Chapter 8: Internal Forced Convection
Chapter 8: Internal Forced Convection
Chapter 8: Internal Forced Convection
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• Consider a ring-shapeddifferential volume element.• A force balance on the volumeelement in the flow directiongives( 2 πrdrP) − ( 2 πrdrP)x+( πrdxτ) ( πrdxτ)x dx+ 2 − 2 = 0rr+dr(8-34)• Dividing by 2π dr dx and rearrangingrP( ) ( )x dxP rτrτ+−−x r+ dr rdx+ =dr0(8-35)