Chemical Engineering :: Heat Transfer
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Nucleate boiling is promoted
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In forced circulation, the heating element is injected
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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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The equation, Nst = f/2, is the __________ analogy.
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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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Rate of crystallisation does not depend upon the
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Stefen's block body radiation law can also be derived from __________ law.
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Multipass heat exchangers are used
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A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,
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Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2 .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the
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A.
the cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant.
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B.
both the spheres will emit equal amount of radiation per unit time in the beginning.
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C.
both will absorb equal amount of radiation from the surrounding in the beginning.
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D.
both(b) & (c).
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