If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is
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Chemical Engineering · all questionsHeat Transfer
Heat Transfer
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Temperature profile in steady state heat transfer is
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The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C-1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2 is
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In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid
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Three material A, B and C of equal thick-nes and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of __________ °C.
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In a 1-1 cocurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is
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When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.
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Boiling point elevation for a strong and concentrated solution is found by Duhring's rule, which states that at the same pressure, the boiling point of a solution is a linear function of the __________ of pure water.
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The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.
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Resistance to heat flow by conduction is proportional to (where, t & are thickness & density of the material respectively and A = area normal to the direction of heat flow.)
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Increasing the liquor level in the evaporator results in the
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Pick out the wrong statement.
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A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C.
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It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is
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In a forward feed multiple effect, the pressure build up will be
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In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will
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With increase in temperature, the thermal conductivity of a gas
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With increase in temperature, the thermal conductivity of steel
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A diathermaneous substance __________ the thermal radiation completely.
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For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in
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