Article
Green & Sustainable Science & Technology
Haitao Hu, Yaxin Zhao, Yuhan Li
Summary: This paper reviews the research progress on the flow and heat transfer characteristics of fluids in metal foams and evaluates its potential in energy conservation systems.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Multidisciplinary Sciences
Runping Niu, Xiaoting Jia, Lizhi Geng
Summary: The porosity of hollow fiber membranes has a significant impact on their humidification performance. Increasing the porosity from 0.35 to 0.8 greatly improves the humidification performance, while further increasing it to 0.9 has little effect. It is recommended to control the porosity of hollow fiber membranes between 0.65 and 0.8 for optimal humidification performance.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Multidisciplinary
Wuhuan Gao, Kai Fu, Xianghua Xu, Xingang Liang
Summary: Researchers have developed heat sinks made of copper foam fin microchannels to address cooling challenges. Experimental results show that the heat transfer coefficient of these microchannels is higher and can be further improved at lower heat flux.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Thermodynamics
Mirae Kim, Heesue Jeong, Ahmad Ali Awais, Seungho Kim, Kyung Chun Kim
Summary: The thermal performance of a metal-foam heat exchanger in cryogenic environments was examined through an experiment and a CFD simulation. The results showed good agreement between the experimental data and CFD predictions, indicating that the metal-foam heat exchanger performed well in low-temperature conditions.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Haitao Hu, Zhancheng Lai, Yaxin Zhao
Summary: The study reveals that surface wettability has a significant effect on flow boiling heat transfer coefficient in metal foam filled tubes. Hydrophilic metal foam filled tubes show lower heat transfer coefficient and pressure drop, while hydrophobic tubes exhibit higher values than uncoated ones.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Ali Murat Binark, Mustafa Ozdemir
Summary: This study experimentally investigated the effect of pulsating air flow on heat transfer with constant heat flux applied on a cylindrical duct with metal foam inside. The results showed that the surface and air temperatures were not affected by the flow frequencies in the studied range. Nusselt correlation was established for the fully developed region, and it was found that the effect of frequency on heat transfer in pulsating flow is weak.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Chemistry, Physical
Yaniv Cohen, Siva K. Reddy, Assaf Ya'akobovitz
Summary: The study shows that graphene foam devices have a much higher convective coefficient compared to metals, and exhibit reproducible thermal behavior. This suggests that graphene foam may be a promising material for efficient heat dissipation applications, particularly in areas such as circuits.
Article
Thermodynamics
Huicong Yao, Jie Zhang, Yuehao Li, Hao Liu, Yinfeng Wang, Guiqiang Li, Yuezhao Zhu
Summary: This study investigates the thermal performance and flow stability of a horizontal loop thermosyphon with metal foam. The results show that the addition of metal foam significantly improves the thermal performance and flow stability. This research is of great significance for solar thermal utilization applications.
Article
Thermodynamics
Kai Fu, Wuhuan Gao, Xianghua Xu, Xingang Liang
Summary: This study experimentally investigates the flow boiling phenomenon of water in a copper foam fin microchannel (FFMC) heat sink. The results show that the heat transfer coefficient of the FFMC is improved by 80%, and the pressure drop is increased by 1.2 to 2 times compared to a solid fin microchannel (SFMC) heat sink. Furthermore, the critical heat flux of the FFMC is improved by 25% and the flow instability is significantly mitigated.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
L. Slimani, A. Hamadouche, A. Bousri, H. Ben Hamed
Summary: The aim of this study is to analyze the effects of metal foam and acoustic streaming on heat transfer in forced convection over a heated plate. The results show that both metal foam and ultrasonic waves can improve heat transfer independently. When these two methods are combined, there is a slight increase in heat exchange coefficient.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Nesrine Zahi, Asma Alkabsh, Feriel Bouhjar, Lotfi Derbali
Summary: In this study, a computational model is developed to investigate the fluid flow and heat transfer in a two-dimensional horizontal cylinder filled with an open-cell metal foam block. The results show that the behavior of both hydrodynamics and heat transfer can be controlled by adjusting the porosity, size, and other parameters of the metal foam.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Sheng Huang, Jun Lu, Yongcai Li
Summary: This study investigates the melting performance of a paraffin/copper foam composite phase change material under different inclination angles. The results reveal the complex relationship between natural convection, tilt angle, and melting behavior.
