標題: A NUMERICAL STUDY OF TRANSIENT NATURAL-CONVECTION UNDER TIME-DEPENDENT GRAVITATIONAL ACCELERATION FIELD
作者: FU, WS
SHIEH, WJ
交大名義發表
機械工程學系
National Chiao Tung University
Department of Mechanical Engineering
公開日期: 1-Dec-1991
摘要: A transient natural convection caused by abruptly heating of a vertical wall in a square enclosure which is under time-dependent gravitational acceleration field is studied numerically. During the computing process, a penalty finite element method is adopted to solve the governing equations. The factor of the time-dependent gravitational acceleration is included in Rayleigh number, therefore two variation of Rayleigh number are considered, one is from 10(5) via 10(6) to -10(5) and the other is from 10(4) via 10(5) to -10(4). Since the variations of flow field and temperature distribution of the fluid in the square enclosure are complicated and unpredictable, the isotherms, streamlines and time dependent heat transfer rate are examined for investigating the heat transfer mechanism during the transient process. The results show that the agreement of the heat transfer rate of this study with that of quasi-steady state is mainly dependent on the response of the variation rate of boundary layer along the vertical walls to that of time-dependent gravitational acceleration.
URI: http://dx.doi.org/10.1007/BF01590126
http://hdl.handle.net/11536/3624
ISSN: 0042-9929
DOI: 10.1007/BF01590126
期刊: WARME UND STOFFUBERTRAGUNG-THERMO AND FLUID DYNAMICS
Volume: 27
Issue: 2
起始頁: 109
結束頁: 117
Appears in Collections:Articles