非牛顿流体薄膜流中质量传递的实验研究

本文通过实验,研究非牛顿流体层流降膜流中质量传递过程.实验系采用温壁塔测定二氧化碳在高分子水溶液中吸收速率.这些溶液符合幂律模型.实验证明非牛顿幂律流体降膜流中考虑速度分布的微分方程精确解是正确的;对拟塑性流体,用无因次长度Z<0.1作为渗透论适用范围的判据是合适的,而精确解则不受此范围的限制.

Experimental Study on Mass Transfer in Film Flow of Non-Newtonian Fluids

Mass transfer in the falling film of laminar non-Newtonian liquid was studied experimentally. A wetted column was used to measure the rate of absorption of carbon dioxide in aqueous polymer solutions, the rheological behavior of which is well characterized by the power-law model. The experimental results showed that the exact solution of the differential equation of diffusion, which considers the velocity distribution in the falling film of non-Newtonian power-law fluids, are proper. It was found that for pseudoplastic fluids it is adequate to use the dimensionless length Z<0.1 as the criterion for the applicability of the penetration theory, which the exact expressions would be applicable to the entire range of the dimensionless length.