Velocity profiles and the stress components tauij, For each of the following velocity distributions, draw a meaningful sketch showing the flow pattern. Then find all the components of tau and pvv for the Newtonian fluid. The parameter b is a constant. (a) vx = by, vy = 0,v = 0
(b) vx = by, vy = bx, v2 = 0
(c) vx = -by, vy = bx, vz = 0
(d) v = -1/2bx, vy = 1/2by, v2 = bz

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.

Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.