Article
Mechanics
Kangyuan Liu, Xin Li, Jiabing Wang, Kun Yang
Summary: This paper investigates the characteristics of the stress jump coefficient by constructing the real pore structure of metal foam using the Weaire-Phelan model and simulating a complex three-dimensional porous composite system. A novel method to determine the stress jump coefficient is proposed. The results show that the stress jump coefficient varies with the porosity and is independent of the inlet velocity, the rotation number, and the flow pattern.
Article
Thermodynamics
Sanjeev Kumar, Randip Kumar Das, Kishor Kulkarni, Tabish Alam, Sayed M. Eldin
Summary: In this study, a low cost solar air heater (SAH) is designed using numerical simulation and exergy analysis. The thermo-hydraulic behavior of the SAH duct with rib roughness of rectangular and symmetric half NACA 0020 cross-sections is analyzed numerically. Ribs with NACA 0020 cross-section have higher heat transfer and lower flow friction.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Yan Su
Summary: Metal foams with larger interface areas and higher effective conductivities are widely used to increase heat transfer in engineering applications. The study simulated metal foams immersed in a water cooling channel and revealed the quantitative relation between the pore scale and the macroscale convective thermal transport. The results showed that the three-dimensional spirals inside foam pores and behind foam structures are positively related to pore sizes, Reynolds numbers, and the volume fractions of fluid and solid phases, respectively.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Editorial Material
Thermodynamics
Simone Mancin, Kamel Hooman
HEAT TRANSFER ENGINEERING
(2021)
Article
Thermodynamics
Alexandra Gimeno-Furio, Leonor Hernandez, Simona Barison, Filippo Agresti, Gregorio Bottaro, David Cabaleiro, Luca Doretti, Simone Mancin
Summary: This study focuses on the wettability properties of oxidized carbon nanohorn water based nanofluids on different metal surfaces and their novel application in depositing an ultra-thin layer using pool boiling. The results show the stable nature of the coating and its slight impact on the wettability of the nanofluids. Additionally, the solar reflectance of the coated aluminum sample was found to be significantly lower compared to a reference aluminum surface.
HEAT TRANSFER ENGINEERING
(2021)
Article
Thermodynamics
Chunrong Zhao, Michael Opolot, Ming Liu, Frank Bruno, Simone Mancin, Ross Flewell-Smith, Kamel Hooman
Summary: The idea of embedding highly thermally conductive wire nets with periodic structures into phase change materials to improve their thermal conductivity has been proposed. Numerical simulations have shown that critical cell size, cell height, and interface gap thickness all play a role in heat transfer within the PCM. Different metal materials such as copper and stainless steel have different critical pores per inch (PPI), and shorter cell heights with lower porosities can shorten melting times.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Michele Calati, Luca Doretti, Claudio Zilio, Simone Mancin
Summary: This study presents a numerical simulation of a ventilated roof using a novel plastic support to reduce solar heat gains by improving airflow distribution. The innovative ventilated roof led to a significant reduction (up to 70%) of total solar heat gains compared to traditional roofs in all simulated scenarios.
SCIENCE AND TECHNOLOGY FOR THE BUILT ENVIRONMENT
(2021)
Article
Thermodynamics
Giulia Righetti, Claudio Zilio, Luca Doretti, Giovanni A. Longo, Simone Mancin
Summary: The thermal conductivity of Phase Change Materials has a significant impact on the performance of passive electronic thermal management systems, with the effectiveness of enhanced heat transfer surfaces depending on operating conditions. It is important to consider the properties of the Phase Change Material, system requirements, and real operating conditions when designing such systems.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
M. Calati, G. Righetti, L. Doretti, C. Zilio, G. A. Longo, K. Hooman, S. Mancin
Summary: Metal foams show promising capabilities in enhancing water pool boiling heat transfer, with the ability to significantly improve boiling heat transfer due to an earlier onset of nucleate boiling. The developed artificial neural network tool can successfully predict the complexity of water pool boiling inside metal foams.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
G. Righetti, G. A. Longo, S. Mancin, C. Zilio
Summary: This manuscript presents an experimental study on heat transfer and pressure drop of two aluminum lattice-frame materials obtained via additive manufacturing. The results show that by varying the air flow rate and the electrical power, the pressure drop can be reduced while maintaining almost constant heat transfer coefficient. It is also found that the airfoil shaped sample can maintain the same junction temperature by lowering the pumping power.
