Compressed nitrogen is contained in a reservoir and must be expanded to a mach number of unity for an industrial cleaning process. if the pressure and temperature in the reservoir are 600 kpa and 293 k respectively, what is the exit pressure, temperature and the diameter of the nozzle outlet if the mass flow rate must be 1 kg/s? let γ = 1.4, r = 296.8 j/kgk.

On a average work day more than work place firs are reorted

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?

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