Article
Thermodynamics
Yugao Ma, Hongxing Yu, Xueqing Wang, Yingnan Zhang, Shanfang Huang, Chenglong Wang, G. H. Su, Xiaoqiang He, Ruicheng Zhong, Jian Deng, Xiaoming Chai
Summary: This study experimentally investigates the capillary limit of liquid metal wick heat pipes, exploring the transient temperature variations and physical mechanisms under high heat fluxes, frozen startup, and various inclination angles. The experiments reveal that the capillary limit leads to a rapid temperature increase of about 5 degrees C/s at the evaporator end, while the condenser and adiabatic section temperatures decrease. Dryout oscillations were observed with positive inclinations before reaching the capillary limit. After the capillary limit, reducing the power just below the limit does not result in heat pipe recovery, but reducing the power by about 30% of the critical heat flux is necessary.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Yuguo Gao, Qianchao Hu, Yitao Ren, Xinyu Wang, Shuman Guo, Zhonglan Hou, Pengyan Guo
Summary: Nanofluids have been found to effectively enhance the heat transfer performance of different types of heat pipes. This paper provides a comprehensive literature review on the application of nanofluids in thermosyphon heat pipe, pulsating heat pipe, and wick heat pipe. The influence of important variables such as different nanoparticles, concentrations, packing ratios, inclination angles, and thermal loads on heat pipe performance is discussed. Studies show that there is an optimal nanoparticle concentration for highly efficient utilization. The enhanced heat transfer performance is attributed to the enhanced Brownian motion, improved surface wettability, increased nucleation sites, and inherently high thermal conductivity of nanofluids. Finally, the current problems and future trends of heat pipe technology based on nanofluids are discussed.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Joseph P. Mooney, Vanessa Egan, Jeff Punch
Summary: This paper proposes a non-destructive method to analyze the impact of bend angle on the thermal performance of a sintered copper wick heat pipe. A calorimeter-based technique is used to characterize the thermal performance of the heat pipe under different bend angles. The results show that the thermal resistance of the heat pipe increases by up to 31% as the pipe is bent by 90 degrees, while the maximum heat input decreases by 29%.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2023)
Article
Construction & Building Technology
Wei -Wei Wang, Yong-Juan Song, Chun -Yu Zhang, Hong-Liang Zhang, Yang Cai, Fu-Yun Zhao, Jiang-Hua Guo
Summary: In this study, the thermal performance enhancement of a pulsating heat pipe (PHP) using a modified working fluid was investigated through experiments and numerical simulations. The experimental results showed that the proposed modified nanofluid significantly improved the pumping and pulsation motions of the PHP, leading to enhanced thermal performance. The numerical simulations further confirmed the superior heat transfer performance of the modified nanofluid. This research provides valuable insights for the application of PHP with modified nanofluids in building energy conversion and management, as well as electronic cooling.
ENERGY AND BUILDINGS
(2023)
Review
Physics, Multidisciplinary
Pawel Szymanski, Richard Law, Ryan J. McGlen, David A. Reay
Summary: This paper reviews the current advances in Loop Heat Pipes (LHP) with flat evaporators and discusses the challenges in the wide implementation of this technology. It presents solutions to improve the overall thermal performance, heat transfer distance, start-up time, manufacturing cost, weight, and possibilities of miniaturization in flat-shape LHP for passive cooling systems in electronic devices.
