Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to ____________________?
Correct answer: A. hG = 1.004G0.37
- A. hG = 1.004G0.37
- B. 1.004G0.8
- C. hG = 0.0176G0.37
- D. 0.0176G1.37
Explanation
For air flowing perpendicular to the drying surface, the empirical correlation changes to hG = 1.004G^0.37. The exponent and coefficient differ from the parallel-flow relation because the flow pattern changes the boundary layer.
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