Ahorizontal cylinder is separated into two compartments by an adiabatic frictionless piston. one side contains 0.2 m3 of nitrogen and the other side contains 0.1 kg of helium, both initially at 20°c and 95 kpa. the sides of the cylinder and the helium end are insulated. now heat is added to the nitrogen side from a reservoir at 500°c until the pressure of the helium rises to 120 kpa.

determine

(a) the final temperature of the helium,

(b) the final volume of the nitrogen,

(c) the heat transferred to the nitrogen,

(d) the entropy generation during this process.

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

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?

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.