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both the nusselt number and the biot number have the same form. what are the differences between them in terms of the variables employed and their physical significance ?


both the biot number and the nusselt number are of the form (hl/k). however, for the biot number, the thermal conductivity k used is that for the solid; for calculating nusselt number the k value as that of the fluid. the biot number is a measure of the ratio of the temnperature drop in the solid material and the temperature drop between the solid and the fluid. the nusselt number is a dimensionless version of the temperature gradient at the surface between the fluid and the solid, and it thus provides a measure of the convection occurring from the surface