Article
Thermodynamics
Kalind Baraya, Justin A. Weibel, Suresh V. Garimella
Summary: Heat pipes and vapor chambers are passive thermal management devices used for efficient heat transport by phase change. They can withstand power pulses exceeding the capillary limit for brief time intervals and recover from dryout-induced thermal hysteresis. A new testing protocol is proposed to experimentally characterize the maximum hysteresis signature for a heat pipe after dryout.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Metallurgy & Metallurgical Engineering
Saif Ullah Khalid, Hafiz Muhammad Ali, Muhammad Ali Nasir, Riffat Asim Pasha, Zafar Said, L. Syam Sundar, Ahmed Kadhim Hussein
Summary: Heat pipes are widely used for thermal management, and comparing the performance of sintered copper wick and grooved heat pipes shows significant differences in capillary pressure, operating temperature, and thermal resistance, with grooved heat pipes reaching equilibrium faster.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Thermodynamics
Srivathsan Sudhakar, Justin A. Weibel, Suresh Garimella
Summary: Two-phase passive heat transport devices use porous evaporators for phase change and fluid transport. This study presents a new semi-empirical model for predicting thermal resistance and dryout during boiling in capillary-fed evaporators. The model considers thermal conduction, volumetric evaporation, and capillary-driven liquid flow to obtain temperature distribution and local pressures within the porous structure. The model successfully predicts trends in dryout limit with particle size, heater size, and evaporator thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Thermodynamics
S. Movaghgharnezhad, J. Darabi
Summary: The paper provides an overview of the development of Micro-/Nanostructured wicks for passive cooling systems, highlighting their high capillary pressure, large permeability, and larger areas for evaporation which lead to significantly higher heat removal capability and dryout heat flux. Various types and geometries of wick structures and their performance are discussed, along with limitations and recommendations for future investigations.
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2021)
Article
Thermodynamics
Zhaoxiao Wang, Hui Zhang, Lei Yin, Di Yang, Gang Yang, Nevzat Akkurt, Dinghai Liu, Lidong Zhu, Yujie Qiang, Fan Yu, Qian Xu, Yaxuan Xiong
Summary: This paper investigates the thermal conductivity performance of different nanofluids in a gravity heat pipe at different inclination angles, and finds that the hybrid nanofluid with the same mass fraction can enhance heat transfer efficiency compared to a single nanofluid.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Chao-Zhong Qin, Xin Wang, Huaijun Zhang, Mahmoud Hefny, Han Jiang, Jian Tian, Wen Deng
Summary: Spontaneous imbibition is a crucial process in various subsurface and industrial applications involving two-phase flow. However, the lack of an efficient and reliable pore-scale model has hindered our understanding of how pore-filling events during spontaneous imbibition affect average transport properties and the trapping of nonwetting fluids. In this study, we experimentally verify a computationally efficient image-based dynamic pore-network model for spontaneous imbibition and conduct case studies on Nubian sandstone. Our findings reveal that the widely used Young-Laplace equation significantly overestimates the average capillary pressure in cocurrent spontaneous imbibition due to the lack of parameterization for dynamic pore-filling and air entrapment. Based on our numerical results, we elucidate the competition of pore-filling events at different viscosity ratios of wetting and nonwetting fluids. Our model provides a valuable tool for predicting spontaneous imbibition quantitatively in geological formations and bridges the gap between pore-scale flow dynamics and the Darcy theory of spontaneous imbibition.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Chemical
Fuat Kaya
Summary: This paper investigates the effects of boron nitride (BN) and other nanoparticles (Al2O3, CuO and TiO2) on pressure drop and heat transfer in a microchannel using computational fluid dynamics (CFD). The results show that BN has better heat transfer performance compared to other nanoparticles due to its high thermal conductivity and low density. However, it slightly increases pressure losses. Additionally, BN is chemically stable at high temperatures and can be used in cooling systems without agglomeration issues.
