Absorption coefficient, bulk matter

All the relationships thus far developed for packed towers are correct for either isothermal or nonisothermal operation, but for the nonisothermal case they do not tell the entire story. During absorption, release of energy at the interface due to latent heat and heat of solution raises the interface temperature above that of the bulk liquid. This changes physical properties, mass-transfer coefficients, and equilibrium concentrations. More subtle side effects associated with volume changes and contributions of thermal diffusion can enter the problem [4, 5, 11, 42]. As a practical matter, where the energy release is large, as in absorption of... 

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