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Experimental Investigations on Pressure Field and Microfiltation Mechanism of an Outside Helical Flow Module

Author: ShenLiang
Tutor: LiJianMing
School: Sichuan University
Course: Chemical Process Equipment
Keywords: Outside the cyclone Microfiltration Pressure Flux Pollution layer resistance
CLC: TQ051
Type: Master's thesis
Year: 2002
Downloads: 117
Quote: 1
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Abstract

Outer swirl Microfiltration is a novel use of centrifugal force field flux enhancement device. Suspension to be separated from the tangential flow membrane device, the shell membrane and membrane forming a ring rotating at high speed cross interstitial flow, can effectively overcome the concentration polarization and membrane fouling phenomena adversely affected. This is the first such device on the fluid pressure field measurement, combined with flux experiments, systematic study of this kind of mechanism of membrane separation device. First, create a new experimental system, while completing manometry and measured flux experiments. By changing the feed concentration and operating pressure liquid imports, exploring different conditions and pressure field fluxes. Accomplish the same kind of conditions outside the cyclone and the outer axial-flow cross-flow microfiltration effect of comparative experiments. Secondly, the analysis of experimental data and found that the annulus pressure profile along the radial direction saddle distribution pipes and casing near the membrane surface is large, increasing the axial direction, irrespective of the gravity field is a slight decrease of the law, put forward the largest membrane device The concept of effective length; annulus has a similar vertical section of the vortex Taylor Vortices exist, leading to pressure fluctuations in both radial and axial; operating pressure and has caused an increase in the concentration of the pressure field increases, but the rate of increase increasingly is smaller. Third, the establishment of the steady-state flux attenuation empirical model and dynamic model of two new models, the former will summarize the factors that affect the deposition flux inlet Reynolds number and Euler number and other important dimensionless number group proposed Specific formulas for the design of new mode is amplified; which is a power function model, a linear model is more than the original permeate flux with time closer to the actual process. Respectively, using the experimental results of these two flux model is validated, the maximum deviation of 13.9% and 30%. Finally, the motion of particles in the flow field and stress analysis, draw constant flux and pressure drop, swirling particles in the boundary layer and the membrane surface does not enter the boundary layer is not deposited particle size range, derived from the membrane surface pressure and flux formulas for solving pollution layer resistance. Solving the pollution condition of each layer resistance, pressure and flux of the membrane surface comprehensive experiments, we found feed concentration and operating pressure increases the fluid pressure field increases the contamination layer resistance also increases, but because both change different amplitudes, resulting permeate flux decreases sharply when the concentration increases, and the increase in the operating pressure increases slowly ? different results. In short, the outer cyclone is the traditional cross-flow microfiltration filter of an enhanced, especially for low-voltage operating conditions, the concentration of 0 5% suspension knife separation.

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