CHEMICAL ENGINEERING
MOMENTUM, HEAT AND MASS TRANSFER 315 viscosityEare equal, calculate the value of the temperature gradient in a liquid flowing ov ...
316 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS and: uŁ 2 D ( CE ) duC dyC uŁ /uŁ Hence: D ( CE ) duC dyC D ( CE ) ...
MOMENTUM, HEAT AND MASS TRANSFER 317 If the shear stress at the surface isR 0 , the shearing force over areaAis the rate of chan ...
SECTION 13 Humidification and Water Cooling PROBLEM 13.1 In a process in which benzene is used as a solvent, it is evaporated in ...
HUMIDIFICATION AND WATER COOLING 319 1 kmol of vapour occupies 22.4m^3 at STP, and: volume of water removedD 3. 933 ð 10 ^4 ð ...
320 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Hence, the mass of moist air required at the inlet conditions D 3. 76 C 0. 0233 D ...
HUMIDIFICATION AND WATER COOLING 321 Solution The feed rate of wet nitrate is 1.5 kg/s containing 5.0% moisture or 1. 5 ð 5 / 1 ...
322 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Water entering with the airD 6. 10 ð 0. 007 D 0 .0427 kg/s. Water evaporatedD 0 .0 ...
HUMIDIFICATION AND WATER COOLING 323 Solution The feed rate of wet sand is 1 kg/s and it contains 50% moisture or 1. 0 ð 50 / 1 ...
324 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS PROBLEM 13.8 Water is to be cooled in a packed tower from 330 to 295 K by means of a ...
HUMIDIFICATION AND WATER COOLING 325 50 100 150 200 250 300 295 300 305 310 315 320 325 330 Operating line (HGvsqL) (qL 2 'HG 2 ...
326 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS toHG 2 D 78 .5 kJ/kg is 300 K. From Fig. 13.5 the exit air therefore has a humidity ...
HUMIDIFICATION AND WATER COOLING 327 350 300 250 200 150 100 50 280 290 300 Temperature (qK) 0 310 320 330 (qL 2 'HG 2 ) (qL 1 ' ...
328 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS 50 100 150 200 250 300 350 280 290 300 Temperature (q k) 0 310 320 330 Enthaolpy ( H ...
HUMIDIFICATION AND WATER COOLING 329 (c) the temperature to which the inlet air would have to be raised to carry out the drying ...
330 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS At 295 K: Enthalpy of moist airD 0. 0884 ð 0. 995 295 273 C 0. 017 ð 0. 0884 ...
HUMIDIFICATION AND WATER COOLING 331 The latent heat of water at 275 K is 2490 kJ/kg and, taking the specific heat of water vapo ...
332 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Temperature (K) Vapour pressure of n-butanolkN/m^2 330 5.99 335 7.89 340 10.36 34 ...
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