Dry ice is placed in the bottom of a capillary tube 6.2 cm long. Air is blowing across the top of the tube. Calculate the ratio of the total flux to the diffusion flux halfway up the capillary for the following conditions:.
A. T = -124 °C, where the vapor pressure is 5 mm Hg.
B. T = -86°C, where the vapor pressure is 400 mm Hg.

Consider a 1.2 meter high and 2 meter wide glass window whose thickness is 6 mm and thermal conductivity is 0.78 w/m °c. the room temperature is maintained at 24 °c, while the outdoor temperature is -5 °c. the convective heat transfer coefficients on the inner and outer surfaces of the window are 10 w/m2 °c and 25 w/m2 °c respectively. (a) draw the thermal resistance network, etermine the steady rate of heat transfer t e glass window (c) determine the temperature of the inner surface of the window