Heat-transfer Questions Set 15:
Convective heat transfer coefficient doesn't depend on
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For which of the following processes is the work done zero?
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If the flow is laminar with a Reynolds number of 1567.2, what is the friction factor?
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A fin would be effective in dissipating heat when the ratio P*k/(h*A) is ____
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The Prandtl Number provides a measure of the relative effectiveness of the momentum and energy transport by diffusion.
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Find the rate of conduction heat transfer through a 1.5 cm thick board (k = 0.16 W/m·K), with a temperature difference of 20°C between the two sides.
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What is the temperature distribution associated with radial convection through a cylinder for steady state and a constant value of thermal conductivity?
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Of the radiant energy 350 W/m2 incident upon a surface, 250 W/m2 is absorbed, 60 W/m2 is reflected, and the remainder is transmitted through the surface. Calculate the absorptivity of the surface material.
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If there are three thermal resistors (R1, R2, R3) connected in series with values 0.25 K/W, 0.45 K/W, and 0.65 K/W respectively, then find the total thermal resistance offered by the three resistors.
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A counter flow heat exchanger is used to cool 2000 kg/hr of oil (cp = 2.5 kJ/kg·K) from 105°C to 30°C by using water entering at 15°C. If the overall heat transfer coefficient is expected to be 1.5 kW/m²·K, find the water flow rate. Assume the exit temperature of the water does not exceed 80°C.
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