le Goff, H.; Ramadane, A.; le Goff, P. Modelisations des transferts couples de matière et de chaleur dans l’absorption gaz-liquide en film ruisselant laminaire (Modeling of simultaneous heat and mass transfer in gas-liquid absorption in a laminar falling film). (French) Zbl 0575.76097 Int. J. Heat Mass Transfer 28, 2005-2017 (1985). The results of the integration, by fast Fourier transformation, of partial differential equations are presented for coupled heat and mass transfer, in a laminar falling film on an adiabatic wall. We give the transversal and longitudinal profiles of temperature and concentration for the example of the absorption of water vapor in a lithium bromide solution for the application of an absorption heat pump. We transform these results into general dimensionless functions which are applicable to other examples. Afterwards we propose a resolution of the same problem, using another dimensionless formulation, by the finite difference approximation, for the two cases corresponding to ’plug flow’ and a parabolic velocity profile. The results of the three methods are compared. Cited in 1 Document MSC: 76T99 Multiphase and multicomponent flows 76M99 Basic methods in fluid mechanics 80A20 Heat and mass transfer, heat flow (MSC2010) Keywords:temperature profile; concentration profile; fast Fourier transformation; laminar falling film on an adiabatic wall; absorption heat pump; plug flow PDFBibTeX XMLCite \textit{H. le Goff} et al., Int. J. Heat Mass Transfer 28, 2005--2017 (1985; Zbl 0575.76097) Full Text: DOI