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?

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

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.