Question

This is a heat transfer question please explain what the answer is and why

The entry region and a fully developed region in internal flow are applicable for laminar and turbulent flow. True or False?

True

False

Answer 1

True.
Explanation:
Entry region and fully developed region exist for Laminar as well as turbulent flow. Irrespective of types of flow when the flow enters pipe, there always exist no slip condition at the pipe wall causing non- uniform flow and growing boundary layer. After some length known as developement length the the velocity profile becomes well defined. In Laminar flow due to large viscous effects the velocity profile is parabolic having maximum at center whereas in turbulent flow the velocity is nearly uniform along the radial direction due to vigorous mixing in lateral directions.