Water is flowing into the top of an open cylindrical tank (which has a diameter D) at a volume flow rate of Qi and the water flows out through a hole in the bottom at a rate of Qo. The tank is constructed from wood that is old and has become very porous so that water leaks out through the walls at a rate of q per unit of wetted surface area. The initial depth of the water in the tank is Z1. a) Derive an equation for the depth of water in the tank at any time.
b) If Qi = 10 gpm, Qo = 5 gpm, D = 5 ft, q = 0.1 gpm/ft2, and Z1 = 3 ft, is the level in the tank rising or falling?

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines

Burgers vector is generally parallel to the dislocation line. a)-true b)-false