Article
Thermodynamics
Hong-Xia Chen, Lin-Han Li, Yi-Ran Wang, Yu-Xiang Guo
Summary: This study demonstrates through numerical simulations that a conceptual design of microstructured surfaces with time-varying wettability can enhance boiling heat transfer performance by reducing adhesion force on bubbles, increasing bubble departure frequency, forming thin liquid films to suppress dry spots, and increasing total evaporation rate. By modulating the wettability of the surface, the heat transfer efficiency can be significantly improved.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
W. X. Li, Q. Li, Y. Yu, Kai H. Luo
Summary: This study introduces a novel pillar-structured surface for enhancing nucleate boiling heat transfer and categorizes the bubble dynamics into three regimes on this surface with distributed wettability-modified regions. Among these regimes, regime II demonstrates the best boiling performance due to the synergistic effects of surface structure and mixed wettability, leading to elongated triple-phase contact lines on the pillar top and reduced dry spot area. The study also shows that the optimal boiling performance is consistently observed in cases falling within regime II.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Omid Ejtehadi, Ali Sadeghi, Byoung Jae Kim
Summary: In this study, an Eulerian-Eulerian two-fluid approach was used to simulate nucleate boiling in a vertical rolling 2 x 2 rod bundle with a tilted axis. The effects of oscillation on boiling and the physics of the fluids inside the rod bundle were analyzed using high-performance computing. The study investigated the effect of a tilted rolling axis for the first time and found that it affects the void fraction and heat transfer coefficient, with a higher tilt resulting in greater variation in the maximum field values. The results contribute to our understanding of wall nucleate boiling, important for the design and safety of light water-cooled reactors (LWR).
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Sudhir Kumar Singh, Deepak Sharma, Akshay Kumar Singh
Summary: Surface modification through pool boiling of nanofluid is an efficient technique in delaying critical heat flux and attaining high heat flux at lower wall superheat temperature. The present study numerically investigates the nucleate pool boiling of SiO2/water and Al2O3/water nanofluids and studies the effects of wall superheat temperature and heat flux on active nucleation site density, bubble departure diameter, and bubble waiting time. The study also investigates the effects of heater surface material and nanofluid concentration on wall superheat temperature and heat transfer coefficient.
HEAT TRANSFER ENGINEERING
(2023)
Article
Thermodynamics
Prabhu Alphonse, Karthikeyan Muthukumarasamy, Ratchagaraja Dhairiyasamy
Summary: This study evaluates the performance of using a silver nanofluid as a coolant in a heat exchanger. It finds that the fluid flow rate has the most significant influence on effectiveness. Although the silver nanofluid shows better effectiveness compared to water, the cost of production and characterization of silver nanoparticles is not justified.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Mechanics
Prasad Kangude, Atul Srivastava
Summary: This study investigates the mechanisms of nanoparticle deposition during nucleate pool boiling on plain hydrophobic surfaces through experiments and infrared thermography, revealing the orderly pattern of nanoparticle deposition and its impact on heat transfer coefficient.
Article
Thermodynamics
Linsong Gao, Minli Bai, Jizu Lv, Yang Li, Yunjie Yang, Xuecheng Lv, Xuanyu Liu, Yubai Li
Summary: Micro-cavities surfaces with different wettability were prepared using nanosecond laser micro-nano processing technology, chemical oxidation, and electrochemical corrosion. The effects of microcavities and surface wettability on evaporation time and bubble dynamics were experimentally investigated. The results showed that micro-cavities surfaces with smooth structures exhibited excellent evaporation performance, while surfaces with CuO film and superhydrophobic structures hindered the evaporation process. The Rayleigh-Taylor instability was easily triggered on microcavities surfaces with superhydrophobic structures, prolonging the evaporation process. Entrapped air inside the micro-cavities served as the bubble seed, shortening the time for bubble nucleation.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Asem Albaser, Tze Cheng Kueh, Gooi Mee Chen, Geng Di Sia, Yew Mun Hung
Summary: The study investigates the effects of Silver Epoxy reinforcement on the adhesive strength of Graphene nanoplatelets (GNP) on the substrate. The results show that the Silver Epoxy reinforced GNP functionalized surface significantly enhances the heat transfer of pool boiling. Under a heat flux of 550 kW/m2, the heat transfer coefficient improves by 194%, 36%, and 77% respectively on pristine GNP, uncured GNP/Epoxy, and cured GNP/Epoxy compared to the bare copper surface. However, the epoxy reinforcement weakens the boiling heat transfer enhancement achieved by the GNP functionalized surface.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Mojtaba Edalatpour, Camryn L. Colon, Jonathan B. Boreyko
Summary: By using ice pellets instead of water droplets, nucleate boiling can be maintained up to 500 ℃, as the tandem phase-change processes at the solid-liquid and liquid-vapor interfaces dampen the rate of vapor generation.
