Consider the laminar thermal boundary layer develop-ment
Chapter 8, Problem 8.15(choose chapter or problem)
Consider the laminar thermal boundary layer develop-ment near the entrance of the tube shown in Figure 8.4.When the hydrodynamic boundary layer is thin relativeto the tube diameter, the inviscid flow region has a uni-form velocity that is approximately equal to the meanvelocity um. Hence the boundary layer development issimilar to what would occur for a flat plate. (a) Beginning with Equation 7.23, derive an expres-sion for the local Nusselt number NuD, as a func-tion of the Prandtl number Prand the inverseGraetz number GzD?1. Plot the expression using thecoordinates shown in Figure 8.10afor Pr?0.7.(b) Beginning with Equation 7.30, derive an expres-sion for the average Nusselt number , as a func-tion of the Prandtl number Prand the inverseGraetz number GzD?1. Compare your results withthe Nusselt number for the combined entrancelength in the limit of small x.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer