Pure aluminum is poured into a sand mold. the metal level in the pouring basin is 4.5 in. above the metal level in the mold, and the runner is circular with a 0.25 in diameter. the viscosity of the metal is 1.5e-07 lb-s/in2 and its density is 0.098 ib/in3 g 32.2 fsec 2
a) calculate the velocity of the metal when it gets into the mold.
b) calculate the flow rate of the metal when it gets into the mold.
c) calculate the reynolds number (re velocity*diameter*density/viscosity )

An air-conditioning system consists of a heating section and an evaporative cooler. air enters the heating section at 10°c and 70 percent relative humidity at a rate of 30m^3/min, and it leaves the evaporative cooler at 20°c and 60 percent relatively humidity. if the air conditioning system operates at a total pressure of 98 kpa, determine (a) the temperature and relative humidity of the air when it leaves the heating section, (b) the rate of heat transfer in the heating section, and (c) the rate of water added to air in the evaporative cooler