SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2019, Vol. 27 ›› Issue (1): 1-9.DOI: 10.1016/j.cjche.2018.03.015

• Fluid Dynamics and Transport Phenomena •     Next Articles

Experimental investigation on flow characteristics in circular tube inserted with rotor-assembled strand using PIV

Lichen He, Weimin Yang, Changfeng Guan, Hua Yan, Lin Zheng, Xiahua Zuo   

  1. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2017-12-09 Revised:2018-03-26 Online:2019-01-31 Published:2019-01-28
  • Contact: Hua Yan
  • Supported by:

    Supported by the National Natural Science Foundation of China (51576012).

Experimental investigation on flow characteristics in circular tube inserted with rotor-assembled strand using PIV

Lichen He, Weimin Yang, Changfeng Guan, Hua Yan, Lin Zheng, Xiahua Zuo   

  1. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • 通讯作者: Hua Yan
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51576012).

Abstract: Rotor-assembled strand works as a typical tube insert to achieve heat transfer augmentation and scale inhibition in a heat exchanger. In this work, the PIV experiment regarding the flow fields in a circular tube inserted with rotor-assembled strand was conducted and the flow characteristics on transverse section and longitudinal section were analyzed. The results showed that swirling flow was produced in the tube inserted with rotors and it was particularly strong within the swing diameter of the rotor on the section that contains the rotor; the average turbulence intensity and the radial velocity were improved notably; the velocity vectors on the longitudinal section remained along the direction of a straight line; both the swirling flow and average turbulence intensity were higher for the rotor with three blades than for the rotor with two blades except that the radial velocity was approximate, but they were all reduced by enlarging the lead of the rotor. Characterization of the flow patterns in a circular tube contributes to understanding the heat transfer efficiency and scale inhibition performance of the rotor-assembled strand and provides guidance for its application.

Key words: Particle image velocimetry (PIV), Swirling flow, Rotor-assembled strand, Circular tube

摘要: Rotor-assembled strand works as a typical tube insert to achieve heat transfer augmentation and scale inhibition in a heat exchanger. In this work, the PIV experiment regarding the flow fields in a circular tube inserted with rotor-assembled strand was conducted and the flow characteristics on transverse section and longitudinal section were analyzed. The results showed that swirling flow was produced in the tube inserted with rotors and it was particularly strong within the swing diameter of the rotor on the section that contains the rotor; the average turbulence intensity and the radial velocity were improved notably; the velocity vectors on the longitudinal section remained along the direction of a straight line; both the swirling flow and average turbulence intensity were higher for the rotor with three blades than for the rotor with two blades except that the radial velocity was approximate, but they were all reduced by enlarging the lead of the rotor. Characterization of the flow patterns in a circular tube contributes to understanding the heat transfer efficiency and scale inhibition performance of the rotor-assembled strand and provides guidance for its application.

关键词: Particle image velocimetry (PIV), Swirling flow, Rotor-assembled strand, Circular tube