Christov double diffusion (CCDD) heat flux model for heat transfer analysis. Numerical results show the velocity, temperature, and concentration profiles, and graphs and tables demonstrate the impacts of various physical parameters on the flow problem.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mathematics, Applied
K. Veera Rddy, G. Venkata Ramana Reddy, Ali Akgul, Rabab Jarrar, Hussein Shanak, Jihad Asad
Summary: The dynamics of chemically reactive and thermally conducting Casson nanofluid flowing past an elongated sheet was investigated numerically in this study. It was found that increasing the visco-inelastic parameter and the magnetic parameter leads to a degradation of velocity profiles. Additionally, an increase in the magnetic parameter results in a decrease in the distribution of velocity. The effects of variable thermal conductivity and variable diffusion coefficient on temperature and concentration contours were also discussed. The boundary layer distributions deteriorate as the unsteadiness parameter is increased.
Article
Mathematics, Applied
Tamour Zubair, Tiao Lu, Muhammad Usman
Summary: The Vlasov-Maxwell system is studied in this article, and a novel scheme based on finite-difference and spectral approximations is proposed to construct numerical solutions. Various simulations are performed to validate the accuracy and reliability of the method, and the convergence, error bound, and stability of the suggested methods are investigated numerically. Furthermore, the developed method can be applied conveniently to examine numerical solutions of other multidimensional highly nonlinear fractional or variable order problems of physical nature.
NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS
(2023)
Article
Thermodynamics
Syed Saqib Shah, Hakan F. Oztop, Rizwan Ul-Haq, Nidal Abu-Hamdeh
Summary: This paper analyzes the buoyancy flow, mass and heat transfer in a coaxial duct under the Soret and Dufour effect. The combined effects of various parameters on natural convection are studied using a numerical approach. The results show that the Lewis number has a significant impact on mass transfer, while the buoyancy ratio parameter decreases the average rate of heat flow and increases mass transfer.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Engineering, Multidisciplinary
Bushra Ishtiaq, Ahmed. M. Zidan, Sohail Nadeem, Mohammed Kbiri Alaoui
Summary: This article presents a comparative study of magnetohydrodynamics stagnant point flow in hybrid nanofluid using the extended versions of the Yamada-Ota model and Xue model. The study considers a time-dependent and thermally radiative two-dimensional flow with a stretchable/shrinking permeable sheet. The hybrid nanofluid is formulated by suspending Aluminum Oxide Al2O3 and Copper Cu nanoparticles in water. The nonlinear dimensionless system of ordinary differential equations is solved numerically using the bvp4c methodology. The study finds that the heat transfer rate is higher in the Yamada-Ota model compared to the Xue model, and increasing the stretching parameter enhances the velocity field but deteriorates the temperature distribution.
AIN SHAMS ENGINEERING JOURNAL
(2023)
Article
Mathematics, Applied
Nadeem Abbas, Sohail Nadeem, Wasfi Shatanawi
Summary: This study presents a numerical analysis of MHD 3D second grade fluid over slendering stretching sheet, with considerations of heat generation and thermal radiation impacts. The problem is mathematically stated as PDEs and transformed to nonlinear ODEs using appropriate similarity variables. The solutions are computed using MATLAB bvp4c function and the impacts of involving parameters on velocity and temperature are analyzed. The results show the effects of various parameters on skin friction and Nusselt number.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Mathematics, Applied
Sohail Nadeem, Salman Akhtar, Nevzat Akkurt, Anber Saleem, Shahah Almutairi, Hassan Ali Ghazwani
Summary: This study mathematically investigates the heat and mass transfer during the peristaltic flow of a non-Newtonian Jeffrey fluid inside an elliptic cross-section duct. The analysis considers constant heat absorption and provides a descriptive assessment of the heat and mass transfer. Exact solutions are obtained using a polynomial solution technique for the dimensionless partial differential equations in the problem. A purposeful graphical assessment is provided for the final mathematical results. Velocity and temperature profiles reach their highest values in the core region of the duct and gradually decrease towards the duct boundaries.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Green & Sustainable Science & Technology
Wajad Ulfat, Ayesha Mohyuddin, Muhammad Amjad, Tonni Agustiono Kurniawan, Beenish Mujahid, Sohail Nadeem, Mohsin Javed, Adnan Amjad, Abdul Qayyum Ashraf, Mohd Hafiz Dzarfan Othman, Sadaful Hassan, Muhammad Arif
Summary: This study developed a thermal insulation composite material using buffing dust-laden tanning waste mixed with polystyrene and a blowing agent, aiming to promote resource recovery and a circular economy. The composite material exhibited good thermal conductivity, compression strength, density, and water absorption compared to conventional insulation panels. The addition of buffing dust reduced the thermal conductivity of polystyrene by 10%. The composite material also showed thermal stability and the presence of functional groups. Overall, this work not only solved energy consumption issues but also contributed to environmental protection and air pollution reduction through recycling and reusing buffing dust waste as thermal insulation material.
Article
Physics, Multidisciplinary
Mirza Naveed Jahangeer Baig, Nadeem Salamat, Faisal Z. Duraihem, Salman Akhtar, Sohail Nadeem, Jehad Alzabut, Salman Saleem
Summary: This study mathematically models the stagnation point flow over a heated stretching cylinder using the phase flow approach. The interaction between impinging stagnation flow and flow due to the stretching surface of the cylinder is thoroughly interpreted. Exact analytical solutions are computed and evaluated graphically. Heat transport analysis and Nusselt number interpretation are incorporated. The results show a dominant impinging stagnation flow for higher oncoming flow pressure and lower stretching velocity of the cylinder.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Physics, Applied
Sohail Nadeem, Bushra Ishtiaq, Nevzat Akkurt, Hassan Ali Ghazwani
Summary: This study focuses on the entropy analysis of a hybrid nanofluid in stagnant point flow. Nonlinear dimensionless ordinary differential equations are obtained through appropriate similarity transformations. The results show that the mixed convection parameter has a significant impact on the velocity field, entropy generation, and induced magnetic field, and both entropy and heat transfer rate increase with the increase of mixed convection parameter.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Physics, Applied
Syed Saqib Shah, Rizwan ul Haq, Hakan F. Oztop, Ali Raza
Summary: The study examines the influence of Magnetohydrodynamics (MHD) on the fluid in channel flow when a thin needle is present. A computational analysis is conducted to investigate the effects of inlet/outlet conditions with a curvilinear shaped body inserted in the channel. By using suitable dimensionless variables, the governing equations are transformed and various parameters are simulated to observe their impact on streamlines, isotherms, and temperature distribution at the mean position. The results show that Reynolds number, Richardson number, magnetic hydrodynamic, needle size and state all affect the local Nusselt number at the mean position.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Engineering, Multidisciplinary
Sohail Nadeem, Shahbaz Ali, Nevzat Akkurt, Mohamed Bechir Ben Hamida, Shahah Almutairi, Hassan Ali Ghazwani, Sayed M. Eldin, Zareen A. Khan, A. S. Al-Shafay
Summary: This paper presents a comprehensive study on the mathematical modelling and numerical simulation of non-Newtonian blood flow in an idealized stenosed artery. The results show that the non-Newtonian nature of the fluid model significantly influences flow dynamics, with a greater degree of stenosis leading to higher velocity and pressure drop. Wall shear is substantially larger in stenotic passages, and the severity of stenosis is directly related to this increasing behavior.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Sohail Nadeem, Shahbaz Ali, Jehad Alzabut, Mohamed Bechir Ben Hamida, Sayed M. Eldin
Summary: This study investigates the influence of hybrid nano-fluid on heat transport in a semi-annular channel using numerical methods. The hybrid nano-fluid consists of a liquid water with a suspension of SWCNT and MWCNT. Constant heat fluxes are applied to the channel walls. The finite volume approach is used to solve the governing equations. The results show that heat transport decreases as the volume fraction of MWCNT increases. The heat transfer from the walls to the fluid is affected by the curvature of the walls. The study provides velocity contours, isotherms, and local Nusselt number distributions for certain volume fractions of nanoparticles. It is discovered that walls with smaller curvature have stronger convection heat transfer. The pressure increases with the increase of nanoparticle volume percentage.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
S. Nadeem, R. Akber, H. A. Ghazwani, J. Alzabut
Summary: This study examines the behavior of steady and incompressible magnetohydrodynamics fluid flow with sinusoidal walls in a square cavity. The finite element method is used to numerically model the flow and heat transfer, resulting in temperature and velocity profiles. The study finds that the temperature and velocity exhibit good convergence for various parameter values. The significant impact of heat transfer rate on the results is also discussed.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
S. Nadeem, Bushra Ishtiaq, Jehad Alzabut, Hassan A. Ghazwani, Ahmad M. Hassan
Summary: This study compares the time-dependent flow of a micropolar fluid between a linear stretching sheet and an exponential stretching sheet. It is found that the exponential stretching sheet provides more consequential results compared to the linear stretching sheet. Additionally, the material parameter shows an increase in the velocity field for both types of sheets.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Jehad Alzabut, Sohail Nadeem, Sumaira Noor, Sayed M. Eldin
Summary: This article investigates the modeling and numerical simulation of Magnetohydrodynamic (MHD) buoyancy driven convection flow in a differentially heated, square enclosure. Numerical solutions are computed for different values of Rayleigh number ranging 103 < Ra < 107 and Hartmann number ranging 0 < Ha < 40. Comportment of MHD free convection heat flow from transient to steady state is numerically examined for a period of 0 to 1 s. It is seen that with increasing values of Rayleigh number there is increase in local Nusselt number distribution on heated side of the cavity, while velocity distribution in the flow domain decreases with increasing Hartmann number.
RESULTS IN PHYSICS
(2023)
Article
Thermodynamics
Sohail Nadeem, Bushra Ishtiaq, Jehad Alzabut, Sayed M. Eldin
Summary: Fractional calculus has various applications in different fields, including biology, physics, oscillation, wave propagation, and viscoelastic dynamics. This study focuses on the fractional derivative analysis of a Brinkman hybrid nanofluid with an inclined magnetic field using the Prabhakar fractional derivative and the Mittag-Leffler function. The effects of exponential heating and a vertical plate moving with exponential velocity are considered in the analysis. The results show that the fractional constraints lead to a decrease in both temperature and velocity fields.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
