Experimental study and numerical simulation on falling film thickness outside a horizontal tube

Maogang He, Hualiang Fan, Xiaofei Wang, Kai Lü

Research output: Contribution to journalArticlepeer-review

Abstract

The measurement of the falling film thickness outside a horizontal tube of a falling film evaporator was performed with the laser induced fluorescence method and the image processing technique. The influences of feeder height, flow rate, and surface geometry configuration on the falling film thickness were explored during the subcooled liquid flowing outside a horizontal plain tube and a Turbo-CII tube at the ambient temperature and pressure. The two-dimension simulation on the water film flow around a plain tube was conducted with the Fluent, and the calculation results were compared with the experimental data. The results show that the film thickness at the upper semi-circular is greater than that at the lower semi-circular. Moreover, it decreases with the increase in the angle in the clockwise direction at the upper semi-circular, and changes slightly at the lower semi-circular. Further, the smallest value of the film thickness is near the 90° location at the lower semi-circular, and the film thickness increases with the increase in Re value and decreases with the increase in the feeder height. In addition, the film wave is stronger at the upper semi-circular, and the wave on the Turbo-CII tube is weaker than that on the plain tube.

Original languageEnglish (US)
Pages (from-to)1-5
Number of pages5
JournalHsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
Volume44
Issue number9
StatePublished - Sep 1 2010
Externally publishedYes

Keywords

  • Film thickness measurement
  • Horizontal tube
  • Laser induced fluorescence method
  • Numerical simulation

ASJC Scopus subject areas

  • Engineering(all)

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