Pore-scale simulation on pool boiling heat transfer and bubble dynamics in open-cell metal foam by lattice boltzmann method

被引：0

作者：

Qin, Jie ^{[1
]}

Xu, Zhiguo ^{[1
]}

Ma, Xiaofei ^{[2
]}

机构：

[1] School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai,200240, China

[2] CAST-Xi'an Institute of Space Radio Technology, Xi'an,710100, China

来源：

Journal of Heat Transfer | 2021年 / 143卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Bubble entrainment - Geometrical modeling - Lattice Boltzmann method - Lattice boltzmann methods (LBM) - Open-cell metal foams - Pool boiling heat transfer - Pore-scale simulation - Surface tension force;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Based on the newly developed geometrical model of open-cell metal foam, pool boiling heat transfer in open-cell metal foam, considering thermal responses of foam skeletons, is investigated by the phase-change lattice Boltzmann method (LBM). Pool boiling patterns are obtained at different heat fluxes. The effects of pore density and foam thickness on bubble dynamics and pool boiling heat transfer are revealed. The results show that bubble entrainmentpromotes fluid mixing and bubble sliding inside metal foam. Based on force analysis, the sliding bubble is pinned on the heating surface and cannot lift off completely at high heat flux due to the increasing surface tension force. Pool boiling heat transfer coefficient decreases with increasing pore density and foam thickness due to high bubble escaping resistance. Copyright © 2021 by ASME.

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