Coulson & Richardson's Chemical Engineering Volume 1 Fluid Flow, Heat Transfer and Mass Transfer 6th. Edition by J, M. Coulson, J. F. Richardson, J. R. Backhurst, J. H. Marker | 9780750644440 | 0750644443 | Holooly

Coulson & Richardson's Chemical Engineering Volume 1 Fluid Flow, Heat Transfer and Mass Transfer

112 SOLVED PROBLEMS

Question: 9.28

Using Kern’s method, design a shell and tube heat exchanger to cool 30 kg/s of butyl alcohol from 370 to 315 K using treated water as the coolant. The water will enter at 300 K and leave at 315 K. ...

Verified Answer:

Since it is corrosive, the water will be passed th...

Question: 12.2

Water flows at 0.50 m/s through a 20 mm tube lined with β-naphthol. What is the mass transfer coefficient if the Schmidt number is 2330? ...

Verified Answer:

Reynolds number: Re = (0.020 x 0.50 x 1000/1 x [la...

Question: 10.4

In an experimental wetted wall column, pure carbon dioxide is absorbed in water. The mass transfer rate is calculated using the penetration theory, application of which is limited by the fact that the concentration should not reach more than 1 per cent of the saturation value at a depth below the ...

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For the flow of a vertical film of fluid, the mean...

Question: 13.9

Water is to be cooled from 328 to 293 K by means of a countercurrent air stream entering at 293 K with a relative humidity of 20 per cent. The flow of air is 0.68 m³/m²s and the water throughput is 0.26 kg/m²s. The whole of the resistance to heat and mass transfer may be assumed to be in the gas ...

Verified Answer:

Assuming the latent heat of water at 273 K = 2495 ...

Question: 3.8

Water in a tank flows through an outlet 25 m below the water level into a 0.15 m diameter horizontal pipe 30 m long, with a 90° elbow at the end leading to a vertical pipe of the same diameter 15 m long. This is connected to a second 90° elbow which leads to a horizontal pipe of the same diameter, ...

Verified Answer:

From equation 3.20, the head lost due to friction ...

Question: 13.10

In a countercurrent packed column, n-butanol flows down at a rate of 0.25 kg/m² s and is cooled from 330 to 295 K. Air at 290 K, initially free of n-butanol vapour, is passed up the column at the rate of 0.7 m³/m² s. Calculate the required height of tower and the condition of the exit air.Data: ...

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The first stage is to calculate the enthalpy of th...

Question: 9.31

In order to measure the temperature of a gas flowing through a copper pipe, a thermometer pocket is fitted perpendicularly through the pipe wall, the open end making very good contact with the pipe wall. The pocket is made of copper tube, 10 mm o.d. and 0.9 mm wall, and it projects 75 mm into the ...

Verified Answer:

If θ is the temperature difference (T -

T_{...

Question: 9.30

A process requires a flow of 4 kg/s of purified water at 340 K to be heated from 320 K by 8 kg/s of untreated water which can be available at 380, 370, 360 or 350 K. Estimate the heat transfer surfaces of one shell pass, two tube pass heat exchangers suitable for these duties. In all cases, the ...

Verified Answer:

For the untreated water: G

C_{p}

= (...

Question: 9.29

A flow of 1 kg/s of an organic liquid of heat capacity 2.0 kJ/kg K is cooled from 350 to 330 K by a stream of water flowing countercurrently through a double-pipe heat exchanger. Estimate the effectiveness of the unit if the water enters the exchanger at 290 K and leaves at 320 K. ...

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Heat load, Q = 1 x 2.0(350 - 330) = 40 kW Flow of ...

Question: 9.27

Estimate the heat transfer area required for the system considered in Examples 9.1 and 9.26, assuming that no data on the overall coefficient of heat transfer are available. ...

Verified Answer:

As in the previous examples, heat load = 1672 kW a...

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