Article
Mechanics
Himanshu Mishra, Anubhab Roy, S. Vengadesan
Summary: This study investigated the linear stability characteristics of a two-layered liquid-liquid flow in an inclined channel with slippery walls. The role of wall slip on the multiple base states associated with each holdup solution was analyzed. It was found that the wall slip could have both stabilizing and destabilizing effects depending on the flow rates and the value of holdup-the location of an interface.
Article
Chemistry, Physical
Mohamad Klazly, U. S. Mahabaleshwar, Gabriella Bognar
Summary: This study aims to investigate the application of nanofluids for improving heat transfer in a backward-facing step channel. Numerical simulations and experimental comparisons were conducted to evaluate the performance of different fluid models. The results show that nanofluids can enhance heat transfer in the backward-facing step channel, and there are differences in the predictions of fluid dynamics and thermodynamics among different models.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Chemical
Paloma Lins Barros, Farhad Ein-Mozaffari, Ali Lohi
Summary: Gas dispersion in non-Newtonian fluids is commonly encountered in chemical, biochemical, and food industries, with mechanically agitated vessels promoting high contact between phases. Mixing non-Newtonian fluids is challenging and requires comprehensive knowledge of mixing flow for accurate vessel design. This review presents researchers' developments in this field, describing mixing variables and the advantages of using computational fluid dynamics tools to understand the complex flow dynamics in these systems.
Article
Engineering, Multidisciplinary
Morteza Bayareh
Summary: This review paper provides an overview of heat transfer of non-Newtonian nanofluids flowing in macro- and micro-channels using single-phase and two-phase approaches. The paper discusses the governing equations for different types of non-Newtonian fluids and presents several advances in the field. It is revealed that single-phase approaches cannot provide precise predictions due to the lack of accurate correlations. The paper emphasizes the importance of understanding nanoparticle distribution and migration in channels or ducts.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Chemical
Rufat Sh Abiev
Summary: Based on a recently published mathematical model, this paper presents an extension that allows for the calculation of important parameters in two-phase Taylor flow of non-Newtonian fluids. The obtained results are crucial for mass transfer models and understanding the influence of parameters on heat and mass transfer intensity.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Qichen Shang, He Wang, Xingyu Xiang, Chunying Zhu, Youguang Ma, Taotao Fu
Summary: The effects of yield stress on the flow pattern, breakup mechanism, formation frequency and size of droplets at T-junctions within symmetrical parallelized microchannels are investigated. Different flow patterns are observed, and the yield stress is found to significantly slow down the droplet formation. The stable and uniform operating ranges of liquid-liquid two-phase flow in yield stress non-Newtonian fluids are obtained, and semi-empirical formulas for droplet size prediction are established.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Thermodynamics
Naser Hazeri-Mahmel, Younes Shekari, Ali Tayebi
Summary: This study involves a 3D analysis of forced convection of Newtonian and non-Newtonian nanofluids through a horizontal pipe using single- and two-phase mathematical models. The results show that the non-Newtonian mixture model provides more accurate results for a volume fraction of 0.01, and the heat transfer coefficient increases with increasing solid volume fraction in the mixture models.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Materials Science, Multidisciplinary
M. T. Aranda, I. G. Garcia, A. Quintanas-Corominas, J. Reinoso
Summary: This study investigates the parameters setting of curved weak interfaces as crack arrestors in structures. It is found that the ratio of interface to bulk fracture toughness has a clear effect on crack deviation. However, the results vary among different analysis methods due to their different assumptions.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Chemical
Meljin Madavana Paul, Leila Pakzad
Summary: The hydrodynamics of air bubble rise in shear-thinning non-Newtonian liquids in bubble columns were investigated through computational fluid dynamics (CFD). The study found that the bubble size distribution and gas holdup significantly impact mass transfer rates and reactor design. Various factors affecting gas velocity, flow index, consistency index, sparger bubble size, and yield stress were analyzed on both local and global scales.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Sohail Nadeem, Salman Akhtar, Anber Saleem, Nevzat Akkurt, Shahah Almutairi, Hassan Ali Ghazwani, Sayed M. Eldin
Summary: Entropy interpretation and descriptive heat generation analysis are conducted for heated flow between two homocentric and sinusoidally fluctuating curved tubes. A novel peristaltic endoscope is studied inside a curved tube for the first time, with evaluation of heat transfer and entropy. A comprehensive mathematical model is developed, and computations using Mathematica software provide exact solutions and graphics. The entropy shows a lower rate near the central region of the curved tubes, but reaches a maximum near the sinusoidally deformable walls of both the endoscope and channel.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Chemical
Kai Feng, Huichen Zhang
Summary: Experimental study on gas-non-Newtonian fluid flow in a horizontal square microchannel revealed different flow patterns and flow regime maps compared to water. Non-Newtonian behavior of the liquid phase significantly influenced the two-phase pressure drop, and the relationship between pressure drop and gas and fluid flow rates depended on flow pattern. A new correlation considering gas-liquid flow rate ratio and rheological properties of the liquid phase accurately predicted pressure drop data with low percentage errors.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Mathematics, Applied
T. Aryeni, Q. Deng, V Ginting
Summary: This paper discusses the application of the generalized finite element method (GFEM) in approximating the solutions of quasilinear elliptic equations with multiple interfaces in one dimensional space. By constructing certain enrichment functions and adopting the Lagrange multiplier technique to ensure local conservation, it overcomes the issue of decreased accuracy in standard finite element methods under spatial discontinuity.
