Engine oil at 60degreeC flows over a 5 m long flat plate who

Engine oil at 60degreeC flows over a 5 m long flat plate whose temperature is 20degreeC with a velocity of 2 m/s. Determine the the rate of heat transfer per unit width of the entire plate.

Solution

Given Data :

Engine oil temperature(T) = 60⁰c = 333k

Velocity of flow of oil (V) = 2 m/s

plate temperature(T_S) = 20⁰C =293k

length of the plate(L) = 5m

width of the plate(b) = 1 m

Q = (T - T_S) / L/kA

area of the plate (A) = Length(L) x width(w)

A = 5 x 1

A = 5 m²

thermal conductivity factor for the plate at 20⁰c is 0.2 W/m-K

Rate of heat transfer (q) = KA(333-293) / 5 = 0.2 x 5 x (40) / 5 = 8 kw

THERFORE THE RATE OF HEAT TRANSFER PER UNIT WIDTH OF PLANE IS 8 KW