Steam flows through a well-insulated throttling valve. the upstream (inlet) conditions are 500°f and 300 psia, and the downstream (outlet) pressure is 5 psia. (a) what is the downstream temperature (°c) of the stream? (b) for the same temperature and pressure conditions as stated above, if the flowing fluid was air (which you may assume is an ideal gas with cp-1.055 kj/kg"c), what would be the downstream temperature (°c)?

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?

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.