Article
Thermodynamics
Tao Wen, Jielin Luo, Kai Jiao, Lin Lu
Summary: This study investigates the effects of adding four different concentrations of quaternary ammonium cationic surfactants on heat transfer performance during pool boiling. The results show that surfactants significantly enhance the heat transfer coefficient while decreasing the critical heat flux. Surfactants with smaller critical micelle concentrations exhibit higher heat transfer coefficients and lower critical heat fluxes at lower concentrations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Nanoscience & Nanotechnology
Youngsup Song, Chi Wang, Daniel J. Preston, Guanyu Su, Md Mahamudur Rahman, Hyeongyun Cha, Jee Hyun Seong, Bren Philips, Matteo Bucci, Evelyn N. Wang
Summary: This study investigates sandblasting as a scalable surface engineering technique for enhancing pool boiling heat transfer. The results show that surface roughness and volumetric wicking rate increase with the abrasive size, resulting in significant improvements in the critical heat flux and heat transfer coefficient.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Thermodynamics
Hui-Chung Cheng, Ho-Ching Lin, Ping-Hei Chen
Summary: The study investigated the effects of charged surfactants in electrolytic pool boiling on heat transfer performance, finding an optimal current for enhancing the heat transfer coefficient. Analysis of bubble behaviors using high-speed images revealed that using charged surfactants in electrolytic boiling significantly increased the heat transfer coefficient due to the number of bubble nucleation sites and bubble departure frequency.
APPLIED THERMAL ENGINEERING
(2021)
Review
Thermodynamics
Sudhir Kumar Singh, Deepak Sharma
Summary: This paper provides a comprehensive review of the importance of enhancing boiling heat transfer performance and the impact of various surface modification methods on heat transfer effects, proposing key technologies for reducing energy dissipation and improving heat transfer efficiency.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Lukasz J. Orman, Norbert Radek, Jacek Pietraszek, Janusz Wojtkowiak, Marcin Szczepaniak
Summary: The paper discusses the use of laser treatment to improve boiling heat transfer by developing surface features. The impact of pulse duration and scanning velocity on microfins and surface roughness was analyzed. Results showed that the highest microfins and surface roughness were achieved with a pulse duration of 250 ns and scanning velocity of 200 mm/s. The study also examined the influence of macroscopic and microscopic modifications on boiling heat transfer of water and ethanol.
Article
Thermodynamics
Lin Lin, Yanxin Hu, Zipei Su, Minghan Zhu, Jin Huang, Changxiang Fan
Summary: The preparation of micro-nano hybrid structured copper surfaces through sandblasting and ultrasonic wet etching techniques has been investigated for its impact on nucleate pool boiling. The study found that the hybrid structure exhibits improved critical heat flux and heat transfer coefficient compared to smooth and individual micro or nano structured surfaces. The enhancement mechanisms are attributed to the combined effects of roughness, surface area ratio, and wettability.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Vladimir Serdyukov, Sergey Starinskiy, Ivan Malakhov, Alexey Safonov, Anton Surtaev
Summary: Surface modification using laser texturing shows great potential in enhancing heat transfer and increasing critical heat fluxes during pool boiling on metal surfaces. The experiments demonstrate that the laser-textured surface significantly improves heat transfer compared to untreated and polished surfaces. High-speed video recording analysis reveals that laser treatment leads to increased nucleation site density and frequency, as well as reduced bubble departure diameter.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Chanwoo Park, Taegun Kim, Yong-Il Kim, Ali Aldalbahi, Mohammad Rafe Hatshan, Segonpil An, Sam S. Yoon
Summary: Hierarchically structured ZnO nanowires were fabricated via electrospraying and chemical bath deposition for pool boiling applications, showing an enhancement in critical heat flux and effective heat transfer coefficient while promoting efficient boiling process. The study revealed that ZnO nanowires exhibited good surface wettability and the combination of bare and coated surfaces achieved optimal pool boiling conditions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Vladimir Serdyukov, Georgy Patrin, Ivan Malakhov, Anton Surtaev
Summary: This paper investigated the boiling characteristics of water on a biphilic surface under different pressure conditions. It was found that the fabricated biphilic surface exhibited significant heat transfer enhancement at subatmospheric pressures, as well as stabilized the boiling process.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Mu -An Tsai, Liang-Han Chien, Chien-Yeh Hsu
