In this paper a numerical investigation on the double diffusive natural convection in finned solar still is performed using finite volume method. The 3D vector potential-vorticity formalism used to eliminate gradient pressure terms and due complex shape of cavity blocked-off-region method adopted. After getting dimensionless governing equations, they are written generalised form then discretise...

A model for heat-recirculating micro combustor is developed. It investigates the structure of laminar, one-dimensional and steady state flame propagation in uniformly premixed wood particles with considering the effects of heat recirculation caused by configuration of micro combustor. The flame structure is divided into three regions: a preheat-devolatilization zone where the rate of the gas-ph...

Analytical and numerical investigations were performed to study the influence of Soret Dufour effects on double-diffusive convection in a vertical porous layer filled with binary mixture subject horizontal thermal solute gradients. In particular, was focused effect diffusion bifurcation types from rest state toward steady convective state, then oscillatory state. The Brinkman-extended Darcy mod...

The problem of Benard double diffusive Marangoni convection is investigated in a horizontally infinite composite layer system enclosed by adiabatic boundaries for Darcy model. This subjected to three temperature gradients with constant heat sources both the layers. lower boundary porous region rigid and upper fluid free effects. Eigenvalue ordinary differential equations solved closed form Ther...

Double diffusion refers to a variety of turbulent processes in which potential energy is released into kinetic energy, made possible the ocean by difference molecular diffusivities between salinity and temperature. Here, we present new method for estimating dissipation rates forced double-diffusive convection using temperature data alone. The estimates up-gradient diapycnal buoyancy flux associ...

Magnetohydrodynamic mixing of two fluids in an annular microchannel is modelled as a twodimensional, laminar, convection-diffusion problem, and examined using asymptotic analysis and numerical simulation. The time T required for mixing of a plug of solute depends on the Peclét number Pe, and on the geometry of the annulus. Three scaling regimes are identified: purely diffusive, Taylordispersive...

The analysis of entropy generation provides valuable information for the design and optimization thermal systems. Solar stills are used water desalination purification. Using renewable energies, they provide a sustainable solution drinking supply in remote areas off-grid situations. This work focuses on 3D numerical study two-stage solar still subjected to natural double diffusion convection ph...