In each case calculate the biot number for the object and

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In each case, calculate the Biot number for the object and indicate whether or not the lumped approximation is valid.

a) A carbon-steel rod of length 2m and diameter 10cm is set in a crossfow of air, which results in a convective heat transfer coecient of 2*( W/m^2K).

b) A teflon sphere of diameter 20cm is dunked in an agitated tank of oil, which results in a convective heat transfer coecient of 20*( W/m^2K).

Reference no: EM13607435

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