Q3. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a...
This is for static air don't just copy from others', this is a different problem. 1. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500 K. The cylinder is left to cool in a large room of static air at 300 K. Calculate a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is 500 K, and 10] 15]...
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...
A very long cylinder (diameter 1 mm) is placed perpendicular to a steady air stream whose velocity is 10 m/sec. The cylinder is heated electrically; the power input is 100 watts per meter span. At what distance downstream is the rms temperature fluctuation in the wake of the cylinder reduced to 1 0C? Assume that the distribution of the mean temperature difference in the wake is similar to the distribution of the mean velocity defect. What is the mean temperature...
A long wire with circular cross section and diameter D = 1 mm is submerged in an oil bath with temperature To 20。C. The wire is initially at temperature T = 20。C, the same temperature as the oil. A current is passed through the wire, resulting in a volumetric heat generation of q - 1.5 x 108 W/m3. The convection coefficient is h - 500 W/m2 - K, and the properties of the wire are ρ-8000 kg/m3, Cp-500 J/kg-K, and...