Доступ предоставлен для: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan
Gain Access(open in a new tab)
Приобрести $25.00(open in a new tab) Check subscription(open in a new tab) Этичность и качество публикуемых материаловIt's a pdf file. (open in a new tab) Рекомендовать моей библиотеке(open in a dialog) Добавить в закладки

Enhanced Transient Pool Boiling of Water on Nanoscale Textured Superhydrophilic Surfaces

Get access (open in a dialog) DOI: 10.1615/IHTC15.pbl.008964
pages 6359-6366
Li-Wu Fan
Institute of Thermal Science and Power Systems, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China; State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Jia-Qi Li
Thermal Science Research Laboratory, Institute of Thermal Science and Power Systems, Zhejiang University, Hangzhou 310027, China; Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Dan-Yang Li
Thermal Science Research Laboratory, Institute of Thermal Science and Power Systems, Zhejiang University
Liang Zhang
Institute of Thermal Science and Power Systems, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China; Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611-6250, USA; State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Zi-Tao Yu
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611-6250, USA
Ya-Cai Hu
Thermal Science Research Laboratory, Institute of Thermal Science and Power Systems, Zhejiang University,

Аннотация

The effects of surface superhydrophilicity on transient pool boiling of water under atmospheric pressure were experimentally examined by means of the quenching method with hot stainless steel spheres. As a baseline case for comparison, the original clean surfaces were determined to have an apparent static contact angle of approximately 23???? that was considered hydrophilic. The superhydrophilic surfaces were prepared by coating the original surfaces with a nanoscale textured layer that further lowers the surface wettability to nearly 0????. The results showed that boiling heat transfer for the superhydrophilic case is enhanced for all the boiling regimes during quenching, as compared to the original hydrophilic case. The critical heat flux was found to improve by 66%. With the aid of high-speed imaging, the absence of a stable vapor film, accompanied by violent rewetting of the superhydrophilic surfaces, was attributed to such great boiling heat transfer enhancement.
Ключевые слова: Boiling, Multiphase, Nano/Micro, Wettability, Hydropholicity, Superhydrophilicity