CHEMICAL ENGINEERING
HEAT TRANSFER 215 On integration: 0. 0002307 tD ∫ 323 293 dT/ 422. 3 1. 1 TD 1 / 1. 1 [ln 1 / 422. 3 1. 1 T]^333293 T ...
216 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS From (v): TwTg 20 Tw D 1. 741 TwTg 34. 82 Tg ∴ TwD 34. 82 Tg/ 20 C 0. 741 Tg K(vi ...
SECTION 10 Mass Transfer PROBLEM 10.1 Ammonia gas is diffusing at a constant rate through a layer of stagnant air 1 mm thick. Co ...
218 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS As the vapour pressure of tolueneD54 kN/m^2 , the partial pressure of toluene from R ...
MASS TRANSFER 219 If the pressure is doubled to 200 kN/m^2 , the diffusivity is halved to 0.5D (from equation 10.18) and: PA 2 D ...
220 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS In this problem:sDbtand ebt (^2) / 2 ft DconstantDk ∴ ft Dkebt (^2) / 2 The total ...
MASS TRANSFER 221 which may be written as: ∂CA ∂t DD [ ∂^2 CA ∂r^2 C 2 r ∂CA ∂r C 1 r^2 υ ∂ ( 1 ^2 ∂CA ∂ ) C 1 r^2 1 ^ ...
222 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Solution If the particle has a radiusr, and is surrounded by a spherical shell of ra ...
MASS TRANSFER 223 Concentration CAi CAo L y 0 Figure 10a. ReplacingCAibyC^0 iandCAbyC^0 where:CADC^0 CCAoandCAiDC^0 iCCAo,then u ...
224 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS D 2 C^0 i L^2 ∫L 0 ysinny/L dy 2 C^0 i L ∫L 0 sinny/L dy D 2 C^0 i L^2 ∫L 0 ^ ...
MASS TRANSFER 225 According to the Higbie model, if the element is exposed for a timete, the average rate of transfer is given b ...
226 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS approximately zero and: NAD D L CAiCAo { 1 C 2 L^2 ^2 Dte ∑^1 nD 1 [ ^2 6 1 n^ ...
MASS TRANSFER 227 The Lewis numberDh/Cp+hDDPr/ScDDCp+/k. D/DHDDCp+/kD 90 CAiCAo D 1 .54 kmol/m^3 HSD28 kJ/kmol ∴ TD 1. 54 ð 2 ...
228 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS and if the resistance to its mass transfer in air is equivalent to that of a 1 mm la ...
MASS TRANSFER 229 Solution The first part of this question is discussed in Section 10.5.2 and the required equation is presented ...
230 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS The general solution of equation (i) is: CADAcoshayCBsinhay ii whereAandBare consta ...
MASS TRANSFER 231 maintained at a constant temperature, and an air stream is passed over the top of the tube sufficiently rapidl ...
232 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Thus a plot oft/hh 0 againsthh 0 will be a straight line of slopeswhere: sD+LC ...
MASS TRANSFER 233 CB 2 D 0. 0380 0. 0141 D 0 .0239 kmol/m^3 ∴ CBmD 0. 0380 0. 0239 /ln 0. 0380 / 0. 0239 D 0 .0304 kmol ...
234 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Considering the diffusion of soluteAaway from the interface in they-direction this e ...
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