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Energy and the Environment, 1999

ISSN:
1-56700-127-0 (Print)

FORCED CONVECTION HEATING OF A LIQUID SPHERE IN A GAS STREAM

Mohamed A. Antar
Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia

A. A. Al-Farayedhi
Mechanical Engineering Department King Fahd University of Petroleum and Minerals Dhahran, 31261, Saudi Arabia

Maged A. I. El-Shaarawi
Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia

Abstract

An implicit finite difference scheme was developed to analyze transient thermal boundary layer flow around a liquid sphere moving steadily in an immiscible fluid. Boundary-layer equations are uncoupled at the interface between the gas-phase and the liquid-phase by specifying the boundary conditions. Results obtained at intermediate to high Reynolds numbers (Re) for a wide range of viscosity ratios (μ) show that increasing Re or decreasing μ increases convective heating of the sphere and reduces the time required to attain uniform surface temperature.