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Heat transfer reduction at the separation point on a spinning sphere in mixed convection
Author(s) -
Öztürk Ayşegül,
Ece Mehmet Cem
Publication year - 2002
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.784
Subject(s) - mechanics , laminar flow , stagnation point , heat flux , heat transfer , boundary layer , thermodynamics , isothermal process , natural convection , spinning , convection , materials science , chemistry , physics , composite material
The unsteady laminar thermal boundary‐layer flow over an impulsively started translating and spinning isothermal body of revolution in the case of mixed convection is investigated. Velocity components and temperature are obtained as series of functions in powers of time. The general results are applied to a spinning sphere and the development of the surface heat flux evaluated at the separation point as it advances upstream is determined. The surface heat flux evaluated at the separation point as it moves forward decreases due to the increasing magnitude and influence of the centrifugal force and it is augmented by the opposing flow and reduced by the aiding flow. Reduction of the surface heat flux at the separation point is as low as 50 per cent as compared to the heat flux at the front stagnation point. Copyright © 2002 John Wiley & Sons, Ltd.