Summary: This research investigates the heat transfer mechanism of helical tubes during saturated pool boiling using experimental measures. R-134a and R-513A were used as working fluids with different saturation temperatures and heat fluxes. The experimental results show that the helical tubes exhibit a tube bundle effect and have higher boiling heat transfer coefficients compared to single straight tubes. The boiling heat transfer coefficients are greatly influenced by the tube pitch and larger, faster-moving bubbles are observed near the upper part of the helical tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Zi-Cheng Hu, Xiao-Yuan Liu, Qian Wang
Summary: In this study, the relationship between surfactant adsorption and bubble behaviors in aqueous surfactant solution under pool boiling conditions was analyzed. Models for surfactant excess adsorption and surface tension were developed and validated with experiments. The results showed that heat flux has a significant influence on excess adsorption and surface tension, especially at high heat flux levels.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Review
Thermodynamics
M. M. Mahmoud, T. G. Karayiannis
Summary: The study focuses on assessing the discrepancies in performance of enhanced surfaces for pool boiling heat transfer, providing insights into understanding the impact of fluid-surface combinations. Challenges in evaluating performance, effects of fluid type, and heat transfer enhancement mechanisms are discussed, with future recommendations for researchers. The paper aims to guide researchers in concluding on the best surface structure and manufacturing technique for specific fluids.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Atul Ranjan, Israr Ahmad, Rinku Kumar Gouda, Manabendra Pathak, Mohd Kaleem Khan
Summary: This study reports the creation of Cu(OH)2 nanoneedles on a copper surface using an anodization process, which can enhance critical heat flux (CHF) limit in pool boiling applications by improving surface wettability and wickability. Results show that the anodized surface requires higher wall superheat for nucleation and exhibits a higher CHF value compared to the plain surface.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Youngsup Song, Shuai Gong, Geoffrey Vaartstra, Evelyn N. Wang
Summary: Boiling is a fundamental process in many applications where surfaces with microcavities or biphilic wettability can enhance heat transfer efficiency. This study investigated microtube structures to simultaneously enhance heat transfer coefficient and critical heat flux, achieving significant improvements compared to smooth surfaces. The combination of micropillars and microtubes further increased critical heat flux by separating nucleating bubbles and rewetting liquids.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Thermodynamics
Siddharth Iyer, Apurv Kumar, Joe Coventry, Wojciech Lipinski
Summary: A mechanistic model is proposed to study the growth of a bubble in pool boiling, considering the change in shape of the bubble as it grows. The model consists of three sub-models for heat transfer, forces acting on the bubble, and the change in shape. The model is validated against experiments and simulations, showing good agreement in the bubble departure time, wall temperature, bubble shape, and microlayer profile.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Dong-Sheng Guo, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li, Ping-Jian Ming, Masamichi Oishi, Marie Oshima
Summary: The study investigates the temperature dependence of surface/interfacial properties of liquids, finding a decreasing trend of surface tension and contact angle with temperature increase. Different dynamic behaviors of droplets are observed for ultra-pure water and surfactant solutions in different stages.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Nuclear Science & Technology
Yue Zeng, Pingjian Ming, Fengchen Li, Hongna Zhang
Summary: In this study, the flow and heat transfer behavior of self-structured spiral cross rod bundles in a lead-bismuth-cooled fast reactor were analyzed using CFD methods. The results showed that the spiral structure had a strong mixing effect, leading to a uniform circumferential distribution of velocity and temperature contours. The Reynolds number had a significant influence on velocity and temperature, while the contribution of heat flux was negligible. Additionally, it was found that the heat transfer characteristics of the fluid flow were affected by the shape of the cross section and the pitch of the spiral cross rod.
