Adiabatic flow of a certain gas (r-518 j/kg-k and cv-1619 j/kg-k) occurs at a velocity of 261.9 m/s and temperature of 15°c within a duct. what is the mach number of the flow?

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

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Air (c-1.006 kj/kg.k, r-0.287 kj/kg.k) enters a nozzle steadily at 280 kpa and 77°c with a velocity of 50 m/s and exits at 85 kpa and 320 m/s. the heat losses from the nozzle to the surrounding medium at 20°c are estimated to be 3.2 kj/kg. determine (a) the exit temperature and (b) the total entropy change for this process. solve this problem using constant specific heats.