Mass transfer .th

Mass transfer

Introduction

? This is a basic, introductory treatment

? There is a significant extent of similarity between processes of heat

transfer and those of mass transfer

? Many relations are also similar

? Heat transfer and mass transfer occur simultaneously in many

important situations.

Mass transfer

Introduction

What will we study?

? Fick¡¯s law of diffusion

? One dimensional problems in a stationary medium

? Mass transfer in a moving medium

? Convective mass transfer - analogy between heat transfer and mass

transfer

? Simultaneous heat and mass trasfer

Mass transfer

W

e have learned that heat is transferred if there is a temperature difference in a

medium. Similarly, if there is a difference in the concentration of some chemical

species in a mixture, mass transfer must occur

Are the following examples mass transfer?

?

?

Air moving by fan

Water being flowed through a pipe

How about

?

?

?

Dispersion of oxide of sulfur release from power plant

Transfer of vapour into dry air

Drying of material

Mass transfer

Mass diffusion occurs in liquids and solids, as well as in gases. However, since mass

transfer is strongly influenced by molecular spacing, diffusion occurs more readily

in gases than in liquids and more readily in liquids than in solids.

Mass transfer

Mixture composition

Mass transfer

Mass transfer

R = 8.3145 J/mol?K

Mass transfer

Mass transfer

Mass transfer

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