Question

Q2) A long porous cylinder of 30 mm diameter is completely wetted by water at 34°C. Atmospheric air at 20°C and 50% relative humidity flows over the cylinder at a velocity of 20 m/s in a large radiant furnace whose walls are kept at 60°C. a. Find the convective heat and mass transfer coefficients over the porous cylinder, b. Calculate the rate of change of temperature of porous cylinder at the instant it is exposed to above mentioned conditions For porous cylinder wetted by water; p900 kg/m3, Cp 4 kJ/kgK, E0.9.

Answer 1

So'c _tusna 오 wall Qu= Radiant Heat emdltd,fton ft on a wall por dun 1T2 7 ausin andl

is Lumped Analysis T Too Ti Tau wrt time t dT at 1t -1 00 @ instant posedl to thu CondituSPreuiclad Ihs aT dt ん(A --(34-20) 2 190.1 (쿨) elt 2190, 니