1. In the analytical derivation of external and internal temperature profiles, we assumed thermal…

1. In the analytical derivation of external and internal
temperature profiles, we assumed thermal properties to be independent of
temperature. Is it then correct to say that in such circumstance the
temperature and the velocity fields are independent?

2. Consider heat convection for laminar flow of water in a
pipe. What is the effect of doubling the flow rate on the Nusselt number? What
is the effect of using motor oil instead of water on h?