THERMAL SCIENCE

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Dalila Akrour

,

Mouloud Tribeche

,

Djamel Kalache

A THEORETICAL AND NUMERICAL STUDY OF THERMOSOLUTAL CONVECTION: STABILITY OF A SALINITY GRADIENT SOLAR POND

ABSTRACT
A theoretical and numerical study of the effect of thermodiffusion on the stability of a gradient layer is presented. It intends to clarify the mechanisms of fluid dynamics and the processes which occur in a salinity gradient solar pond. A mathematical modelling is developed to describe the thermodiffusion contribution on the solar pond where thermal, radiative, and massive fluxes are coupled in the double diffusion. More realistic boundary conditions for temperature and concentration profiles are used. Our results are compared with those obtained experimentally by authors without extracting the heat flux from the storage zone. We have considered the stability analysis of the equilibrium solution. We assumed that the perturbation of quantities such as velocity, temperature, and concentration are infinitesimal. Linearized equations satisfying appropriate prescribed boundary conditions are then obtained and expanded into polynomials form. The Galerkin method along with a symbolic algebra code (Maple) are used to solve these equations. The effect of the separation coefficient y is analyzed in the positive and negative case. We have also numerically compared the critical Rayleigh numbers for the onset of convection with those obtained by the linear stability analysis for Le = 100, µa = 0.8, and f = 0.5.
KEYWORDS
salt gradient, solar pond, solar energy, salinity, thermodiffusion, soret effect, linear stability, numerical simulation
PAPER SUBMITTED: 2010-06-13
PAPER REVISED: 2010-09-14
PAPER ACCEPTED: 2010-10-05
DOI REFERENCE: https://doi.org/10.2298/TSCI1101067A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2011, VOLUME 15, ISSUE Issue 1, PAGES [67 - 80]
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A theoretical and numerical study of thermosolutal convection: stability of a salinity gradient solar pond

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