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RVUNL ME || Heat-Transfer || Quiz 5

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Question 1

A flat plate(3x4)m2 is immersed in a liquid having constant temperature of 27 and the plate temperature is 127 if the heat transferred from the plate to the liquid at the rate of 500kW. Assume that heat transfer is at steady state. Find the heat transfer coefficient(in W/m2k ) of the liquid side ______.

Question 2

Given that Nu = Nusselt number,
Re = Reynolds number, Pr = Prandtl number
Sh = Sherwood number, Sc = Schmidt number, Gr = Grashoff number
The function relationship for free convective heat transfer is given as,

Question 3

Air at 20 °C flows past a 250 mm long plates at a velocity of 45 m/s. If the surface of the plate is maintained at 300 °C. Take properties of air as: k = 0.03638 W/m-K, Pr = 0.682. The heat transferred from the entire plate length to air assuming unit width of the plate will be ____ W.

Question 4

Heat is lost from a 150 mm diameter pipe vertically placed in ambient at 30 °C. The height of the cylinder is 200 mm and thermal conductivity of air is 0.04W/mK. If the Nusselt number is 30, then the heat transfer coefficient will be

Question 5

The side surface of car is given as flat plate of 3m length. It receives solar heat at the rate of 500 W/m2 while car is in speed of 50 km/hr. Assume inside surface as an insulated one. Calculate nusselt number.
Given properties are ν = 1.6 x 10-5 m2/sec , Pr = 0.5

Question 6

A sphere, a cube and a disc all of the same material, quality and volume are heated to 900 K and left in air. Which of these will have the lowest rate of cooling
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