Q11) For radial system (cylinder) with one dimension, steady state, no heat generation. Determine the heat flow through the cylinder. Note that the inner radius of cylinder (r) and the outer radius is ( ro) with length (L). Q12) Derive an expression for the overall heat transfer coefficient (U) for one layer plane with convection heat transfer from both sides?

A spherical container having an outer radius r2 and inner radius r1 (with thermal conductivity, k) is filled with radioactive material generating constant heat at a rate of qdot. Fluid flows across the container at Tinfinity and convection coefficient h. Obtain a relation for the variation of temperature through the spherical container assuming steady state.

solution-correct

The thermal boundary layer in heat transfer exists whenever there is a difference between the temperatures of the fluid and the outside environment. For fluid flow, how does a boundary layer form?A. Because common surfaces are not smooth, the flow is hindered, and boundary layers are formed.B. The disturbances on the streamlines in high Reynolds number flow produces boundary layer.C. The existence of walls or “boundaries” that keep the fluid inside (or outside) creates the boundary layer.D. Velocity profiles are inherently approaching no-slip condition because of the resistance of the walls.