Universal Expression of Tangential Velocity Distribution near Side Wall of a Fully Turbulent Agitated Vessel without Baffles

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Katsumi Shiobara⁴  Shuichi Iwata³  Takao Yamaguchi¹  Yutaka Tada³  Masaaki Yamamura²  Setsuro Hiraoka³  Yoshihito Kato³ 

[1] Department of Mechanical Engineering, Chubu University;Department of Information Processing Education, Chubu University;Department of Applied Chemistry, Nagoya Institute of Technology;Tokyo Office, Satake Chemical Equipment Mfg., Ltd.

关键词: Agitated Vessel;    Paddle Impeller;    Tangential Velocity;    Universal Velocity Distribution;    Mixing Length;   

DOI  :  10.1252/jcej.40.666

来源: Maruzen Company Ltd

【 摘 要 】

References(11)Cited-By(2)For the turbulent boundary layer at the side wall of an agitated vessel without baffles, new dimensionless variables u++ and y++ were derived as uθ+(βD/1.7d) and y+(βD/1.7d), respectively, instead of the dimensionless variables uθ+ and y+ in the universal velocity distribution law. The correlation of the measured tangential velocity at the side wall of an agitated vessel without baffles with u++ and y++ satisfied the logarithmic expression of the universal velocity distribution law in the range 20 < y++ < 70 for the paddle impeller having a larger value of the impeller similarity parameter than 0.1. This meant that the mixing length for an agitated vessel was βD/1.7d times that for a flat plate. Besides the tangential velocity at the turbulent boundary layer edge uD and the boundary layer thickness yD were roughly expressed as 0.85(d/D)UD and 0.030(1.7d/βD)L, respectively.

【 授权许可】

Unknown