Effect of distance between impeller blade tip and surface on mass transfer to a local electrode in a stirred vessel in a wide range of Sc number

IF 0.9 Q4 ENGINEERING, CHEMICAL
S. Yapici, İlhan Altay
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引用次数: 0

Abstract

ABSTRACT Stirred vessels are encountered in a wide scale of applications from bench to industrial processes, and the knowledge of the heat/mass transfer rates in these vessels is required for their design, operation and control. This work submits an investigation on the mass transfer to a small circular surface immersed in a stirred vessel in the parameter ranges of 267 < Re < 9437, 1473 < Sc < 61,422, and 0.022 < x/dK  < 0.22 for the distance between the impeller blade tip and the transfer surface. The Reynolds number was based on the impeller diameter. The electrochemical limiting diffusion current technique having a potassium ferri-/ferrocyanide system was applied for mass transfer coefficient measurements. Aqueous glycerine solutions were prepared to attain a wide range of Sc numbers. The rate of mass transfer is enhanced with increasing rotation rate, decreasing blade tip-to-electrode surface distance, and decreasing glycerine concentration. The experimental data were well correlated by the relation . GRAPHICAL ABSTRACT
大Sc数范围内叶轮叶顶与表面距离对搅拌容器内局部电极传质的影响
搅拌容器在从实验到工业过程的广泛应用中都遇到过,并且在这些容器的设计,操作和控制中需要了解这些容器的传热/传质率。本文研究了浸没在搅拌容器内的小圆表面的传质过程,参数范围为:267 < Re < 9437, 1473 < Sc < 61422, 0.022 < x/dK < 0.22。雷诺数基于叶轮直径。采用铁酸钾/亚铁氰化物体系的电化学极限扩散电流技术测定传质系数。甘油水溶液的制备可以获得大范围的Sc值。传质速率随转速的增加、叶尖与电极表面距离的减小和甘油浓度的降低而提高。该关系式使实验数据具有较好的相关性。图形抽象
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来源期刊
Indian Chemical Engineer
Indian Chemical Engineer ENGINEERING, CHEMICAL-
CiteScore
3.00
自引率
6.70%
发文量
33
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