Chemical Engineering · all questions

Heat Transfer
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Q221

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

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Q222

A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

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Q223

Harmonic mean temperature difference is given by

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Q224

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

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Q225

For a counter current heat exchanger with Tⁱ_h = 80°C, T°_c = 60°C, T°_h = 50°C and Tⁱ_c = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy

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Q226

Among liquids, water has a comparatively high value of thermal conductivity, due to its

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Q227

Evaporation by thermocompression results in the

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Q228

Which of the following is directly concerned with the heat transfer?

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Q229

Evaporator tubes are generally

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Q230

Boiling of milk in an open vessel is an example of __________ boiling.

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Q231

The actual temperature drop across the heating surface of an evaporator depends on the

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Q232

In Biot number, the characteristic length used is the ratio of the __________ of the solid.

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Q233

Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)

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Q234

Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low

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Q235

All analogy equations connecting friction factor and heat transfer co-efficient apply only to

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Q236

The unit of heat transfer co-efficient in SI unit is

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Q237

The main purpose of providing fins on heat transfer surface is to increase the

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Q238

Hot water (0.01 m³/min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

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Q239

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the

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Q240

Multiple effect evaporation accounts for

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