21. Pick out the wrong statement.
22. Thermal diffusivity of a material
23. $$\frac{{{{\text{C}}_{\text{p}}}.\mu }}{{\text{K}}}$$ is termed as the __________ number.
24. Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
25. Double pipe heat exchangers are preferably useful, when
26. The thermal boundary layer at NPr > 1
27. Maximum heat transfer rate is achieved in __________ flow.
28. (NRe.NPr)(D/L) is called the __________ number
29. In a boiling curve, the peak heat flux is called the __________ point.
30. Sensible heat of hot industrial flue gases can not be recovered by a/an
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