Article
Thermodynamics
X. Z. Sun, Q. Li, W. X. Li, Z. X. Wen, B. Liu
Summary: Surface wettability is crucial for pool boiling heat transfer performance. This study focuses on microstructured surfaces with spatially-controlled mixed wettability and investigates their pool boiling performance. The results show that the size of hydrophobic spots on the tops of microstructures has a significant influence on the boiling performance. By optimizing the combined effects of mixed wettability and microstructures, the new microstructured surface outperforms plain surfaces and those with entirely modified wettability. The heat transfer coefficient (HTC) and critical heat flux (CHF) are significantly enhanced.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Environmental
Hanpeng Gao, Siyu Chang, Yan Liu, Zong Meng, Zhiwu Han, Luquan Ren
Summary: By utilizing switchable wettability and reasonable alternating wetting, biomimetic surfaces for manipulating underwater oil droplets were successfully fabricated. These surfaces have cross-contamination resistance, stable wettability, and rewritability, which expand their application field and improve their potential value.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Geng Di Sia, Ming Kwang Tan, Gooi Mee Chen, Yew Mun Hung
Summary: By modifying surface wettability with graphene nanoplatelets, coatings can greatly enhance flow boiling heat transfer, with superhydrophilic coatings showing the best performance. The superhydrophilic coatings facilitate fast water permeation and effective filmwise boiling heat transfer, while hydrophobic and superhydrophobic coatings hinder water intercalation and reduce heat transfer rates.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Yiyi Chen, Rong Fu, Yuying Yan
Summary: This study investigates the improvement of pool boiling heat transfer on grooved surfaces by selectively coating highly hydrophilic or hydrophobic nanoparticles. Three wetting configurations were used, including complete hydrophilicity, hydrophobicity, and 3D heterogeneous wettability. The 3D heterogeneous configuration showed the highest increase in heat transfer coefficient compared to the other two configurations. The combination of hydrophilic grooves and hydrophobic fin tops effectively prevented bubble coalescence at higher heat flux, which couldn't be achieved by complete hydrophilicity alone.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
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
Nanoscience & Nanotechnology
Navid Saneie, Varun Kulkarni, Kamel Fezzaa, Neelesh A. Patankar, Sushant Anand
Summary: Manipulating surface topography is a promising strategy for increasing droplet contact efficiency with superheated surfaces. A study found that the Leidenfrost temperature paradoxically increases as the texture spacing is reduced below a critical value. Despite appearing to boil upon contact, the behavior of droplets on such surfaces is dominated by hydrodynamic instabilities. The comprehensive map of boiling behavior of droplets on textured surfaces has significant implications for applications such as electronics cooling, spray cooling, nuclear reactor safety, and containment of fire calamities.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Thermodynamics
Qing Li, Jiahao Zhao, Xuezhen Sun, Bin Liu
Summary: In this paper, the pool boiling heat transfer on pillar-structured surfaces with different wettability patterns and channel-to-pillar width ratios was experimentally investigated. The results showed that the effect of wettability patterns on boiling performance was similar to that on plain surfaces, but the differences between hydrophilic and hydrophobic patterns increased with the decrease of the channel-to-pillar width ratio.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Jiejin Cai, Ziqi Gong, Bing Tan
Summary: This study investigated the bubble dynamics on vertical surfaces with different wettability through experimental and theoretical analysis. The results showed that the growth and detachment of bubbles were affected by the subcooling degree, even a small difference could significantly impact the bubble volume reduction. When the fluid was saturated or the subcooling was negligible, the bubble tightly adhered to the surface before sliding upwards.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Energy & Fuels
Evgeny A. Chinnov, Sergey Ya Khmel, Victor Yu Vladimirov, Aleksey Safonov, Vitaliy V. Semionov, Kirill A. Emelyanenko, Alexandre M. Emelyanenko, Ludmila B. Boinovich
Summary: Flat surfaces with different patterns of hydrophobic spots were used to study boiling heat transfer. The results showed that heat transfer on biphilic surfaces was significantly higher than on non-biphilic surfaces. Surface texture, shape of hydrophobic regions, and creation method did not have a significant effect on heat transfer. The heat transfer rate depended on the size, distance, and number of hydrophobic spots, with the surface having the largest number of spots showing the highest efficiency. Biphilic surfaces with laser-ablated cavities were the most stable during prolonged contact with boiling water.
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
Chemistry, Multidisciplinary
Qun Cao, Zirui Li, Zheng Cui
Summary: This paper investigates the effect of surface roughness on liquid-vapor phase change heat transfer and its microscopic mechanism using molecular dynamics simulation. The results show that pits on rough surfaces provide stable nucleation sites for bubbles, and as the surface roughness increases, bubble generation, merging, and growth are advanced.