Article
Thermodynamics
Ghassan F. Smaisim, Hayder Al-Madhhachi, Azher M. Abed
Summary: The production of electric vehicles and their accessories is growing in the automotive industry. However, poor thermal management has led to thermal failures in batteries, which are the heart of these vehicles. To address this issue, looped heat pipes were used to transfer excessive temperature on batteries using nanofluids. The experiment results were validated using computational fluid dynamics.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Maroosol Yun, Wei-Ting Hsu, Dong Il Shim, Juyeong Nam, Jae Hun Heo, Jung-Youn Song, Kyu Tae Park, Dong Hyun Lee, Hyung Hee Cho
Summary: With the advancement in chip integration, capillary heat pipes are becoming increasingly important for thermal management of high-heat-flux electronic devices. By utilizing a thermal circuit model and 3D printing, it is possible to design and fabricate heat pipes with desired heat transfer performance.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Gangtao Liang, Han Yang, Jiajun Wang, Shengqiang Shen
Summary: This study assesses the pool boiling critical heat flux (CHF) of nanofluids, demonstrating that the maximum CHF ratio of nanofluid to base fluid can reach 4 and 4.6 for different orientations of heaters. The type of heater (wire or block) has a significant impact on CHF, with direct electric-heating wire heaters accelerating nanoparticle deposition. Pressure and nanoparticle size affect CHF, but dispersion level of particles in base fluid plays a more crucial role in determining CHF ratio.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Thermodynamics
A. L. Sriram Sudhan, K. Ramachandran, A. Brusly Solomon, C. P. Jawahar
Summary: Heat pipes are silent heat transfer devices that utilize boiling and condensation for operation and have undergone several technological upgrades. This paper reviews the performance of heat pipes with nanoparticles deposition and suitable coatings, summarizing various heat transfer mechanisms involved. The study aims to provide a better understanding of the required improvements in cooling devices for future research and development of advanced cooling gadgets.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Materials Science, Multidisciplinary
R. Raja, Lijin George, Sabitha Jannet, Prudthvi Vijay Simha, Sumanth K. Ratna
Summary: In this study, SiC, TiO2, and Biochar were reinforced in Aluminium Alloy 5083 O using stir casting technique. The reinforced composite exhibited higher ultimate tensile strength, ductility, and microhardness, as well as lower wear rate compared to the base metal. FESEM analysis revealed the distribution of particles in the metal matrix.
ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES
(2022)
Article
Thermodynamics
Stephen Manova, Lazarus Godson Asirvatham, Jefferson Raja Bose, Trijo Tharayil, Somchai Wongwises
Summary: Experimental investigation on the heat transport capability of a multiport minichannel thermosyphon revealed that the optimal confluence length of 5 mm and inclination angle of 90 degrees resulted in significant enhancements. These enhancements included reductions in thermal resistance and evaporator wall temperature, as well as an increase in evaporator heat transfer coefficient compared to the case with confluence length of 0 mm. Factors contributing to this enhancement included reduced entrainment effect, surface tension effect, and the presence of thin film at flat sides of the multiports.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
A. L. Sriram Sudhan, A. Brusly Solomon, Shyam Sunder
Summary: The study models the heat transport limitations of anodized grooved heat pipes under different gravity conditions, finding that ammonia coolant combined with semi-spherical pores in the anodized grooved heat pipes enhances heat transfer efficiency, especially for space applications.
APPLIED THERMAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
R. Raja, Sabitha Jannet, Lenin Dallas, Aibel Sam Saju, S. Rajesh Ruban
Summary: Aluminium metal matrix composites have extensive applications in automobile, aircraft, and marine sectors, making them the subject of extensive research. In this study, AA6063MgO/(Al2O3) flyash hybrid surface composites were fabricated using friction stir processing. The mechanical properties were evaluated, and the results showed that the addition of 12% reinforcement improved the tensile strength and hardness of the material but reduced the elongation.
