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Statistics of Admixture Distribution in Flows Through Rigid Foams

发布日期:2017-07-11访问次数:字号:[ ]

报告人:Petr Denissenko (副教授)

时间:2017714日下午200-300

地点:东校区水院楼101

主办:水利与土木工程学院

联系人:韩宇18201610386

Petr Denissenko简历:

英国Warwick大学流体力学副教授,主要研究方向为试验流体力学,生物流体力学等。多篇文章发表在PNAS, Journal of Fluid Mechanics, Physics Review Letters, Physics of Fluids 等。

 

报告摘要:

Diffusion and dispersion of admixture in flows through rigid foams need to be accounted for when modelling catalytic reactions on the foam surface. We study diffusion of admixture and scaling exponents of admixture concentration both experimentally and by numerical simulations. A liquid
admixture was continuously released from a point source at the upstream boundary of a block of rigid SiC foam. Foam thickness was varied from 20 to 80 average pore sizes. A flow with Re of up to 300 based on the pore size was imposed by a progressive cavity pump. The distribution of the tracer at the exit from the foam was measured using LIF and the concentration moments have been calculated. Numerical simulation of the flow in laminar regime has been performed within OpenFoam for the Re from 1 to 100. Geometry of the sample was acquired by Micro Computed Tomography scanning of the actual foam sample. A steady-state SIMPLE method was used to solve the incompressible steady flow in the volume of 20x20x40 average pore sizes. Diffusion and dispersion of passive scalar has been studied by following individual streamlines. Results are interpreted in terms of mixing, heat transfer, and selectivity of catalytic reactions at the foam surface.





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