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The influence of splattering on the development of the wall film after horizontal jet impingement onto a vertical wall

Wassenberg, Joern R. and Stephan, Peter and Gambaryan-Roisman, Tatiana (2019):
The influence of splattering on the development of the wall film after horizontal jet impingement onto a vertical wall.
60, In: Experiments in Fluids, (11), p. 173. Springer, ISSN 0723-4864, e-ISSN 1432-1114,
DOI: 10.1007/s00348-019-2810-6,
[Article]

Abstract

Liquid jet impingement is used in industries for cleaning or cooling the surfaces, since this process is characterized by high heat or mass transport rates. The impinging jet spreads radially outwards and creates a wall film flow, which is bounded by a hydraulic jump. The existing models describing the extent of the radial flow zone and the position of hydraulic jump are only applicable for small nozzle-to-target distances and low flow rates. In this work, the model is extended to include the effect of splattering liquid, which may reduce the extent of the radial flow zone considerably. The splattering in combination with the hydraulic jump position is investigated experimentally for a liquid jet impinging horizontally onto a vertical wall. In addition, the high-speed images of the jet and of the impingement region provide further insight into the splattering mechanisms. It is found that for large nozzle-to-target distances the splattered mass fraction is determined only by the jet Weber number. The hydraulic jump position can be predicted using the extended model with deviations of less than 20% in this region.

Item Type: Article
Erschienen: 2019
Creators: Wassenberg, Joern R. and Stephan, Peter and Gambaryan-Roisman, Tatiana
Title: The influence of splattering on the development of the wall film after horizontal jet impingement onto a vertical wall
Language: English
Abstract:

Liquid jet impingement is used in industries for cleaning or cooling the surfaces, since this process is characterized by high heat or mass transport rates. The impinging jet spreads radially outwards and creates a wall film flow, which is bounded by a hydraulic jump. The existing models describing the extent of the radial flow zone and the position of hydraulic jump are only applicable for small nozzle-to-target distances and low flow rates. In this work, the model is extended to include the effect of splattering liquid, which may reduce the extent of the radial flow zone considerably. The splattering in combination with the hydraulic jump position is investigated experimentally for a liquid jet impinging horizontally onto a vertical wall. In addition, the high-speed images of the jet and of the impingement region provide further insight into the splattering mechanisms. It is found that for large nozzle-to-target distances the splattered mass fraction is determined only by the jet Weber number. The hydraulic jump position can be predicted using the extended model with deviations of less than 20% in this region.

Journal or Publication Title: Experiments in Fluids
Volume: 60
Number: 11
Place of Publication: 233 SPRING ST, NEW YORK, NY 10013 USA
Publisher: Springer
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Event Location: 233 SPRING ST, NEW YORK, NY 10013 USA
Date Deposited: 19 Dec 2019 09:11
DOI: 10.1007/s00348-019-2810-6
Official URL: https://doi.org/10.1007/s00348-019-2810-6
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