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

页码：2602 / 2614

页数：13

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