INTERNATIONAL JOURNAL OF MATERIALS & PRODUCT TECHNOLOGY
(2022)
Article
Engineering, Chemical
Tao Zhang, Xin Guo, Brusly Solomon, Mohsen Sharifpur, Li-Zhi Zhang
Summary: In this study, a hydrophobic-hydrophilic composite hollow fiber membrane with remarkable antiwetting and antifouling properties was successfully prepared to address the issues of membrane fouling and wetting in seawater desalination. The membrane, prepared using a chemical grafting method, exhibited low moisture transfer resistance and a superhydrophobic surface, resulting in a sustained high permeate flux.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Physics, Applied
G. G. Soundarya, B. Nalini, K. Ramachandran, P. Balraju, P. Priyanka
Summary: This study demonstrates the potential of plasma carbon synthesized from bark of Prosopis juliflora as an electrode material for supercapacitor applications. The plasma carbon exhibits excellent electrochemical properties and a porous structure, resulting in high specific capacitance and energy density in different device configurations.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
K. Ajith, Mallolu Jesse Aaron, Archana Sumohan Pillai, I. V. Muthuvijayan Enoch, A. Brusly Solomon, M. Sharifpur, J. P. Meyer
Summary: This investigation focuses on the influence of a magnetic field on the thermophysical properties and heat transfer of low-density ferrofluid. The optimal volume fraction of 0.05% was found to have the highest heat transfer performance at a wall temperature difference of 25 degrees C, with significant improvements compared to water.
APPLIED NANOSCIENCE
(2022)
Article
Engineering, Mechanical
R. S. Anand, C. P. Jawahar, A. Brusly Solomon, Evangelos Bellos, X. Ajay Vasanth
Summary: Nanorefrigerants, such as Al2O3/R134a, are found to improve heat transfer and reduce thermal resistance when applied in a two-phase closed thermosyphon. A new correlation is proposed to predict the heat transfer rate of nanorefrigerants in the thermosyphon.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
R. Jesinthaangel, G. Gomathi Jawahar
Summary: The article presents a new oscillation criteria that improves the existing results for the third order neutral delay difference equation with a negative coefficient in the neutral term.
PRZEGLAD ELEKTROTECHNICZNY
(2022)
Article
Thermodynamics
Stephen Manova, Lazarus Godson Asirvatham, Appadurai Anitha Angeline, Sheno Jerbin, Jefferson Raja Bose, Rajesh Nimmagadda, Russel Jayaseelan, Somchai Wongwises
Summary: This experimental study compared the heat transfer performance of copper screen mesh wick and metal foam inserted evaporator section in miniature loop thermosyphon. Results showed that the metal foam had better heat transfer performance compared to the copper screen mesh wick, making it a superior choice for thermal management in electronic devices.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Jefferson Raja Bose, Stephen Manova, Appadurai Anitha Angeline, Lazarus Godson Asirvatham, Sneha Gautam
Summary: A numerical simulation was conducted to study the convective heat transfer coefficient (h(conv)) of Cu-Water and TiO2-Water nanofluids in a circular tube under laminar and turbulent flow conditions. The analysis involved four different concentrations of nanofluids and varying Reynolds numbers. The study found that the enhancements of h(conv) for both nanofluids were higher in turbulent flow compared to laminar flow, and were mainly influenced by the random motion and heat diffusion of the nanoparticles.
Proceedings Paper
Materials Science, Multidisciplinary
G. Pitchayyapillai, M. Jinnah Sheik Mohamed, G. Dhanraj, R. Malkiya Rasalin Prince, M. Rajeshwaran, Amol Mangrulkar
Summary: This research investigates the impact of Boron Carbide on the mechanical and tribological behavior of AZ91 Magnesium alloy composite. AZ91 Magnesium Alloy Particulate-reinforced composites were prepared by addressing the wetting problem between B4C and liquid magnesium metal. K2TiF6 was used as a flux and T6 thermal treatment was performed on the produced magnesium B4C composites. The composite with increased ceramic phase exhibited higher hardness compared to the base alloy.
MATERIALS TODAY-PROCEEDINGS
(2022)
Article
Thermodynamics
Sireesha Veeramachaneni, Srinivas Kishore Pisipaty, Dharma Rao Vedula, A. Brusly Solomon, V. Sree Harsha
Summary: A novel hybrid nanofluid has been experimentally tested for its effects on the heat transfer performance of flat rectangular loop heat pipe, showing higher performance than water in terms of thermal resistance and effective thermal conductivity.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(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)
