Open AccessEffect of shear-induced diffusion on the transfer of heat across a sheared suspension
Author(s) -
O. Rahli,
Xiaolong Yin,
Bloen Metzger
Publication year - 2013
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.4812120
Subject(s) - brownian motion , suspension (topology) , mechanics , shear flow , lattice boltzmann methods , heat transfer , reynolds number , thermal diffusivity , volume fraction , materials science , mass transfer , diffusion , particle (ecology) , turbulence , thermodynamics , physics , composite material , oceanography , mathematics , quantum mechanics , homotopy , pure mathematics , geology
7th International Conference on Micromechanics of Granular Media (Powders and Grains), Sydney, AUSTRALIA, JUL 08-12, 2013International audienceSuspensions of non-Brownian particles undergoing shear provide a quasi-unique system where mixing occurs spontaneously at low Reynolds number. In essence, particles behave in the fluid as so many ``stirrers''. The questions raised are how do they affect the transport of heat/mass across sheared suspensions ? What will be the influence of the particle size, their volume fraction and the applied shear ? By using an index matched suspension and a laser induced fluorescence imaging technique, we were able to measure individual particle trajectories and correlate the particle diffusion motion to the thermal diffusion of the suspension. Shear-induced diffusion causes a significant enhancement (> 200%) of the suspension transport properties. Simulations which combine a Lattice Boltzman technique to solve the flow and a passive Brownian tracer algorithm to solve for the transfer of heat are in very good agreement with experiments
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