Heat transfer performance and the transition to chaos of mixed convection around an isothermally heated sphere placed in a uniform, downwardly directed flow

被引：8
|
作者：
Koizumi, H. [1 ]
Umemura, Y. [1 ]
Hando, S. [1 ]
Suzuki, K. [1 ]
机构：
[1] Univ Electrocommun, Dept Mech Engn & Intelligent Syst, Tokyo 1828585, Japan
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2010年 / 53卷 / 13-14期
关键词：
Mixed convection; Isothermal sphere; Heat transfer performance; Transition; Chaos; GRASHOF NUMBERS; SMALL REYNOLDS; TURBULENCE;
D O I：
10.1016/j.ijheatmasstransfer.2010.02.057
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
This study aims to reveal the temporal and spatial heat transfer performance and the transition process from a steady axisymmetric separated flow to a chaotic flow of an isothermally heated sphere placed in a uniform, downwardly directed flow by experimentation and transient 3D numerical simulation. Experiments were carried out using air with a Grashof number of 3.3 x 10(5) and with several Reynolds numbers up to 1900. Four types of flow patterns appear showing that the chaotic flow around the sphere is a spatiotemporal chaos by the calculation of a set of Lyapunov exponents from the calculated time series of temperatures. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2602 / 2614
页数：13
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