Engineering, 24.05.2021 23:30 SissyBoo9680
Two separate creep experiments are running on polycrystalline Ni, one at
527oC and the other at 532oC. You observe that dε/dt increases by a factor of 1.0
for the sample tested at the higher temperature. What is the activation energy Q
for this creep mechanism?
Answers: 2
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Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false
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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?
Answers: 1
Two separate creep experiments are running on polycrystalline Ni, one at
527oC and the other at 532...
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