Chemical Engineering :: Heat Transfer
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The purpose of providing expansion bellows in the shell of tubular exchanger is to
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The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is
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In a laboratory test run, the rate of drying was found to be 0.5 x 10-3 kg/m2.s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m2/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is
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Pick out the wrong statement.
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What is the geometric mean of two heat transfer areas A1 and A2 ?
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Evaporation by thermocompression results in the
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Forced circulation evaporators are normally used for concentrating liquids having
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A.
'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate'.
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B.
In heat exchanger calculations (Δt)weighted is used in place of Δt, when it involves more than one sequence of heating or cooling i.e., desuperheating & condensation or condensation & sub-cooling.
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C.
Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted.
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D.
In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area.
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