Abstract
The presented model applies to absorption in a falling film of constant thickness of a binary mixture with only one component in the vapour phase. The mathematical formulation with partial differential equations is based on very general assumptions. The model is validated for a horizontal tube absorber. The absorber is simplified to a series of vertical falling films with mixing conditions in between. The dimensionless absorber operating conditions are: Gz = 0.1–10, Le = 0.002 or 0.004, Λ = 0.01 or 0.02, Bi ≈ 5, θ c ≈ −0.2, N c = 0.1. The absorber consists of 10 cooled tubes, measurements were obtained at tube spacings: 0, 3, 15 and 24 mm and with sheet, droplet and jet flow in between the tubes. The correlation between predicted and measured absorption outcomes is very strong. On average the predicted outcomes equal the measured ones within the scatter, if the diffusivity is taken 0.3 times the established correlation and varies with x and y.
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