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Title: Study of thermal performances of falling film absorbers with and without film-inversion
Keywords: Falling film, Absorbers, Tubular, Simplified model, Film-inversion
Issue Date: 15-Jun-2007
Citation: PAPIA SULTANA (2007-06-15). Study of thermal performances of falling film absorbers with and without film-inversion. ScholarBank@NUS Repository.
Abstract: A simplified design model of a horizontal tubular absorber was developed which is suitable for routine design applications. The model included the detailed geometry and the heat and mass transfer processes in both falling film and inter-tube flow regimes. The predictions of the simplified model were compared with those of the detailed numerical model in order to establish the usefulness of the simplified model as a design tool. The semi-empirical models were developed for the inter-tube droplet and steady jet/sheet flow. The detailed experiments on inter-tube flow hydrodynamics were performed for a range of design and operating conditions. The video images of the inter-tube flow patterns were analyzed with the help of image analysis software. The hydrodynamic data thus obtained were used in the developed models to predict the vapor absorption rate for the inter-tube flow. For a typical absorber operating under practical design conditions, the contribution of inter-tube absorption was predicted by about 29-36 percents of total absorption. As an attempt to improve the thermal performances of tubular absorber, a novel Coanda-effect based film inverting absorber was proposed. The proposed design does not require any guide fins to cause the film-inversion and offers more vapor absorption performance after arranging in multiple two-film-tube columns. The experimental investigation of the Coanda-effect based film-inverting hydrodynamics was performed to verify the practical feasibility of the proposed design.
Appears in Collections:Ph.D Theses (Open)

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