111. The film thickness for laminar film condensation on vertical surface __________ from top to bottom.
112. The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.
113. For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then
114. A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is
115. A 2-4 heat exchanger involves
116. A BTU/hr.ft2.°F is equal to
117. A dephlegmator is a
118. Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is
119. Value of Nusselt number $$\left( {{\text{Nu}} = \frac{{{\text{hD}}}}{{\text{k}}}} \right)$$ for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is
120. What is the absorptivity of a black body?
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