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International Journal of Fluid Mechanics Research

ISSN Print: 1064-2277
ISSN Online: 2152-5102

International Journal of Fluid Mechanics Research


pages 482-495

A Unified Correlation of Laminar Convective Heat Transfer from Hot and Cold Circular Cylinders in a Uniform Flow

Shin-Hyung Kang
School of Mechanical and Aerospace Engineering, Seoul National University Seoul, Korea
K.-H. Hong
Department of Mechanical Engineering, Seoul National University Seoul, Korea
Sangken Kauh
Department of Mechanical Engineering, Seoul National University Seoul, Korea

ABSTRACT

Effects of variable properties of fluid on the heat transfer between a circular cylinder and the external uniform flow were numerically investigated in the present study. The flow and temperature fields were solved using a Finite Volume Method for the uniform flow and wall temperatures. The cold as well as hot cylinders in the uniform flow of constant temperature were investigated. Heat transfer coefficient on a cylinder in a uniform flow increases as the wall temperature increases. However, it decreases as the free stream temperature increases for a cylinder of constant temperature. The variation of heat transfer rate with temperatures depends on the variation of viscosity, boundary layer thickness, temperature gradient and conductivity over the wall. Heat transfer rate is strongly influenced by the variation of conductivity over the wall. A unified correlation was obtained in the present study using the ratio of wall and free stream temperatures to take into account the variation of properties. The correlation is valid for both hot and cold cylinders in a uniform stream.