The Dietus-Boelter equation for convective leat transfer`[ ( i.e.) h = 0.023 k/D (Re)^0.8 (Pr)^0.4]`cannot be used for
Answer : Option D
What is Nusselt number ?
Answer : Option B
The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)
The energy radiated from a surface Q at absolute temperature T is related as
interchange factor for radiation heat transfer from surface 'x' to
surface 'y' in case of an infinite parallel planes with emis-sivities `epsi_x` & `epsi_y`s given by