Article
Thermodynamics
Yi Shen Lim, Yew Mun Hung
Summary: The use of graphene-nanoplatelets coated surface enhances boiling efficiency, prolonging the lifespan of light-emitting diodes through various anomalous effects.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
M. Esawy, Amir Hossein Nikoo, M. Reza Malayeri
Summary: The superiority of enhanced boiling on structured heat transfer surfaces is due to excessive bubble generation and behavior as well as the latent heat of evaporation. While these factors lead to higher heat transfer coefficients, they also accelerate fouling for aqueous solutions with inverse solubility. The study finds that Turbo-B tubes demonstrate better anti-fouling behavior compared to plain tubes and low finned tubes.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Sayantan Mukherjee, Purna Chandra Mishra, Paritosh Chaudhuri
Summary: The experimental investigation showed significant improvements in boiling heat transfer coefficient and critical heat flux at a mass fraction of 0.1% for Al2O3 and TiO2 nanoparticles in water. An increase in mass fraction improved the surface wettability of nanofluids and reduced the surface roughness of the boiling surface. Al2O3-water nanofluids exhibited better boiling performance compared to TiO2-water nanofluids.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Yakang Xia, Xuan Gao, Ri Li
Summary: Smooth and laser-ablated silicon surfaces with different wettability were tested in subcooled pool boiling of water. The experiment focused on observing bubble phenomena and measuring surface temperature. It was found that the formation and departure of vapor bubbles varied significantly with the surface wettability. Nucleate boiling curves showed that both the heat transfer coefficient and critical heat flux increased with increasing surface wettability changing from super-hydrophobic to super-hydrophilic. The effect of surface wettability on heat transfer was quantitatively assessed using the surface-fluid factor, which increased with increasing surface wettability. The influence of surface wettability on heat transfer differed between hydrophilic and hydrophobic surfaces.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Longyan Zhang, Jinliang Xu
Summary: The study employed molecular dynamics to investigate phase changes of thin liquid films on nanostructured surfaces with hybrid wettability. Results show that the original residual vapor nuclei facilitate the mechanism of nucleate boiling, and competition mechanism between liquid film and nanostructure was identified. Hydrophobic nanocavities induce a piston-like effect, reducing the waiting time for bubble nucleation and being more effective in bubble generation compared to hydrophilic nanocavities.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Thermodynamics
Borui Zhang, Jin Wang, Yanwei Hu, Yurong He
Summary: Droplet evaporation plays a crucial role in industrial and agricultural production as well as natural meteorological processes. Wettability and wall temperature are key factors influencing evaporation. Higher wall temperatures accelerate evaporation, but can also lead to instability. Hydrophilic surfaces exhibit higher evaporation rates compared to hydrophobic ones, which are more prone to nucleate boiling.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2023)
Review
Construction & Building Technology
Yihuan Yan, Xiangdong Li, Jiyuan Tu
INDOOR AND BUILT ENVIRONMENT
(2017)
Article
Thermodynamics
Yihuan Yan, Xiangdong Li, Jiyuan Tu
BUILDING SIMULATION
(2017)
Article
Construction & Building Technology
Yaming Fan, Xiangdong Li, Yihuan Yan, Jiyuan Tu
ENERGY AND BUILDINGS
(2017)
Article
Construction & Building Technology
Lin Yang, Mengxi Li, Xiangdong Li, Jiyuan Tu
INTERNATIONAL JOURNAL OF VENTILATION
(2018)
Article
Thermodynamics
Wenxin Li, Xiangdong Li, Yuanling Peng, Yong Wang, Jiyuan Tu
APPLIED THERMAL ENGINEERING
(2018)
Article
Construction & Building Technology
Xiangdong Li, Yidan Shang, Yihuan Yan, Lin Yang, Jiyuan Tu
BUILDING AND ENVIRONMENT
(2018)
Article
Construction & Building Technology
Wenxin Li, Xiangdong Li, Yong Wang, Jiyuan Tu
ENERGY AND BUILDINGS
(2018)
Review
Thermodynamics
Yang Yuan, Xiangdong Li, Jiyuan Tu
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Construction & Building Technology
Xiangdong Li, Yihuan Yan, Jiyuan Tu
BUILDING AND ENVIRONMENT
(2018)
Article
Construction & Building Technology
Yihuan Yan, Xiangdong Li, Jiyuan Tu
BUILDING AND ENVIRONMENT
(2019)
Article
Energy & Fuels
Wenxin Li, Xiangdong Li, Ruiqing Du, Yong Wang, Jiyuan Tu
Article
Construction & Building Technology
Xiangdong Li, Jiyuan Tu
ENERGY AND BUILDINGS
(2019)
Article
Thermodynamics
Xiangdong Li, Yihuan Yan, Jiyuan Tu
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Energy & Fuels
S. J. Chen, Z. C. Tao, Y. Fu, M. Zhu, W. L. Li, X. D. Li
Article
Construction & Building Technology
Yihuan Yan, Xiangdong Li, Yidan Shang, Jiyuan Tu
BUILDING AND ENVIRONMENT
(2017)
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)
