CHEMICAL ENGINEERING
MASS TRANSFER 235 The first boundary condition is atyD 0 ,CADCAi, andCAiDA. Hence: CADCAicoshaxCBsinhax iii The second boundary ...
236 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Calculate the time taken for the liquid level to fall to 5 cm below the top of the t ...
MASS TRANSFER 237 PROBLEM 10.19 A crystal is suspended in fresh solvent and 5% of the crystal dissolves in 300 s. How long will ...
238 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Mass transfer rate at the surfaceDD ( ∂CA ∂y ) yD 0 ∂CA ∂y DCAs ∂ ∂y { 2 p ∫ 1 y ...
MASS TRANSFER 239 Putting dCA/dyDq: d^2 CA dy^2 D dq dy D dq dCA dCA dy Dq dq dCA Thus: Dq dq dCA kC^2 AD 0 qdqDk/D C^2 AdCA ...
240 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS constant fractional rate of surface renewal,s, but an upper limit on surface age equ ...
MASS TRANSFER 241 In general,CA 06 D0andNAD 2 CAiCA 0 p D/4for mass transfer without surface renewal. Random surface renewal ...
242 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Solution As in the previous problem, the basic equation is: ∂CA ∂t DD ∂^2 CA ∂y^2 (e ...
MASS TRANSFER 243 X eX 2 erfX erfcXX p erfcX Right hand side 1 0.368 0.843 0.157 0.278 0.0897 0.9 0.445 0.797 0.203 0.324 0.12 ...
244 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS At a pressurePkN/m^2 : nDPA/ 101. 3 1 / 22. 4 273 / 293 D 4. 11 ð 10 ^4 PAk ...
MASS TRANSFER 245 Then: ∂CN^0 ∂t D ∫ 1 0 ept ∂C^0 ∂t dt (equation 10.102) D[eptC^0 ]^10 Cp ∫ 1 0 eptC^0 dtDpCN^0 (equation 10 ...
246 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Then: (a) The mass transfer coefficientD 2 √ D t D 2 1. 2 ð 10 ^8 /ð 5. 55 0.^5 ...
MASS TRANSFER 247 When tD 0 , L<y< 0 CADCA 0 When tD 0 , 0 <y<L CAD 0 When t> 0 yDLCADCA 0 When t> 0 yDCLCAD ...
248 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS PROBLEM 10.26 A pure gas is absorbed into a liquid with which it reacts. The concent ...
MASS TRANSFER 249 whenBis not undergoing mass transfer, oruBD0, then: RTdCA/dy DFABCBN^0 A N^0 AD RT FABCB dCA dy D RT FABCT ...
250 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS N^0 ADD^0 CT CN 2 CH 2 lm ð CCO 2 L DD^0 ð 1 yN 2 CH 2 lm ð CTyCO 2 L yCO 2 D ...
MASS TRANSFER 251 If the rates from each model are equal, then: 2 Kte^1 /^2 DK p s or steD 4 / PROBLEM 10.29 Ammonia is absor ...
252 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS CAxatyD0 is now a variable yD1,CAD 0 Hence: AD0andCNADCNAxe p p/D y and: dCNA dy D ...
MASS TRANSFER 253 or: √ Dt L^2 eDt/L 2 erfc √ Dt L^2 D √ 1 ð 0. 16 D 0. 0903 writing XD √ Dt L^2 thenXeX 2 erfcXD 0. 0903 Solv ...
254 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS or: D dCA dy { D dCA dy C d dy ( D dCA dy ) dy } Dk 2 C^2 A dy D d^2 CA dy^2 ...
«
8
9
10
11
12
13
14
15
16
17
»
Free download pdf