EXPERIMENTAL HEAT TRANSFER
(2023)
Article
Thermodynamics
Marco Noro, Claudio Zilio
Summary: This article translates the recommendations of the World Health Organization for controlling the airborne spread of the COVID-19 virus in schools and compares different technical solutions. The results show that the combined heat pump and total heat recovery system is the most efficient solution, especially for older schools. The economic analysis reveals that using only the heat pump is the preferable solution.
SCIENCE AND TECHNOLOGY FOR THE BUILT ENVIRONMENT
(2022)
Article
Thermodynamics
Andrea Diani, Carlo Nonino, Luisa Rossetto
Summary: This study investigates the solid-liquid phase change process of three paraffin waxes with different melting temperatures embedded in aluminium structures. Experimental and numerical results show the effects of heat flux, melting temperature, and metal structure size on the heated surface temperature. The study also presents a simplified numerical model that can be used to design PCM-based heat sinks for electronics cooling.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Andrea Diani, Yuce Liu, Jian Wen, Luisa Rossetto
Summary: This study experimentally investigated the flow condensation of R1234ze(E), R450A, and R515B in a micro-fin tube. The heat transfer coefficients and frictional pressure gradients of the three refrigerants were compared, and models were selected to explore their feasibility for the new refrigerants and tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Giovanni A. Longo, Simone Mancin, Giulia Righetti, Claudio Zilio
Summary: This paper presents the local heat transfer coefficients of R32 and R410A complete condensation inside a Brazed Plate Heat Exchanger (BPHE). Experimental data was compared against theoretical models, and the results showed good agreement with both gravity controlled condensation and forced convection condensation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Giovanni A. Longo, Simone Mancin, Giulia Righetti, Claudio Zilio
Summary: This paper presents the measurement of liquid phase density, thermal diffusivity, thermal conductivity, and dynamic viscosity of five commercial PCM in the temperature range of 2-30 degrees Celsius. The results show that the performance of these PCM is significantly lower than water in many aspects.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2022)
Article
Chemistry, Multidisciplinary
Yuce Liu, Luisa Rossetto, Andrea Diani
Summary: A comparative analysis was conducted on the flow boiling characteristics of R450A, R515B, and R1234ze(E) inside a microfin tube. The study found that R515B and R1234ze(E) had similar heat transfer coefficients and pressure gradients under all tested conditions, while R450A had lower heat transfer coefficients, especially at low heat flux and high mass velocity. However, the heat transfer performance gap between the three fluids reduced at high heat flux. R450A also exhibited lower frictional pressure drops compared to the other two fluids.
APPLIED SCIENCES-BASEL
(2022)
Article
Energy & Fuels
Luisa Rossetto, Andrea Diani
Summary: This paper reviews the research on the use of microfin tubes in heat exchangers to enhance heat transfer. It presents new experimental friction factors for the flow of superheated vapor in a microfin tube. The authors also collected a large data bank of heat transfer coefficients and friction factors for different geometries of inner finned tubes. The suggested models for friction factor and heat transfer coefficient predictions show good agreement with the experimental data.
Review
Energy & Fuels
Assunta Andreozzi, Pietro Asinari, Antonio Barletta, Vincenzo Bianco, Johan Augusto Bocanegra, Pedro Vayssiere Brandao, Bernardo Buonomo, Roberta Cappabianca, Michele Celli, Eliodoro Chiavazzo, Paolo De Angelis, Andrea Diani, Sauro Filippeschi, Marcello Iasiello, Oronzio Manca, Sergio Nardini, Carlo Nonino, Luisa Rossetto
Summary: In the past decade, innovative methods for the design of heating, cooling, and heat storage devices have focused on the use of nanofluids, metal foams, and phase change materials (PCMs). A network of nine Italian universities has achieved significant results by collaboratively researching and evaluating the enhancement in heat transfer and thermal performance through the combined use of these materials.
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)
