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Turbulence at low Reynolds number: heat transfer enhancement in sheared suspensions.

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1540
pages 1500-1503

O. Rahli
IUSTI-CNRS UMR 7343, AMU, 13453 Marseille Cedex 13, France

Xiaolong Yin
Petroleum Engineering, Colorado School of Mines, Golden, Colorado, USA

P. Rognon
IUSTI-CNRS UMR 7343, AMU, 13453 Marseille Cedex 13, France

B. Metzger
IUSTI-CNRS UMR 7343, AMU, Marseille 13453 Cedex 13

Sinopsis

We investigate experimentally the heat transfer across a sheared suspension of non-Brownian spherical particles f owing at very low Reynolds number (Re « 1). Particles within the f uid collide with each other, resist the straining motion and rotate when the suspension is set into motion. This produces velocity disturbances within the f uid which are chaotic. In the same way as turbulence produces chaotic mixing at large Reynolds number, we show that in sheared suspensions f owing at very low Reynolds number, the phenomenon referred as shear-induced diffusion, greatly enhance the transfer of heat (> 300%). We also show that enhanced heat transport observed in sheared suspensions is well correlated to the particle diffusion.

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