For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

Question

Accepted Answer

0.794 h1. For laminar flow in a circular tube, the heat transfer coefficient is proportional to the velocity (Nu $\propto$ Re $\propto$ V). Halving the velocity reduces the coefficient by half.