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CH3041
GAS-LIQUID
TRANSPORT
The gas-liquid transfer process is described by a Two-Film Model.
Boundary layers
Interface
Interface
Air
Water
Water
• In each thin boundary
layer diffusion (slow) controls transport.
layer diffusion (slow) controls transport.
• In the bulk phases on either side
turbulent transport (fast) operates.
turbulent transport (fast) operates.
• The flux is
gas - liquid
• The resistance
1/r
reflects the speed of
diffusion through the boundary layers.
diffusion through the boundary layers.
• Usually one of
the resistances dominates.
High solub. gas 1/rair SO2 low solub. 1/rwater
High solub. gas 1/rair SO2 low solub. 1/rwater
