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Scaling Relation of the scalar diffusion in a Rotating Mixer

Journal of Shanghai Jiaotong university(Science) 2021年第2期26卷 170-175页

作者： SUN Na WANG Lipo LI Yuanbo LI Lin QI Shuaipeng SHEN Yongxing Shanghai Space Propulsion Technology Research Institute Shanghai 201109China University of Michigan-Shanghai Jiao Tong University Joint Institute.Shanghai Jiao Tong University Shanghai 200240China

scalar mixing is under the joint control of convection and *** ratio of the dissipative scale of velocity field to that of the scalar field depends on the Schmidt *** the high Schmidt mumber *** scalar scale is much smaller than that of the momentum,which then reguires either special treat ment or ad hoc models for the sealar quantity in mumerical *** order to avoid model uncertainty or unnecessary numerical *** direct numerical simulation is performed for studying the scalar mixing process in a confined rotating mixer *** has been found that in the range of negligible mumerical diffusivity the characteristic scalar mixing time is inversely proportional to the scalar *** based on the dimensional argument justifies such scaling relation as *** which the unaccepted computational time of the nixing process in the high Schmidt number limit can be efficiently determined,without the use of ad hoc models This scaling idea is also of practical meaningfulness for ot her similar problems.

关键词： scalar diffusion Schmidt mumber scaling relation rotating mixer

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INFLUENCE OF COHERENT STRUCTURE ON scalar diffusion IN TURBULENT BOUNDARY LAYERS

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Journal of Hydrodynamics 1999年第4期11卷 99-103页

作者： Fan Jing yu, Wang Dao zeng Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, P.R.China Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 P.R.China

Simulation experiments of scalar diffusion have been performed using flow visualisation, quantitative measurement and frequency spectra analysis techniques in an atmospheric boundary layer wind tunnel and in an open tidal water flow channel. The results of experimental research and theoretical analysis indicate that the turbulent intermittent phenomenon plays an important role in scalar diffusion in shear flows. In the near fleld, the scalar diffusion is mainly affected by the nonisotropic quasi periodic large scale coherent structure of turbulence. The rough values of time and space scales of turbulent coherent structure have been obtained by combining flow visualisation with turbulent frequency spectra analysis.

关键词： scalar diffusion coherent structure turbulent boundary layer

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