Simulation of A Thin- Liquid smooth Falling- Film In An Absorption Cooling System
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 1
Abstract
Refrigeration hinges largely on efficient cooling system, energy conservation and environmental safety. In this work, a numerical model for the absorption process on a thin-liquid smooth falling-film in an absorption cooling system using Lithium Bromide (LiBr) and Lithium Chloride (LiCl) solutions was developed. The model considered a twodimensional steady laminar flow within the film thickness to the absorber wall and utilized conservation of mass, energy and momentum equations for its development. The domain was discretised and the finite difference formulated equations were applied across each element including boundary conditions. Standard values of the absorber dimension and fluid properties were utilized in the MATLAB programming for the simulation. Data were validated using student t-test. With the bulk and interface of the film approaching an equilibrium concentration of 54.0% at a wall temperature Tw = 35oC, the Concentration distributions within the film thickness in the bulk and interface between the liquid and vapour region ranged between 60.0 and 54.0% while that of the temperature was between 44.4 and 35.0 oC for LiBr – Water solution. While for the LiCl–Water solution, when the bulk and interface concentration approaches an equilibrium concentration of 35.8% at Tw = 30oC, the concentration distribution within the film thickness in the bulk and interface between the liquid and vapour region were between 45.0 and 35.8% and temperature range was between 35 and 30oC. The developed model in this work established that the interface and bulk concentrations reaches equilibrium faster for LiCl–Water solution than LiBr–Water solution.
Authors and Affiliations
K. M. Odunfa, C. E. Onwuka, L. O. Ajuka
Keywords
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- EP ID EP437694
- DOI 10.9790/1684-1501034550.
- Views 42
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