## THERMAL SCIENCE

International Scientific Journal

### Thermal Science - Online First

online first only
### Numerical study of heat and mass transfer optimization in a 3D inclined solar distiller

**ABSTRACT**

A numerical study of the 3D double-diffusive natural convection in an inclined solar distiller was established. The flow is considered laminar and caused by the interaction of thermal energy and the chemical species diffusions. The governing equations of the problem, are formulated using vector potential-vorticity formalism in its three-dimensional form, then solved by the finite volumes method. The Rayleigh number is fixed at Ra=105 and effects of the buoyancy ratio and inclinationare studied for opposed temperature and concentration gradients. The main purpose of the study is to find the optimum inclination angle of the distiller which promotes the maximum mass and heat transfer.

**KEYWORDS**

PAPER SUBMITTED: 2015-03-23

PAPER REVISED: 2015-09-10

PAPER ACCEPTED: 2015-09-29

PUBLISHED ONLINE: 2015-11-15

- S. Ostrach, Natural convection with combined driving forces, Phys. Chem. Hydrodyn.,(1980), 1, pp. 233-247.
- V.A.F. Costa, Double diffusive natural convection in a square enclosure withheat and mass diffusive walls, Int. J. Heat Mass Transfer, (1997),40, pp. 4061-4071.
- V.A.F. Costa, Double-diffusive natural convection in parallelogrammic enclosures, Int. J. Heat Mass Transfer 47, (2004) pp.2913-2926.
- T. Nishimura, M. Wakamatsu, A.M. Morega, Oscillatory double diffusiveconvection in a rectangular enclosure with combined horizontal temperatureand concentration gradients, Int. J. Heat Mass Transfer,(1998), 41,pp. 1601-1611.
- R. Chouikh, L. Ben Snoussi, A. Guizani, Numerical study of the heat and masstransfer in inclined glazing cavity: application to a solar distillation cell, Renew Energ, (2007),32, pp.1511-1524.
- N. Nithyadevi, Ruey-Jen Yang, Double diffusive natural convection ina partially heated enclosure with Soret and Dufour effects, Int. J. Heat Fluid Flow,(2009), 30, pp. 902-910.
- I. Sezai and A.A Mohamed, Double diffusive convection in a cubic enclosure with opposing temperature and concentration gradients, physics of fluids, (2000),12, pp. 2210- 2223
- A. Abidi, L. Kolsi, M. N. Borjini, H. Ben Aissia and M. J. Safi, Effect of heat and mass transfer through diffusive walls on three-dimensional double-diffusive natural convection, Numerical Heat Transfer,(2008), Part A,53, pp. 1357-1376
- M.M. Naim, Solar desalination spirally-wound module, Alternative Energy Sources VIII, T.N. Veziroglu, Ed., Hemisphere Publishing, (1987) pp.571-580.
- B. Bouchekima, Bernard Gros, Ramdane Ouahes, Mostefa Diboun, Theoretical study and practical application of the capillary film solar distiller, Renewable Energy,(1999),16, pp. 795-799
- B. Bouchekima, Bernard Gros, Ramdane Ouahes, Mostefa Diboun, Etude théorique et application pratique du distillateur solaire à film capillaire, Int. J. Therm. Sci., (2000),39,pp. 442-459.
- B. Bouchekima, A small solar desalination plant for the production of drinking water in remote arid areas of southern Algeria, Desalination, (2003),159, pp. 197-204.
- L. Ben Snoussi, R. Chouikh, A. Guizani,Numerical study of the natural convection flow resulting from the combined buoyancy effects of thermal and mass diffusion in a cavity with differentially heated side walls, Desalination,(2005),182, pp. 143-150.
- K. Sampathkumar and T.V. Arjunanb, P. Pitchandia, P. Senthilkumarc, Active solar distillation-A detailed review, Renewable and Sustainable Energy Reviews, (2010),14(6), pp. 1503-1526
- K. Ghachem, L. Kolsi, Ch. Mâatki, A. K. Hussein, M.N. Borjini, Three-dimensional double diffusive free convection and irreversibilities studies in a solar distiller, International Communications in Heat and Mass Transfer,(2012),39(6),pp. 869-876.
- R. Alvarado-Juárez, J. Xamána, G. Álvarez , I. Hernández-López, Numerical study of heat and mass transfer in a solar still device: Effect ofthe glass cover, Desalination, 2015,359, pp 200-211
- R. Alvarado-Juárez, G. Álvarez, J. Xamán, I. Hernández-López, Numerical study of conjugate heat and mass transfer in a solar still device, Desalination (2013),325, pp. 84-94
- S. Chen, B. Yang, X. Xiao, C. Zheng, Analysis of entropy generation in double-diffusive natural convectionof nanofluid, International Journal of Heat and Mass Transfer (2015), 87, pp.447-463