Heat-transfer Questions Set 8:
What is the unit of thermal resistance?
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A thin glass plate is an example of a transparent body.
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On which of the following surfaces is dropwise condensation likely to occur?
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Heat is exchanging, due to radiation only, between two concentric spheres. The ratio of their diameters is 2. Find the fraction of energy (in percentage) reaching the larger sphere from the smaller sphere.
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To find the rate of effectiveness of a fin, which parameter is required in addition to the rate of heat transfer without fins?
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Given:
a = thickness of velocity boundary layer
b = thickness of thermal boundary layer
Which of the following options is correct for a more viscous fluid like oil?
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According to Dalton's law of partial pressures, the total pressure pb (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour) is given by which of the following statements?
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Find the intensity of the current flow in a stainless steel tube with inner diameter of 12 mm, thickness of 0.2 mm, and length of 50 cm, which is heated electrically and the entire 15 kW of heat energy generated in the tube is transferred through its outer surface.
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In conductive heat transfer, atoms don't move but vibrate to transfer heat energy. What is the approximate relation between the density of matter (p) and the time (t) required to heat through conduction, where k is a constant and n is an exponent greater than 1?
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Determine whether the lumped system analysis is applicable for a system with the following parameters: convective heat transfer of 60 W/m²K, thermal conductivity of 200 W/mK, and length characteristic of 0.025 m.
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