Article
Engineering, Mechanical
K. Bala Subrahmanyam, Pritam Das, Aparesh Datta
Summary: This study conducted detailed numerical simulations of liquid flow in a microchannel heat sink with four different rib geometries, comparing their fluid flow and heat transfer characteristics. Results showed that FC-RR achieved the maximum Nusselt number but lower performance due to higher pressure drop, while FC-DR offered a good balance between heat transfer and pressure drop, showing the best thermal performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2021)
Article
Computer Science, Information Systems
Shizhong Zhang, Faraz Ahmad, Haseeb Ali, Sadiq Ali, Kareem Akhtar, Nisar Ali, Mohamed Badran
Summary: Traditional cooling technologies are not suitable for cooling electronic chips due to their small size and high heat generation. Microchannel heat sink (MCHS) is a promising option for better cooling performance. This study investigates the hydrothermal performance of MCHS with novel trefoil shape ribs. The results show that adding trefoil ribs to the walls of smooth microchannels significantly improves their thermal performance, although at the cost of increased pressure. The configuration with side wall trefoil ribs (MC-SWTR) has the highest thermal enhancement factor and is the most superior among all considered trefoil rib configurations.
Article
Chemistry, Analytical
Miaolong Cao, Shi Cao, Jincheng Zhao, Jiayi Zhu
Summary: This paper proposes a microchannel heat sink model and investigates the impact of built-in ribs on the flow and heat transfer characteristics. Numerical simulation results show that the rectangular rib plate enhances heat transfer, but the comprehensive evaluation factor decreases with increasing rib length. The angle of the rib plate has little influence on heat transfer, while the thickness variation has the largest impact on the comprehensive evaluation factor. The optimal parameter combination is an angle of 0 degrees, a length of 7.5 mm, and a thickness of 0.2-0.3 mm.
Article
Thermodynamics
G. Marseglia, M. G. De Giorgi, P. Pontes, R. Solipa, R. R. Souza, A. L. N. Moreira, A. S. Moita
Summary: This paper investigates the advantages and challenges of two-phase flows, specifically flow boiling of pure liquids and nanofluids, for cooling microchannel heat sinks. The study finds that even at low concentrations, the water-Au nanofluid exhibits superior cooling performance compared to other fluids, indicating that even small concentrations of nanoparticles can significantly impact heat transfer mechanisms.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Mohammad Shamsoddini Lori, Kambiz Vafai
Summary: This study conducts a detailed numerical analysis to evaluate the effect of using periodic vertical porous and solid ribs with different geometrical shapes on the fluid flow and heat transfer in a three-dimensional microchannel. The results show that the use of porous ribs leads to higher Nusselt numbers and better Figure of Merit compared to solid ribs.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Chunquan Li, Xuebin Li, Hongyan Huang, Yuanhao Zheng
Summary: A new microchannel heat sink with embedded modules with ribs and pin-fins is proposed for efficient microchannel heat dissipation. Strategies such as microchannel cooling within low-temperature co-fired ceramic substrates, embedding modules in the substrate, and creating ribs and pin-fins are employed to enhance heat transfer. The study investigates the effects of relative rib height, relative pin-fin height, and relative number of auxiliary channels on heat transfer performance, temperature uniformity, and pressure drop. The performance of the proposed design is compared to other similar designs, showing significant improvements in heat transfer and temperature uniformity with a slight increase in pressure drop.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Yifei Cheng, Xiangyu Luo, Pengfei Wang, Zhehao Yang, Jin Huang, Jiaxin Gu, Wensheng Zhao
Summary: The influence of four geometrical parameters on the performance of microchannel heat sinks was analyzed using orthogonal experimental design and fuzzy grey relational analysis. A novel offset rib structure was proposed to enhance the performance, and the optimal offset rib structure was studied at different Reynolds numbers. The results showed significant improvement in performance at high Reynolds numbers with the optimal offset rib structure.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Mechanical
K. Bala Subrahmanyam, Pritam Das
Summary: A computational study of a microchannel heat sink with various rib configurations and secondary channels was conducted to investigate the influence of geometrical parameters on heat transfer characteristics and determine the optimal configuration.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Energy & Fuels
Sadiq Ali, Faraz Ahmad, Kareem Akhtar, Numan Habib, Muhammad Aamir, Khaled Giasin, Ana Vafadar, Danil Yurievich Pimenov
Summary: The study found that adding trefoil ribs to any wall improves heat transfer characteristics but increases friction factor. Pressure drop and heat transfer coefficient show similar trends, with highest values for MC-AWTR, followed by MC-SWTR, and lowest for MC-BWTR. The thermal enhancement factor is highest for MC-SWTR, followed by MC-BWTR, and lowest for MC-AWTR, with an increase with Reynolds number in each case.
