Parallel flow of air over a flat plate of length 3m is disrupted by an array of stationary rods placed in the flow path over the plate. an empirical correlation for the local heat transfer coefficient is obtained for a velocity, v and ts> [infinity]t: hx=0.7+13.6x-3.4x2, where hx has units of w/(m2*k) and x is in meters. evaluate the average heat transfer coefficient for the entire plate and the ratio llh/h at the trailing edge. also plot the heat transfer coefficient as a function of x (from x=0 to x=3m). how does this plot compare to flow over a flat plate without any stationary rods?

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.

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.