ANNALS OF NUCLEAR ENERGY
(2022)
Article
Thermodynamics
Dong-Sheng Guo, Xiao-Bin Li, Si-Ning Li, Hong-Na Zhang, Feng-Chen Li, Ping-Jian Ming
Summary: In this study, the dynamic mechanism of vapor bubble during boiling process under the effect of acoustic field was numerically investigated. It was found that the acoustic field has an influence on bubble behaviors, creating tiny vortices at the root of the bubble and causing one bubble to collapse into two separate bubbles. Furthermore, the acoustic field can break the growing bubbles and promote flow boiling heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Zengkun Zhan, Lixia Chen, Hongna Zhang, Chuandong Lin, Sining Li, Xiaobin Li, Fengchen Li
Summary: This research proposes a new technique for heat transfer enhancement using viscoelastic fluid pulsating laminar flow (VPL flow). Numerical studies and flow performance analysis show that VPL flow significantly improves the overall heat transfer performance, with optimal enhancement achieved at pulsation frequencies close to the characteristic frequency of the viscoelastic fluid flow.
APPLIED THERMAL ENGINEERING
(2022)
Article
Nuclear Science & Technology
Feng-Chen Li, Liang Yao, Ying-Jie Tang, Hong-Na Zhang, Xiao-Bin Li
Summary: This study investigates the reverse flow issue in the PbLi flow of the liquid breeder blanket for magnetically confined fusion reactors and proposes a method to eliminate the reverse flow by regulating the duct dimensions.
FUSION ENGINEERING AND DESIGN
(2022)
Article
Thermodynamics
Dong-Sheng Guo, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li, Ping-Jian Ming
Summary: The dynamic mechanism of vapor bubble removal by acoustic streaming on a downward-facing heating surface during the boiling process was investigated numerically. It was found that longitudinal surface acoustic waves (SAWs) generated vortices at the root of the bubble, promoting its detachment from the heating surface while inhibiting lateral growth and movement. Transverse SAWs produced translational thrust on the bubble, causing it to move laterally and leave the heating surface. When longitudinal and transverse SAWs were superimposed, the vortical flow around the bubble initially excited by the longitudinal SAW was disrupted by the transverse SAW, leading to a shorter lateral detachment time and increased removal speed of the bubble. The results demonstrate that SAW excitation is an effective approach for active control and enhancement of boiling heat transfer on a downward-facing heating surface.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Multidisciplinary
Zhenchao Qi, Zhichao Xu, Fengchen Li, Chenxi Yao
Summary: This study reveals that fast cooling strategy has a detrimental effect on the quality of CF/PEEK holes. To improve the quality, a retarded cooling strategy is proposed to optimize the mechanical properties of the material by controlling the temperature. The experimental results show that the ultimate tensile strength of CF/PEEK holes increases by 23.64% with the use of the retarded cooling strategy. This research is important for enhancing the quality of CF/PEEK holes.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Mechanics
Suming Wang, Wenhua Zhang, Xinyi Wang, Xiaobin Li, Hongna Zhang, Fengchen Li
Summary: This paper conducts direct numerical simulations of viscoelastic drag-reducing turbulence (DRT) to investigate the essence of its maximum drag reduction (MDR) state. The results show that the MDR state can be both inertial turbulence (IT) and elasto-inertial turbulence (EIT), with the dominant dynamics shifting from IT-related to EIT-related dynamics as the maximum extension length (L) of polymers increases. These findings provide insights for breaking through the MDR limit. Rating: 8/10.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Hongna Zhang, Wenhua Zhang, Xinyi Wang, Yansong Li, Xiaobin Li, Fengchen Li
Summary: This study points out that the tensor interpolation method is the main cause of the loss of symmetric positive-definite (SPD) property of the conformation tensor, leading to the high Weissenberg number (Wi) problem (HWNP). Instead of component-based interpolation, a tensor-based interpolation method is proposed, which significantly improves the numerical accuracy and SPD property of the conformation tensor in dealing with the HWNP. Furthermore, high-order total variation diminishing schemes can be easily constructed and applied without artificial diffusion under the proposed framework to solve high-Wi viscoelastic fluid flow.
Article
Thermodynamics
Jun-Li Wang, Wen-Tao Su, Jian Wu, Xiao-Bin Li
Summary: This paper numerically studies the thermo-viscous effect on the sealing characteristics of mechanical seals in reactor coolant pumps (RCPs). The temperature-viscosity equation is introduced based on the physical properties of the sealing medium. The study compares the performance of mechanical seals with two different temperature-viscosity equations and analyzes the influence of thermo-viscous effect on cavitation.
ADVANCES IN MECHANICAL ENGINEERING
(2023)
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)
