Transition from turbulent to transitional flow in the top half of a stirred tank

被引：33

作者：

Machado, Marcio B. ^{[1
]}

Bittorf, Kevin J. ^{[1
]}

Roussinova, Vesselina T. ^{[1
]}

Kresta, Suzanne M. ^{[1
]}

机构：

[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2V4, Canada

来源：

CHEMICAL ENGINEERING SCIENCE | 2013年 / 98卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Stirred tank; Mixing; Transitional flow; Turbulence; Wall jet; Fully turbulent; PITCHED-BLADE TURBINE; 3-DIMENSIONAL WALL JETS; LASER-DOPPLER MEASUREMENTS; ENERGY-DISSIPATION; MEAN FLOW; SCALE-UP; RUSHTON TURBINE; CIRCULATION PATTERN; TRAILING VORTICES; POWER-CONSUMPTION;

D O I：

10.1016/j.ces.2013.04.039

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The limits of fully developed turbulence are defined in the wall jet and in the recirculation flow for three different impeller geometries: A310, HE3 and PBTD. At two different tank scales, mean velocity profiles in both the wall jet and the recirculation flow were measured to determine whether the condition of fully turbulent self-similarity is satisfied. Higher impeller Reynolds numbers are able to keep the flow fully turbulent higher in the tank. In addition to the expected effect of impeller Reynolds number, the fluid also affected the flow regime. Measurements in a pilot scale stirred tank gave similar results. Although the power number is often constant for Re > 20 000, an impeller Re >= 300 000 is required to keep the flow in the fully turbulent regime in the top third of the tank and in the recirculation zone. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：218 / 230

页数：13

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