Heat transfer reduction at the separation point on a spinning sphere in mixed convection

✍ Scribed by Ayşegül Öztürk; Mehmet Cem Ece

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 124 KB
• Volume: 26
• Category: Article
• ISSN: 0363-907X
• DOI: 10.1002/er.784

✦ Synopsis

The unsteady laminar thermal boundary-layer #ow 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 #ux evaluated at the separation point as it advances upstream is determined. The surface heat #ux evaluated at the separation point as it moves forward decreases due to the increasing magnitude and in#uence of the centrifugal force and it is augmented by the opposing #ow and reduced by the aiding #ow. Reduction of the surface heat #ux at the separation point is as low as 50 per cent as compared to the heat #ux at the front stagnation point.