Local heat transfer coefficient measurement in rotating cooling channel

Krishnamoorthy, V and Sashidar, K and Pai, BR (1997) Local heat transfer coefficient measurement in rotating cooling channel. In: 13th ISABE - International Symposium on Air Breathing Engines, 7-12 sep 1997, Chattanooga, United States.

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Abstract

Experimental investigations were undertaken to identify the effect of the secondary flow driven by Coriolis force on heat transfer in a rotating cooling channel. Experiments were carried out using a square channel simulating sudden entry condition. The Reynolds number was varied in the range of 6,500-14,000, with the rotation number in the range 0-0.33. The heat transfer coefficient was obtained using a transient technique from the temperature response of cylindrical copper plugs embedded in the channel walls. Due to the low thermal conductivity of the wall material, the wall temperature follows the freestream temperature closely, resulting in small buoyancy effects. The results indicate a large reduction in the heat transfer coefficient on the leading surface and a small increase on the trailing surface. The change observed in the developing flow region and the developed flow region was different. On both surfaces a reduction in heat transfer coefficient was observed at rotation number less than 0.06. The results indicate that the heat transfer coefficient on the leading surface may be reduced by as much as 50 percent of stationary channel value.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Heat transfer;Rotating cooling channel
Subjects: ASTRONAUTICS > Spacecraft Design, Testing and Performance
Division/Department: Propulsion Division, Propulsion Division, Propulsion Division
Depositing User: M/S ICAST NAL
Date Deposited: 19 Sep 2006
Last Modified: 24 May 2010 09:50
URI: http://nal-ir.nal.res.in/id/eprint/2756

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