Engineering, 21.08.2019 03:30 marziel24
Ahydraulic oil with a kinematic viscosity of 9 x 10^-4 m^2/s and specific gravity of 0.95 flows in a 39 mm diameter pipe at 4 m/s. determine the head loss (in bar) due to friction for a 115 m long pipe.
Answers: 2
Engineering, 04.07.2019 18:10
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 -20Β°c. air approaches the tube bank in the normal direction at 0Β°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 -5Β°c and 1 atm. is this a good assumption?
Answers: 1
Engineering, 04.07.2019 19:10
The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false
Answers: 2
Engineering, 04.07.2019 19:10
Arigid tank contains 10 kg of air at 137 kpa (abs) and 21Β°c. more air is added to the tank until the pressure and temperature rise to 242 kpa (abs) and 32Β°c, respectively. determine the amount of air added to the tank. [r-0.287 kj/kg k]
Answers: 3
Ahydraulic oil with a kinematic viscosity of 9 x 10^-4 m^2/s and specific gravity of 0.95 flows in a...
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