DRAG COEFFICIENTS OF EVAPORATING SPHERES IN A TURBULENT AIR STREAM

被引：11

作者：

CLAMEN, A

GAUVIN, WH

机构：

[1] Department of Chemical Engineering, McGill University and Pulp and Paper Research Institute of Canada, Montreal, Quebec

[2] ESSO Research & Engineering Company, Process Research Division, Linden, New Jersey

[3] Noranda Research Centre, Pointe Claire, Quebec

来源：

CANADIAN JOURNAL OF CHEMICAL ENGINEERING | 1968年 / 46卷 / 02期

关键词：

D O I：

10.1002/cjce.5450460201

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A study was made to determine the effect of mass transfer on the drag coefficients of freely‐moving aerodynamically smooth spheres, accelerating in a co‐current turbulent air stream. The particles consisted of celite impregnated with liquid sulphur dioxide and varied in diameter from 0.184 to 0.989‐inch. Accurate time‐distance data were obtained with a new particle‐tracking technique which allowed the quantitative measurement of drag coefficients for relative turbulence intensities varying from 5 to 30%. The range of Reynolds numbers studied was from 2100 to 29,800, which, because of the effect of free‐stream turbulence, forms a part of the super‐critical flow regime. The results have thus been compared with the previously reported drag data for solid non‐evaporating spheres in a similar flow region. Mass transfer was found, in general, to decrease the super‐critical drag on a sphere and to reduce the influence of relative turbulence intensity. This alteration in momentum transfer is probably due to a reduction in the skin friction and to a pressure increase in the wake of an evaporating sphere. Copyright © 1968 Canadian Society for Chemical Engineering

引用

页码：73 / +

页数：1

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