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GATE ME 2022: Heat Transfer
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Temperature profile in case of heat transfer through hollow sphere.
A wall of thickness 0.6 m has a normal area 2 m2 and is made up of material of thermal conductivity 0.5 W/mk. The temperature on the two sides are 900 °C and 200 °C what is the thermal resistance of the wall?
Heat is lost from a 100 mm diameter steam pipe placed horizontally in ambient air at 300C. If the Nusselt number is 25 and thermal conductivity of air is 0.03 W/m-K, then heat transfer coefficient will be
In the laminar flow of air (Pr = 0.7) over a heated plate. if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then
A hot body at a temperature of 5000 °C emits radiation at a wavelength of 0.5 μm. A furnace at 500 °C will emit a radiation of wavelength______.
A tubular heat exchanger is to be design for cooling from a temperature of 800C to 300C by a large stagnant water which may be assumed to remain constant at a temperature of 200C. The heat transfer surface consist of 30 m long straight tube of 20 mm inside diameter. The oil (specific gravity =0.8) flows through cylindrical tube with an average velocity of 50 cm/s. The overall heat transfer coefficient is 298.7 W/m2 – 0C. The heat transfer through the heat exchanger is _____________ kW.
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Jun 17ESE & GATE ME
Apoorbo RoyMember since Sep 2020