Article
Thermodynamics
K. Derakhshanpour, R. Kamali, M. Eslami
Summary: The study conducted 3-Dimensional numerical simulations to analyze laminar fluid flow and forced convection heat transfer through novel designs of microchannel heat sinks with cylindrical ribs. Incorporation of cylindrical ribs significantly enhanced heat transfer coefficient and reducing rib pitch had a greater effect on improving hydrothermal performance. Additionally, double-layered microchannels showed higher convection heat transfer coefficient and double-layered-design 1 microchannels performed the best with increased mass flow rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Anurag Maheswari, Yogesh K. Prajapati
Summary: In the present study, a three-dimensional numerical simulation was conducted to investigate the thermohydraulic performance of a novel design of double-layer microchannel heat sinks. The modified heat sink with an intermediate rectangular fin and different hole shapes significantly enhanced the heat transfer rate by approximately 45-60% compared to the conventional design. However, higher pressure drops were observed due to flow restrictions. Among all the cases considered, heat sinks with circular and triangular holes showed superior thermal performance with a marginal difference of approximately 2-5%. The improved heat transfer rate in the modified heat sink was attributed to better fluid mixing and thinner boundary layers facilitated by the fins with holes. Optimization analysis identified a heat sink with a hole radius of 0.286 mm and 15 holes as the superior configuration, achieving a maximum heat transfer rate approximately 51-64% higher than the conventional design.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Shijie Liu, Wenyuan Xie, Qinggong Wang, Yiwei Liu, Nan Hu
Summary: Thermal management is a critical problem in high-power laser systems, especially for the laser crystal component. This study proposes a specialized central-jetting microchannel heat sink (MCHS) for small-size laser crystals with high heat fluxes. Experimental results show that the MCHS has a high heat transfer coefficient and effective cooling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Lin Liu, Ziyong Cao, Chao Xu, Ling Zhang, Te Sun
Summary: This paper focuses on the numerical investigation of fluid flow and heat transfer characteristics in a microchannel heat sink with double-layered staggered cavities. The effects of expansion-to-contraction ratio and height ratio on the thermal performance are studied using numerical simulation. The results show that the double-layered staggered cavities can enhance heat transfer significantly.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Hui Li, Jinrong Zhu, Congle Wang, Dongqing Dai, Hui Lv, Qinghua Lv
Summary: In this study, the characteristics of fluid flow and heat transfer in a newly designed microchannel heat sink with fan-shaped cavities and ribs were investigated through three-dimensional numerical simulation. The results showed that the overall performance index of the heat sink reached a high value under specific geometric parameters.
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2023)
Review
Thermodynamics
Daxiang Deng, Long Zeng, Wei Sun
Summary: This paper comprehensively reviews recent advancements in flow boiling enhancement and fabrication of enhanced microchannels. It emphasizes the flow boiling enhancement performance of these enhanced microchannels in microchannel heat sinks, while also discussing their advantages and disadvantages after summarizing the classification and manufacturing methods of enhanced microchannels.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Hong Wei Xian, Nor Azwadi Che Sidik, G. Najafi
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2019)
Article
Thermodynamics
Rasul Mohebbi, Mohsen Izadi, Nor Azwadi Che Sidik, Gholamhassan Najafi
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2019)
Review
Thermodynamics
M. A. M. Irwan, C. S. Nor Azwadi, Y. Asako, J. Ghaderian
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Thermodynamics
Hong Wei Xian, Nor Azwadi Che Sidik, R. Saidur
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2020)
Article
Energy & Fuels
Navid Aslfattahi, R. Saidur, A. Arifutzzaman, R. Sadri, Nuno Bimbo, Mohd Faizul Mohd Sabri, Philip A. Maughan, Luc Bouscarrat, Richard J. Dawson, Suhana Mohd Said, Boon Tong Goh, Nor Azwadi Che Sidik
JOURNAL OF ENERGY STORAGE
(2020)
Article
Engineering, Marine
Saeed Jamei, Adi Maimun, Rasul Niazmand Bilandi, Nor Azwadi, Simone Mancini, Luigi Vitiello, Maria De Carlini
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2020)
Article
Thermodynamics
Syed Nadeem Abbas Shah, Syed Shahabuddin, Mohd Faizul Mohd Sabri, Mohd Faiz Mohd Salleh, Mohamad Azlin Ali, Nasir Hayat, Nor Azwadi Che Sidik, Mahendran Samykano, R. Saidur
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Muhammad Arif Bin Harun, Prem A. L. Gunnasegaran, Nor Azwadi Che Sidik, M'hamed Beriache, Javad Ghaderian
Summary: The study compared the thermal performance of loop heat pipes using different types of nanofluids, finding that the thermal resistance decreased with increasing mass concentration for diamond and Al2O3 nanofluids, while SiO2 nanofluid showed the opposite trend. Diamond nanofluid exhibited the lowest thermal resistance and better heat capacity and enhancement compared to Al2O3.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Hayder Mohammad Jaffal, Ihsan Ali Ghani, Ahmed Ramadhan Al-Obaidi
Summary: The 3D numerical analysis evaluated a new configuration of corrugated tube with interruptions, finding that the Nusselt number was 39% higher than the conventional smooth tube. The interruptions in corrugations significantly reduced pressure drop while increasing the flow area.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Proceedings Paper
Green & Sustainable Science & Technology
W. X. Hong, N. A. C. Sidik, R. Saidur
INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND GREEN TECHNOLOGY 2019
(2020)
Proceedings Paper
Green & Sustainable Science & Technology
M. A. M. Irwan, C. S. Nor Azwadi, Y. Asako
INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND GREEN TECHNOLOGY 2019
(2020)
Proceedings Paper
Green & Sustainable Science & Technology
Tung Hao Kean, Nor Azwadi Che Sidik
INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND GREEN TECHNOLOGY 2019
(2020)
Proceedings Paper
Green & Sustainable Science & Technology
Muhammad Arif Bin Harun, Nor Azwadi Che Sidik
INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND GREEN TECHNOLOGY 2019
(2020)
Article
Thermodynamics
Siti Nurul Akmal Yusof, Yutaka Asako, Mohammad Faghri, Lit Ken Tan, Nor Azwadi bin Che Sidik, Wan Mohd Arif bin Aziz Japar
FRONTIERS IN HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Ahmed Waheed Mustafa, Ihsan Ali Ghani
HEAT TRANSFER-ASIAN RESEARCH
(2019)
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)
