Ahot brass plate is having its upper surface cooled by impinging jet of air at temperature of 15 °c and convection heat transfer coefficient of 220 w/m2·k. the 10-cm-thick brass plate (rho = 8530 kg/m3, cp = 380 j/kg·k, k = 110 w/m·k, and α = 33.9 × 10-6 m2/s) had a uniform initial temperature of 655 °c, and the lower surface of the plate is insulated. it has a uniform nodal spacing of δx = 2.5 cm and time step of δt = 10 s.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]