Turbulence Properties of Solid-Liquid Flow in the Near-Wall Region of a Stirred Tank

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The experiment was taken in a cubic tank with a flat bottom and equipped with a down-pumping 3-blade CBY propeller, investigating solid-liquid two-phase flow in the near wall region by using 2D-PIV technique. Flow field of ten situations with different volumetric particle concentrations were investigated, including the single-phase flow. Since measurement is taken in the plane which is 2 mm from the wall, and RMS velocity in the radial dimension can be omitted compared to the other two dimensions, flow field is considered as two-dimensional. Mean velocity, turbulent kinetic energy and turbulent dissipation rate and their relationship with particle concentration were obtained and discussed in this work. The increasing particle concentration decreases the flow mean velocity but increases the turbulent dissipation rate, while the turbulent kinetic energy (TKE) presents a complicated trend. When the particle concentration is below 0.9%, like most previous studies did, TKE is attenuated; while the concentration grows up to 4%, TKE turns to increase.
2011-07-01