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Severe contradictions exist between experimental observations andcomputational predictions regarding natural convective thermal transport innanosuspensions. The approach treating nanosuspensions as homogeneous fluids incomputations has been pin pointed as the major contributor to suchcontradictions. To fill the void, inter particle and particle fluidinteractivities (slip mechanisms), in addition to effective thermophysicalproperties, have been incorporated within the present formulation. Throughthorough scaling analysis, the dominant slip mechanisms have been identified. AMulti Component Lattice Boltzmann Model (MCLBM) approach has been proposed,wherein the suspension has been treated as a non homogeneous twin componentmixture with the governing slip mechanisms incorporated. The computations basedon the mathematical model can accurately predict and quantify naturalconvection thermal transport in nanosuspensions. The role of slip mechanismssuch as Brownian diffusion, thermophoresis, drag, Saffman lift, Magnus effect,particle rotation and gravitational effects have been pictured articulately. Acomprehensive study on the effects of Rayleigh number, particle size andconcentration reveals that the drag force experienced by the particles isdominantly responsible for deterioration of natural convective thermaltransport. In essence, the dominance of Stokesian mechanics in suchthermofluidic systems is established in the present study. For the first time,as revealed though thorough survey of existent literature, a numericalformulation explains the contradictions observed, rectifies the approach,predicts accurately and reveals the crucial mechanisms and physics of buoyancydriven thermal transport in nanosuspensions.

Particle fluid interactivity deteriorates buoyancy driven thermal transport in nanosuspensions : A multi component lattice Boltzmann approach