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International Heat Transfer Conference 10

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

AN EXPERIMENTAL STUDY OF NATURAL CONVECTION HEAT TRANSFER FROM A HORIZONTAL CYLINDER IN HIGH RAYLEIGH NUMBER LAMINAR AND TURBULENT REGIONS

Shi-Ming Yang
Institllte of Engineering Thermophysics and Energy, Shanghai Jiaotong University, Shanghai, China

Zhi-Zeng Zhang
Shanghai Jiaotong University, Shanghai 200030, China

DOI: 10.1615/IHTC10.3790
pages 185-189

Abstract

In order to elucidate the physical laws for the natural convection heat transfer from a horizontal cylinder in the high Rayleigh number region, special efforts are taken to extend the Rayleigh number range of the experimental data. Data in the turbulent region have been monitored and full coverage of the high Rayleigh number laminar region and the transition region have been realized. The results fail to support either the Morgan's or the McAdams' recommendations on the criterion for transition. Water data reveal that the laminar correlation remains valid for Rayleigh number up to 3.30 × 109. New criteria for transition as well as new heat transfer correlations in the high Rayleigh number regions are proposed.

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