Article
Thermodynamics
Caihang Liang, Xiong Yao, Miaowei Liu, Juan Du, Yuxiang Hong, Lei Zhao
Summary: The heat transfer performances of ultrapure water, n-butanol self-rewetting fluid, multi-walled carbon nanotubes nanofluid, and n-butanol self-rewetting MWCNTs nanofluid were investigated in a pulsating heat pipe. The experimental results showed that all functional working fluids had advantages in thermal transport performances compared to ultrapure water. The advantages of the n-butanol self-rewetting fluid gradually emerged with increasing thermal input, while the advantages of the nanofluid were demonstrated only at higher thermal inputs. The inclination angle and ambient temperature also had significant impacts on the thermal performances.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Kh. Hosseinzadeh, M. A. Erfani Moghaddam, M. Hatami, D. D. Ganji, Fathollah Ommi
Summary: This paper investigates the influential factors and their effects on a two-phase closed thermosyphon through experimental and numerical analyses. The study provides insights into the mechanisms and effects of various factors, such as surface tension, power input, and filling ratio, on the performance of the thermosyphon, offering guidance for the optimization of its design.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Gyuchang Kim, Seungyeop Baek, Wontak Choi, Ajeong Lee, Seunghyeon Lee, Hyomin Jeong, Yonmo Sung
Summary: This study found that 0.5 wt% Al2O3 nanofluids exhibit good dispersibility, while the addition of Al2O3 increases the fluid's surface tension and thermal conductivity.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Bineeta Singh, Pradeep Kumar
Summary: This paper experimentally investigates the heat transfer enhancement parameter of a four turns pulsating heat pipe (PHP) under different filling ratios and heat inputs. It is found that higher filling ratios facilitate better heat transfer and self-rewetting fluid performance at lower heat inputs. The study also explains the physical mechanisms of PHP thermal performance, including Marangoni effect, capillary effect, and wettability.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Chemistry, Multidisciplinary
Divya P. Barai, Bharat A. Bhanvase, Gawel Zyla
Summary: This work investigates the influence of ultrasonication duration on the thermal conductivity of Fe3O4 nanofluid. The results show that ultrasonication can increase the thermal conductivity of the nanofluid up to a certain duration, after which it starts to deteriorate. Additionally, the concentration of the nanofluid also affects the thermal conductivity, but the optimum ultrasonication time is the same for different concentrations.
Article
Chemistry, Multidisciplinary
Likhan Das, Khairul Habib, Kashif Irshad, Rahman Saidur, Salem Algarni, Talal Alqahtani
Summary: The current research focuses on formulating a new class of Therminol55-based nanofluids that incorporate an MXene/Al2O3 nanocomposite as a dispersant. The optical and thermophysical properties of the nanofluids are experimentally assessed, and the surface charge and chemical stability of the composite particles are evaluated. The results show that the formulated nanofluid has high thermal conductivity and low viscosity, making it suitable for use as a heat transfer fluid.
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
Construction & Building Technology
Ali Rehman, Waris Khan, Ebenezer Bonyah, Samsul Ariffin Abdul Karim, Ahmed Alshehri, Ahmed M. Galal
Summary: The research focuses on simulating the hybrid nanofluid to improve the heat transfer ratio by adding heat transmission mechanism in the flow model. The results demonstrate the significant influence of different parameters on the heat transfer ratio.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Hasan Naghizadeh, Reza Nosouhi, Seyed Adel Badiezadegan, Milad Soleymani, Amir Mohammad Azadi, Noushin Azimy, Hamidreza Azimy
Summary: This research investigates the effect of adding copper oxide nanoparticles to the oil Gr-6004 base fluid and its concentration changes on the surface roughness of gudgeon pin and the thermal conductivity of the nanofluids during the superfinishing process. The results show that adding nanoparticles significantly reduces the surface roughness and increases the thermal conductivity. Increasing the concentration of nanoparticles further decreases the roughness and increases the thermal conductivity. Dispersing CuO nanoparticles into the base fluid also reduces the oil temperature.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Thermodynamics
Chia-Hsuan Lin, Che-Wei Kuo, Chen-li Sun
Summary: Compared to continuous spray, intermittent spray provides effective cooling with less liquid consumption. By adjusting pulse duration and duty cycle, the cooling performance of self-rewetting fluid can be optimized for high-temperature applications, such as 1-pentanol/water mixtures recommended for intermittent spray cooling. The use of self-rewetting fluid induces inverse Marangoni convection, sustaining efficient cooling even at high surface temperatures.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
K. Sefiane, R. E. Christy, G. Duursma, J. C. Ebeling, T. Seewald, S. Harmand
Summary: There is growing interest in the use of self-rewetting mixtures for micro-scale heat transfer systems. These fluids, with increased surface tension at higher temperatures, are expected to provide enhanced evaporative cooling performance. However, the mechanism behind these improvements is not fully understood. Through studying the flow within evaporating drops of 1pentanol-water mixtures, researchers have observed three stages in the evaporation process. These stages involve the formation of a toroidal vortex, pulsating vortex, and radial outward flow.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Review
Thermodynamics
Zoljargal Narankhishig, Jeonggyun Ham, Hoseong Lee, Honghyun Cho
Summary: The review covers experimental and numerical investigations on the convective heat transfer of various nanofluids, especially hybrid nanofluids. Performance optimization of nanofluid heat and mass transfer is influenced by factors such as nanofluid characteristics, synthesis method, magnetic force, nanoparticle concentration and size, and Reynolds number. Studies have shown that the magnetic field in magnetic nanoparticles can significantly enhance the convective heat transfer performance of nanofluids.
APPLIED THERMAL ENGINEERING
(2021)
Review
Chemistry, Physical
Ramanujam Lenin, Pattayil Alias Joy, Chandan Bera
Summary: Thermal properties of nanofluids, including dispersion, stability, and heat transfer, are heavily influenced by the interfacial layer, specifically its thickness and thermal conductivity. However, the challenges in determining these factors have limited research progress in the field of nanofluids. This review aims to provide insights on optimizing nanofluid thermal properties for commercial applications.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Thermodynamics
Yuguo Gao, Yitao Ren, Minghan Xu, Junjun Liu, Arun S. Mujumdar, Agus P. Sasmito
Summary: This article prepared water-based graphene oxide (GO), Al2O3, and GO-Al2O3 hybrid nanofluids using a two-step approach, and investigated the effects of thermal cycling on the stability and thermal conductivity of nanofluid ice slurry. The study also proposed a thermal conductivity model considering thermal cycling and mass fraction. Results showed that the stability of nanofluids decreased gradually with the increase of phase change cycles, but tended to stabilize after 6 cycles. The thermal conductivity of GO-Al2O3 hybrid nanofluid ice slurry was between that of GO and Al2O3 aqueous single nanofluid after phase change thermal cycling.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Energy & Fuels
Mohanan Vasanthakumari Bindu, Gnana Muthu Joselin Herbert
Summary: By adjusting the volume concentration of nanoparticles, a ternary nanofluid composed of Al2O3, ZnO, and multiwall carbon nanotubes demonstrates significant improvements in thermal conductivity and viscosity, making it suitable for medium-temperature heat transfer applications.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
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)