Using the Ghost Fluid Method for sharp interface representation, the complete single bubble pool boiling process including the transient thermal response of the solid wall is simulated numerically. Two level set functions are used for capturing the liquid-vapor-solid interfaces. Bubble dynamics and local heat transfer influenced by thickness and material parameters of the solid wall are analyzed at constant temperature on its bottom. For the same material and the same bottom temperature, growth time and departure diameter of bubble change slightly with the thickness. A clear local low-temperature region is produced inside the wall under the bubble base, which expands and recedes periodically with the movement of the three phase contact line. The movement of the local low-temperature region lags gradually comparing to that of the contact line with increasing thermal diffusivity of solid walls. Waiting time increases with decreasing thermal diffusivity of solid walls, resulting in thickened thermal boundary layer at nucleation, and then short bubble growth time and large departure diameter. (C) 2014 Elsevier Ltd. All rights reserved.
The present study is supported financially by the National Natural Science Foundation of China under the grants of 11372327 and 10972225, and the Strategic Priority Research Program on Space Science, the Chinese Academy of Sciences under the grants of XDA04020404 and XDA04020202-04. The authors also appreciate Prof. Li Yuan (Academy of Mathematics and Systems Science, CAS), and Prof. Zai-Sha Mao (Institute of Process Engineering, CAS) for fruitful discussions.
[Zhang, Liang; Li, Zhen-Dong; Li, Kai; Zhao, Jian-Fu] Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Nat Micrograv Lab, Beijing 100190, Peoples R China; [Li, Hui-Xiong] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Peoples R China; [Zhang, Liang] SNPSDC, Beijing 102209, Peoples R China