Principles of Mass Transfer

BKF 2432: MASS TRANSFER FKKSA, UMP Principles of Mass Transfer (CHAPTER 7) Mass Transfer Coefficient for Various Geome

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BKF 2432: MASS TRANSFER

FKKSA, UMP

Principles of Mass Transfer (CHAPTER 7) Mass Transfer Coefficient for Various Geometries

2008/2009 II

1

BKF 2432: MASS TRANSFER

FKKSA, UMP

Topic Outcomes 

It is expected that student will be able to: 



Apply the convective mass transfer coefficient of molecular diffusion in various geometries. Solve mathematical solution of molecular diffusion in various geometries.

2008/2009 II

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BKF 2432: MASS TRANSFER

FKKSA, UMP

Content 

Prediction of mass transfer coefficient   

 



Dimensionless number Mass Transfer for Flow Inside Pipes Mass Transfer for Flow Parallel to Flat Plates Mass Transfer for Flow Past Single Spheres Mass Transfer to Packed Bed Flow Perpendicular to Single Cylinder

2008/2009 II

3

BKF 2432: MASS TRANSFER

FKKSA, UMP

Dimensionless number

2008/2009 II

4

BKF 2432: MASS TRANSFER

FKKSA, UMP

Dimensionless Number 

Reynolds Number

N Re 

L



Equation 7.3.1



L= Dp for sphere; Diameter, D for pipe; Length, L for flat plate



Schmidt Number

N Sc  

Sherwood Number

 DAB

Equation 7.3.2

k'c L (kc y BM )L k'x L N   sh  DAB DAB c DAB

Equation 7.3.3

- Use for correction of mass transfer coefficient obtained from experimental data 2008/2009 II

5

BKF 2432: MASS TRANSFER

FKKSA, UMP

Dimensionless Number 

Stanton Number

k'c k'G P k'y N St    v GM GM

Equation 7.3.4

GM= vρ/MAv=vc 

JD factor



JD 



2 2 1 k'c k'G P 3 3 3 N  N  N / N .N  Sc   Sc  Sh Re Sc v GM



Equation 7.3.5

- Use for correction of mass transfer coefficient obtained from experimental data

 2008/2009 II

6

BKF 2432: MASS TRANSFER

FKKSA, UMP

Mass Transfer for Flow Inside Pipes

2008/2009 II

7

BKF 2432: MASS TRANSFER

FKKSA, UMP

Mass Transfer for Flow Inside Pipes

1. Laminar Flow    

N Re < 2100 For liquid and gases flowing inside pipe Use Figure 7.3-2 Use rodlike flow

2008/2009 II

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BKF 2432: MASS TRANSFER

FKKSA, UMP

Laminar Flow

2008/2009 II

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BKF 2432: MASS TRANSFER

FKKSA, UMP

Mass Transfer for Flow Inside Pipes 2. 



Turbulent Flow

N Re > 2100 0.6