Effect of natural convection on transition to turbulence in vertical pipes

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Abstract

The effect of natural convection on transition to a disturbed flow in a heat transfer section of a vertical pipe has been investigated. The transition is related to the distortions of the velocity profile caused by natural convection. When natural convection is in the direction of forced flow the transition appears to occur through the growth of small disturbances. Transition occurs suddenly when natural convection is opposite the direction of forced flow and it appears to be associated with a separation of the flow at the wall.

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