Share

IIR document

Assessment of partial wetting characteristics in horizontal tube falling film absorbers using fluorescent uranine.

Number: 0181

Author(s) : OKAMOTO R., GIANNETTI N., HACHIYA M., JEONG J., SAITO K.

Summary

The complex intertube hydrodynamics, including jets or droplet formation, fall and impact, within falling film absorbers poses a challenge in the theoretical estimation of the film wetting behaviour within this heat and mass exchanger. Therefore, the experimental assessment of such wetting characteristics is essential for the development of models with higher prediction accuracy.
This study presents a direct visualization technique, which relies on the use of fluorescent uranine for a clear estimation of both local and global wetting characteristics. A post processing procedure of the recorded images is devised for providing a quantitative description of the results as well as a detailed phenomenological representation of intertube characteristics and film thickness variations. Preliminary results of water on horizontal copper tubes, in a wetting-dewetting cycle ranging up to 0.12kg/m/s, portrayed the corresponding wetting hysteresis characteristics, which are critical for a proper design and operation of the absorber.

Available documents

Format PDF

Pages: 10 p.

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Assessment of partial wetting characteristics in horizontal tube falling film absorbers using fluorescent uranine.
  • Record ID : 30029765
  • Languages: English
  • Subject: Technology
  • Source: 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings. Trondheim, Norway, June 13-15th 2022.
  • Publication date: 2022/06/13
  • DOI: http://dx.doi.org/10.18462/iir.gl2022.0181
  • Document available for consultation in the library of the IIR headquarters only.

Links


See other articles from the proceedings (169)
See the conference proceedings

Indexing