JOURNAL OF SCIENTIFIC COMPUTING
(2022)
Article
Engineering, Chemical
Kai Feng, Gang Yang, Jiaxin Liu, Huichen Zhang
Summary: An experiment was conducted to study the phase distribution and pressure drop at the bifurcation in a horizontal psi-shaped branching microchannel. The results showed a significant separation of gas phase from the side arm, while a uniform distribution could be achieved for the churn flow in water. Additionally, a large pressure drop occurred at the bifurcation of the side arm under the effect of the vortex in the liquid slug near the bubble nose.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Thermodynamics
Sajedeh Kebriti, Hamed Moqtaderi
Summary: This study developed a two-dimensional enthalpy-based lattice Boltzmann method to simulate the non-Newtonian melting process inside an enclosure. The effects of flow behavior index and Rayleigh number on Nusselt number and melting front position were investigated. Results showed that with an increase in flow behavior index, the average Nusselt number at the hot wall and the rate of melting decreased.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Engineering, Chemical
Yunfei Ling, Jiguo Tang, Hongtao Liu
Summary: The study found that adding fenestrated patches after B-T shunt can improve the unbalanced perfusion to branch outlets but may increase energy loss. Decreasing the fenestrated diameter can increase the flow distribution ratio of poorly-grown arteries but also lead to higher energy loss.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Thermodynamics
Pengfei Liu, Ranjith Kandasamy, Jin Yao Ho, Jinlong Xie, Teck Neng Wong
Summary: The experimental study shows that increasing surface roughness can enhance spray cooling heat transfer, with an accuracy of 15% for empirical correlation on structured flat surfaces. There exists a decoupling relationship between micro-roughness and macro-structure enhancing mechanisms, with different impacts on surfaces with different structures.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Lu Shen, Junheng Ren, Fei Duan
Summary: Experimental investigations reveal the linkage of nonuniform interfacial temperature and flow field in an ethanol droplet evaporating on a heated substrate before the final phase of drying. The Benard-Marangoni instability is suggested to be responsible for the regular thermal patterns formed at the evaporating interface. The evolution of deformed Benard-Marangoni convection cells in the sessile droplet is solely dependent on the instant contact angle.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Polymer Science
Baris Burak Kanbur, Yi Zhou, Suping Shen, Kim Hai Wong, Charles Chen, Abe Shocket, Fei Duan
Summary: This study focuses on the manufacturing of plastic injection mold inserts with conformal cooling channels (CCCs) using metal additive manufacturing (MAM). The research includes computational simulations, performance assessments, and multiobjective optimization to achieve better cooling performance and thermal uniformity compared to traditional channels.
Article
Energy & Fuels
Y. S. See, J. Y. Ho, K. C. Leong, T. N. Wong
Summary: In this study, a topology-optimized heat sink with a phase change material is developed for electronics cooling. The heat sink is fabricated using Selective Laser Melting and has better performance than conventional heat sinks, with lower base temperature. However, its operation time is longer due to slower melting caused by natural convection optimization.
Article
Thermodynamics
Jakub Deja, Iman Dayyani, Martin Skote
Summary: Using arresting gear systems, the kinetic energy dissipated during commercial aircraft landings can be converted to electricity, improving energy efficiency and environmental sustainability. This paper presents a novel design that successfully recovers aircraft kinetic energy and is applicable to different aircraft sizes.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Vadim Maltsev, Dean Yuan, Karl W. Jenkins, Martin Skote, Panagiotis Tsoutsanis
Summary: In this paper, a family of high-order non-oscillatory hybrid DG-FV schemes is developed for mixed-element unstructured meshes. By switching between a DG method and a FV method based on the CWENOZ scheme, the schemes can maintain the high accuracy of DG in smooth regions and the robustness of FV in regions with strong gradients. The CWENOZ variant used has the same accuracy as the DG variant and simplifies the implementation on unstructured meshes. The investigation of several parameters associated with the switching process is conducted, and the methods are successfully applied to solve the 2D and 3D Euler equations.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Engineering, Manufacturing
Bing Lu, Hongliang Li, Mingyang Li, Teck Neng Wong, Shunzhi Qian
Summary: This study evaluates the effects of fluid catalytic cracking (FCC) ash on hydration, rheology, and compressive strength in high-performance high-speed 3D concrete printing (3DCP). The optimal substitution rate of FCC ash for cement is determined as 20 wt. %. A cylinder with 240 mm diameter and 500 mm height is successfully printed at a high speed of 100 mm/s using the optimal mixture. The optimal mixture also shows good leaching performance and reduces CO2 emission by 21.45% and materials' cost by 17.98% compared with the control.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Aerospace
Saeed Mahjouri, Rasoul Shabani, Martin Skote
Summary: This paper presents a conceptual design of a new experimental setup based on a centrifugal mechanism to simulate the tire spin-up dynamics of aircraft. The proposed setup allows for adjustment of landing velocity, sink rate, and vertical ground load using low-power actuators, enabling the simulation of different types of aircraft in a limited laboratory space.
