Refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -8°c and quality of 15% at a velocity of 7 m/s. at the exit, the refrigerant is a saturated vapor at a temperature of -8°c. the evaporator flow channel has constant diameter. if the mass flow rate of the entering refrigerant is 0.4 kg/s, determine: (a) the diameter of the evaporator flow channel, in cm. (b) the velocity at the exit, in m/s.

Fluids at rest possess no flow energy. a)- true b)- false

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

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.