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Thermal boundary layer is a region where : (a) Heat dissipation is negligible (b) Inertia and convection are of the same order of magnitude (c) Convection and dissipation terms are of the same order of magnitude (d) Convection and conduction terms are of the same order of magnitude |
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Answer» (c) Convection and dissipation terms are of the same order of magnitude In thermal boundary layer heat dissipate it can not be zero. Thermal boundary layer generate due to viscosity (momentum diffusivity) and molecular diffusivity of heat ( \(\alpha\) ), so its is not inertia and convection. In thermal boundary layer we finaly find convective heat transfer co-efficient (h ) either for laminar or turbulent which measure the amount of heat dissipate in the region. So, convection and dissipation are of the same order of magnitude. Convection and conduction can not be of same order as finally convection take place with joint effect of momentum and conduction. |
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