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
(2023)
Article
Thermodynamics
Jing Zhou, Baris Burak Kanbur, Duc Van Le, Rui Tan, Fei Duan
Summary: With the rapid development of information technology, the increase in the number and scale of data centers highlights the importance of energy-saving cooling. This study proposes multi-criteria assessments to analyze the comprehensive interactions of internal and external factors in air-cooled data centers. The impacts of refrigerant charge, evaporation pressure control limits, and hot aisle containment on increasing supply air temperature are compared and analyzed. Overall, increasing the supply air temperature leads to a decrease in power usage effectiveness, but the effects of refrigerant charge and evaporation pressure control vary depending on the thermoeconomic aspects.
Article
Thermodynamics
Li Yi, Fei Duan, Minqiang Pan
Summary: This paper proposes an immersion spray array cooling vapor chamber (ISVC) for high-power electronic devices and conducts experimental and numerical studies on thermal performance and flow pattern. It is shown that increasing the inlet temperature of the coolant facilitates the heat transfer performance and temperature uniformity of the ISVC within the safe working temperature range of electronic devices. The ISVC achieves enhanced heat transfer capacity and temperature uniformity with larger inlet flow rates, compared to existing integrated heat sink combined vapor chamber and array jet impingement. The operating limit heating power of the ISVC is increased by at least 68%.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Marine
Yuqing Hou, Hui Li, Hong Chen, Shengnan Shen, Fei Duan, Wei Wei, Jiayue Wang, Yicang Huang, Xiawei Guan, Yinghao Liao
Summary: This study proposes a novel SEConv1D framework for predicting the hydrodynamic characteristics of unidentified underwater vehicles. The framework combines Conv1D and SENet, and uses a hydrodynamic dataset based on CFD that is verified by experiments. The results show that the framework can accurately predict the total resistance coefficient (Cd) of REMUS UUV and SUBOFF AFF-1, with a small error compared to experimental data and significant reductions in error compared to other popular network models.
Article
Chemistry, Physical
Jiaxing Song, Mengying Liu, Xiangchao Ma, Quanwei Tian, Jingkai Feng, Xiting Zhong, Fei Duan
Summary: The thermal decomposition behaviors of alpha (α) and beta (13) manganese dioxide (MnO2) nanorods are investigated. Differential scanning calorimeter and thermogravimetric analysis are used to study the thermal process difference. X-ray diffraction analysis and scanning electron microscope are employed to examine crystal structures and morphologies at different temperatures. The results show that α-MnO2 nanorods have better thermal resistance than 13-MnO2, which is important for the selection of thermal stable materials in electrochemistry industries and energy materials application.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Mechanics
Zhonglu Lin, Dongfang Liang, Amneet Pal Singh Bhalla, Ahmed A. Sheikh Al-Shabab, Martin Skote, Wei Zheng, Yu Zhang
Summary: This study investigates the hydrodynamic mechanism of fish schools and finds that wavelength and Strouhal number have a significant impact on net thrust, while Reynolds number has a minor effect. Additionally, mirror-symmetric schooling can achieve a higher net thrust compared to individual swimmers.
Article
Biochemical Research Methods
Wenhan Zhao, Xiaopeng Shang, Boran Zhang, Dan Yuan, Binh Thi Thanh Nguyen, Wenshuai Wu, Jing Bo Zhang, Niancai Peng, Ai Qun Liu, Fei Duan, Lip Ket Chin
Summary: This study systematically investigates the flow transition process in the hydrodynamic focusing mechanism, revealing the transition from the squeezed focusing state to the over-squeezed anti-focusing state. The recovery rate of cell analysis can be maintained by limiting the Reynolds number below 30. These findings provide new insights into microfluidic cytometric analyses with various applications in food safety, water monitoring, and healthcare sectors.
Article
Physics, Fluids & Plasmas
Ahmed A. Sheikh Al-Shabab, Bojan Grenko, Dimitrios Vitlaris, Panagiotis Tsoutsanis, Antonios F. Antoniadis, Martin Skote
Summary: The flow field development through a simplified shock absorber orifice geometry was investigated using Large Eddy Simulation. The impact of orifice shape on flow characteristics was discussed, revealing the presence of flow disturbances and high turbulence intensity.
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)
