Article
Instruments & Instrumentation
Yang Li, Hong-Wei Chen, Fu-Qiang Wang, Xin-Lin Xia, He-Ping Tan
Summary: The radiative properties of semitransparent ceramic struts are found to be different from dense ceramic bulks, with a lower extinction coefficient. There is a slight difference in scattering albedo, and the extinction coefficients and scattering albedos can be used as a function of wavelengths in potential applications.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Instruments & Instrumentation
Jia-Qi Li, Xin-Lin Xia, You-Wei Yang, Jian Qiu, Xue Chen
Summary: A pore scale model was established to investigate the high-temperature radiative properties of carbon foams with high porosity. Numerical simulation showed high precision in comparison with measured data at room temperature. Spectral radiative properties and bidirectional reflectance distribution function were studied, emphasizing the dominance of absorptance in the apparent radiative behaviors of carbon foams at high temperatures.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Thermodynamics
Bo Liu, Xin-Lin Xia, Xue Chen, Ming Ma
Summary: The presented method integrates the microscopic morphology of ligament surface and macroscopic solid ligament network for the prediction of radiative properties of open-cell metal foam. It is applied for calculating the spectral radiative properties of nickel foams and validated by comparing with experimental results, while also discussing the effects on the radiative properties caused by incident wavelength and angle.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Yang Li, Hong-Wei Chen, Xin-Lin Xia, Gui-Yang Ma, He-Ping Tan
Summary: This study proposed a method to determine the radiative properties of solid struts by identifying pore scale from macro scale measurements. The results showed that the average reflectivity of nickel struts is 12% lower than that of a nickel mirror, and the proportion of specular reflection at nickel strut surface increases with wavelengths.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Review
Materials Science, Multidisciplinary
Tan Wan, Yuan Liu, Canxu Zhou, Xiang Chen, Yanxiang Li
Summary: Open-cell metallic foams, such as aluminum foam, have excellent structural performance and functional characteristics like light weight, energy absorption, and electromagnetic shielding. This new engineering material is widely used in aerospace, automotive industry, and other fields. This paper provides a summary of the fabrication methods, properties, and applications of open-cell aluminum foams, as well as the current status and development trends.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Instruments & Instrumentation
Xin-Lin Xia, Bo Liu, Xue Chen, Chuang Sun
Summary: In this study, a new trans-scale analysis method is proposed to accurately predict the spectral radiative properties of open-cell ceramic foams by combining the complete structure model consisting of microscopic ligament morphology and pore-level structure. The characteristic models of microscopic ligament morphologies are obtained using SEM technique and the network structure of ligaments is reconstructed using mu-CT technique. The FDTD method is employed to analyze the spectral radiative transfer behaviors on the surfaces and inside the ligament media based on the statistical models developed from the SEM data. The presented trans-scale analysis method predicts the apparent spectral absorptivity and reflectivity, as well as the equivalent volumetric spectral radiative properties of alumina foam sheets.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Thermodynamics
Jia-Qi Li, Xin-Lin Xia, Chuang Sun, Xue Chen
Summary: This study aims to predict the infrared radiative properties of nickel foam ligaments at high temperatures numerically. The results show that high temperature can marginally strengthen radiation scattering of the ligament surfaces, while having little effect on the distribution of radiation scattering. The study demonstrates a practical method for obtaining the infrared radiative properties of open-cell metal foam ligaments at high temperatures.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Polymer Science
Yawei Shi, Aijun Hu, Zhiyuan Wang, Kedi Li, Shiyong Yang
Summary: Closed-cell rigid polyimide foams with excellent thermal stability and combined properties were prepared by thermal foaming of a reactive end-capped polyimide precursor powder in a closed mold, showing outstanding thermal stability and compression creep deformation resistance.
Article
Optics
Minsin Kim, Mirae Kim, Sajjad Hosseini, Jihwan Jeong, Kyung Chun Kim
Summary: Metal foam structures have theoretical advantages in various applications, and understanding their flow characteristics is crucial for their utilization in thermal-fluid systems. Experimental observations show that the turbulent flow characteristics inside metal foam are similar regardless of Reynolds number, with increased velocity and temporal fluctuations compared to laminar inlet conditions.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Ashutosh Pandey, Ruchi Dubey, Hemant Jain, Amit Abhas, Rajeev Kumar, G. K. Gupta, S. Siram, V. Chilla, D. P. Mondal
Summary: Fully open interconnected Al-foam with different PPI was fabricated through a novel template method. The method allows easy tailoring of the foam's morphology and shows the effects of different PPIs on its microstructure and properties. By changing the PPI, one can easily customize the foam's porosity, density, and other properties. This study provides useful information for fabricating open-cell aluminium foam with desired thermal, electrical, and mechanical properties.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Environmental
Stefano E. Zanco, Matteo Ambrosetti, Gianpiero Groppi, Enrico Tronconi, Marco Mazzotti
Summary: Experimental and modeling analysis shows that using packed open-cell foams as an alternative to standard packed bed configuration can achieve faster temperature transitions and reduce temperature gradients within the adsorption bed. Even though there is a loss of sorbent inventory with the presence of foam, higher process productivity is achieved due to faster temperature swings and more homogeneous temperature distribution within the adsorption columns.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Applied
Lin Chen, Nan Hu, Chunquan Zhao, Xiaodan Sun, Rong Han, Yanyan Lv, Zhijun Zhang
Summary: This study developed a surfactant-free active Al2O3 nanoparticle (ANP) modified with adipic acid (AA) as a collector and frother for efficient recovery of anthocyanin (ACN) from perilla leaves. The ANP-AA had a high collection capacity for ACN and formed a stable foam layer at the gas-liquid interface. Under appropriate conditions, ACN recovery of 95.68% with an enrichment ratio of 29.87 was achieved. The recovered ACN also exhibited promising antioxidant properties, highlighting the significance of these findings in the food, colorant, and pharmaceutical industries.
Article
Materials Science, Multidisciplinary
Anja Mauko, Mustafa Sarikaya, Mustafa Guden, Isabel Duarte, Matej Borovinsek, Matej Vesenjak, Zoran Ren
Summary: This study investigated the high-strain rate mechanical properties of open-cell aluminium foam M-pore (R). The results showed that the foam's behavior is strongly dependent on the loading rate, with changes in plateau stress and deformation front formation and propagation. X-ray micro-computed tomography (mCT) was used to analyze the internal structure of the specimens. Numerical models were built and computational simulations were conducted to simulate the mechanical response of the foam under different loading rates. The agreement between the experimental and computational results was good.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Siavash Sarrafan, Guoqiang Li
Summary: Here, the first hybrid open-cell foam with revisable actuation is reported. The study presents a novel concept of creating hybrid two-way shape memory open-cell foams using shape-memory-polymer-based syntactic foams as the matrix. The resulting hybrid foam exhibits attractive properties including reversible actuation strain, low density, high thermal stability, and multiple functionalities, enabling potential applications in adjustable filters, insulators, sealers, and smart scaffolds.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Mechanical
Hossein Salimi, Mohsen Hajizadeh, Mohammad Reza Kalhori, Sina Jalili, Mojtaba Yazdani
Summary: Metal foam materials have lower resistance to cyclic loads than their base bulk materials, but they exhibit good fatigue loading capacity within a certain stress range.
INTERNATIONAL JOURNAL OF FATIGUE
(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)