Double diffusion natural convection in a square cavity filled with nanofluid

Abstract

A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractDouble diffusive natural convection of nanofluid is commonly found in renewable energy engineering. However, nowadays our understanding on its fundamental characteristics is still limited. Especially, three crucial questions on its fundament have not been answered yet: (1) its performance not only in laminar regimes but also beyond laminar regimes, (2) the influence of the ratio of buoyancy forces on heat and mass transfer, (3) the correlation among the dimonsionless quantities which describe the features of this kind of convection. The present work tries to reveal the characteristics of double diffusion natural convection of nanofluid over a wide range, from laminar regimes to turbulent regimes, with the aid of numerical experiments. It is observed that the behavior of nanofluid in the laminar regimes is different from that in the turbulent regimes. Some conclusions presented in previous literatue for laminar double diffusion of nanofluid may be invalid in its turbulent counterpart. The effect of the ratio of buoyancy forces on heat and mass transfer of nanofluid possesses some similarities with the pure base fluid as well as some obvious differences. Especially, a power-like correlation among the Nusselt number, Sherwood number, Rayleigh number, ratio of buoyancy forces and nanoparticl volume fraction has been extracted for the first time through our numerical experiments.

Modeling incompressible thermal flows using a central-moments-based lattice Boltzmann method

“…The motivation of the present work is to extend CLBM to incompressible thermal flows. Up to now, the double-distribution function (DDF) approach has been extensively used for constructing thermal LBMs [8,27,28,29,30,31,32,33]. In DDFbased incompressible thermal LBMs, a density or pressure distribution function is used to solve the velocity field, with another distribution for temperature field, where the two fields are usually coupled through the Boussinesq approximation [29,30].…”

Double-diffusive mixed convection of pseudoplastic fluids in an inclined square cavity partially heated

“…Chen et al [4] studied numerically the double diffusive natural convection in a square cavity filled with a nanofluid. Their work tries to reveal the characteristics of the double diffusive natural convection over a wide range, from laminar to turbulent regimes, with the aid of numerical experiments.…”

Numerical study of nanofluid natural convection in a square cavity with a hot obstacle using lattice Boltzmann method

“…Chen and his coworkers [22] conducted entropy generation analysis on double-diffusive natural convection of nanofluid in a rectangular enclosure to deepen our insights into the performance of solar thermal systems. Chen and his coworkers [23] investigated double diffusion natural convection in a square cavity filled with nanofluid. Sheremet and his coworkers [24] investigated the effects of solid isothermal partition insertion in a nanofluid filled cavity that is cooled via corner isothermal cooler.…”