The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is __________ compared to the same size pipes without fins.

Question

Quizplus · Accepted Answer

The equivalent diameter for the annulus is less when fins are added to the inner pipe because the fins reduce the flow area available for the fluid in the annulus, effectively decreasing the hydraulic diameter.

The Equivalent Diameter for the Annulus of a Double Pipe