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
Aysenur Ates, Behnam Parizad Benam, Mandana Mohammadilooey, Sueleyman Celik, Vladimir Serdyukov, Anton Surtaev, Abdolali Khalili Sadaghiani, Ali Kosar
Summary: This study investigates the boiling heat transfer performance of surfaces with uniform (superhydrophobic and superhydrophilic) and mixed (superbiphilic) wettability through pool boiling experiments. The experimental results show that the superbiphilic surface can improve boiling heat transfer by 98% and 54% at atmospheric and sub-atmospheric pressures, respectively.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Hongren Zhan, Dongling Liu, Baichen Ji, Debin Liu, Zhigang Zhang
Summary: This paper uses molecular dynamics to study the boiling mechanism of water film explosion and the effect of hybrid wettability concave and convex surfaces on boiling heat transfer. It is found that different wettability surfaces influence the motion behavior of water molecules, leading to different nucleation and boiling speeds of water films. Moreover, surfaces with specific wettability and concave-convex nanostructures can enhance the efficiency of explosive boiling heat transfer.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Youngsup Song, Hyeongyun Cha, Zhen Liu, Jee Hyun Seong, Lenan Zhang, Daniel J. Preston, Evelyn N. Wang
Summary: This study investigates the effect of surface oxidation on the critical heat flux (CHF) values during boiling. It was found that the CHF values on copper surfaces gradually increased with the duration in saturated water, attributed to the formation of Cu2O nanostructures. On the other hand, the CHF values on nickel surfaces remained relatively stable, except when a highly wetting hydroxide, Ni(OH)2, formed after 24 hours of immersion. These findings provide insights into the fundamental mechanisms causing the wide spread of CHF values on metallic surfaces.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Analytical
Po-Yu Chu, Chia-Jung Liao, Chia-Hsun Hsieh, Hung-Ming Wang, Wen-Pin Chou, Ping-Hei Chen, Min-Hsien Wu
SENSORS AND ACTUATORS B-CHEMICAL
(2019)
Article
Engineering, Multidisciplinary
Long-Sheng Kuo, Hsu-Sheng Huang, Te-Hshuan Chen, Sujith C. S. Kumar, Ping-Hei Chen
JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS
(2019)
Article
Materials Science, Multidisciplinary
Ramasamy Anbarasan, Shanmugam Palanikumar, Ayyadurai Anitha Devi, Ping-Hei Chen, Kuo Lun Tung
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
(2019)
Article
Thermodynamics
Sujith C. S. Kumar, Yu Hsuan Chuang, Mario R. Mata Arenales, Albin Joseph, Ping-Hei Chen
HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Hui-Chung Cheng, Te-Hsuan Chen, Hsu-Sheng Huang, Ping-Hei Chen
Summary: This study investigated the thermal performance of ultra-thin heat pipes with a focus on the effect of superhydrophilic wick structures, filling ratio, and sectional lengths. The experimental results showed that superhydrophilic wick structures and a filling ratio of 16.4% resulted in the best thermal performance. Additionally, the variation of sectional lengths impacted thermal resistance and heat transport capacity.
HEAT TRANSFER ENGINEERING
(2021)
Article
Thermodynamics
Mario R. Mata Arenales, Kumar C. S. Sujith, Long-Sheng Kuo, Ping-Hei Chen
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Chemistry, Physical
Hui-Chung Cheng, Zong-Xun Jiang, Tien-Li Chang, Ping-Hei Chen
APPLIED SURFACE SCIENCE
(2020)
Article
Thermodynamics
Hui-Chung Cheng, Tien-Li Chang, Ping-Hei Chen
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Hui-Chung Cheng, Zong-Xun Jiang, Tien-Li Chang, Ping-Hei Chen
Summary: The study found that on copper tubes with different levels of wettability, the heat transfer coefficient of the biphilic surface with hydrophobic patterns increased to 1.16, while that with superhydrophobic patterns decreased to 0.83.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2021)
Article
Thermodynamics
Hui-Chung Cheng, Yu-Ying Chen, Tien-Li Chang, Ping-Hei Chen
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Editorial Material
Engineering, Multidisciplinary
Ping-Hei Chen, Ming-Jyh Chern
JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS
(2021)
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)
Article
Chemistry, Physical
Chin-Chi Hsu, Hui-Chung Cheng, Tien-Li Chang, Ping-Hei Chen
Summary: Experimental results showed that the laser-textured heterogeneous copper surface exhibited higher efficiency in water droplet evaporation, with bubble dynamics playing a significant role in droplet evaporation on heated surfaces.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Thermodynamics
Hui-Chung Cheng, Cheng-Han Li, Tien-Li Chang, Ping-Hei Chen
Summary: This study investigated droplet evaporation on biphilic surfaces and found that the formation of a ring-shaped droplet during the evaporation process enhanced the efficiency of evaporation. The experimental results were compared with the theoretical model proposed in the literature.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Pei-Ching Lin, Hui-Chung Cheng, Ping-Hei Chen
Summary: This study investigated the effects of varying surface wettability on the heat transfer performance of modified copper surfaces in spray cooling. The results showed that higher hydrophilicity led to higher heat transfer performance in the nonboiling regime, while hydrophobic surfaces outperformed plain surfaces in the two-phase regime. Evaporation fraction values were derived and heat transfer prediction models considering surface wettability were established.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2023)
