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Diffusion-in-Solids-and-Molecular-Diffusion-in-Fluids

For free convection circumstances, following dimensionless numbers apply
(i) Grashof number
(ii) Prandtl number
(iii) Nusselt number
Identify correct answer


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This Chapter Diffusion-in-Solids-and-Molecular-Diffusion-in-Fluids consists of the following topics

Experimental results indicate that the local heat transfer coefficient h g for flow over a flat plate with an extremely rough surface is approximated by the relation
h x = a x -0.12
Where a is a constant coefficient and x is distance from the leading edge of the plate. What is the relation between this local heat transfer coefficient and the average heat transfer coefficient for a plate of length x?

For free convection circumstances, following dimensionless numbers apply
(i) Grashof number
(ii) Prandtl number
(iii) Nusselt number
Identify correct answer

Two horizontal steam mains with diameters 5 cm and 15 cm are to be laid in a boiler house that any mutual heat effect is precluded. The mains are at the same surface temperature of 500 degree Celsius whilst the ambient air is at 50 degree Celsius. Workout the ratios of the heat transfer coefficients

For the free convection circumstances

the following dimensionless numbers apply (i) Grashof number (ii) Prandtl number (iii) Nusselt number Identify the correct answer

Diffusion in Solids and Molecular Diffusion in Fluids

Mass-Transfer