文献类型：期刊文献

英文题名：Numerical simulation of time-dependent heat and fluid flows inside and around single rising bubbles using a moving axisymmetric boundary-fitted mesh system

作者：Lai, Huanxin[1,2]; Yan, Yuying[3]; Wu, Keqi[4]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Univ Southampton, Thermofluids & Supercond Grp, Sch Engn Sci, Southampton, Hants, England;[3]Univ Nottingham, Sch Built Environm, Nottingham NG7 2RD, England;[4]Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China

年份：2007

卷号：17

期号：4

起止页码：418

外文期刊名：INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW

收录：;EI(收录号：20072210619710);WOS:【SCI-EXPANDED(收录号:WOS:000247257900004)】；

语种：英文

外文关键词：deformation; heat; fluid mechanics; meshes; numerical control; simulation

摘要：Purpose - This paper aims to develop a numerical method for analysing the time-dependent conjugate heat and fluid flows inside and around single bubbles rising in a hot liquid. Design/methodology/approach - The procedure combines the moving mesh method for flows in time-dependent geometries and the zoned calculation algorithm for conjugate viscous flows. A moving axisymmetric boundary-fitted mesh is used to track the deformable gas-liquid interface, while conjugate flows in both gas and liquid sides are calculated by a two-block zoned method. The interfacial stresses are employed to calculate the velocity value and to decide the time-dependent bubble shape simultaneously. Governing equations for the rising velocity and acceleration of the bubble are derived according to the forces acting on the bubble. Findings - A calculating procedure for time-dependent conjugate heat and fluid flows inside and around a rising single bubble has been developed. The algorithm has been verified, and can be employed for further analysing heat, mass and momentum transfer phenomena and their relevant mechanisms. Originality/value - The paper developed a method to obtain high fidelity results for the heat and fluid flow details in the vicinity of a time-dependent moderately deformable rising bubble; the physically zero-thickness of a gas-liquid interface is guaranteed. The governing equations for the time-dependent rising velocity and acceleration are derived.