Wassenberg, Joern R. ; Stephan, Peter ; Gambaryan-Roisman, Tatiana (2020):
Heat transfer during pulsating liquid jet impingement onto a vertical wall.
In: Heat and Mass Transfer, 2020, Springer, ISSN 09477411, e-ISSN 14321181,
DOI: 10.1007/s00231-020-02973-z,
[Article]
Abstract
Liquid jet impingement is used for cooling and cleaning in various industrial branches. The advantages of jet impingement include high heat and mass transport rates in the vicinity of the impingement point. Pulsating liquid jets impinging on horizontal substrates with a pulsation frequency around 100 Hz have been shown to increase the cooling efficiency in comparison to jets with continuous mass flow rates. The influence of jet pulsation on cooling efficiency for impingement of horizontal jets onto vertical walls has not yet been investigated. In the case of a vertical heated wall, gravity contributes to the liquid flow pattern. In particular, if the time span between two pulses is sufficiently long, the liquid drainage from the region above the impingement point can contribute to heat transport without increasing the average flow rate of the cooling medium. In this work, the influence of pulsations on heat transfer during impingement of a horizontal liquid jet onto a vertical wall is investigated experimentally for the pulsation frequency range 1-5 Hz. The results regarding increase of heat transfer efficiency are related to flow patterns developing by impingement of successive pulses, as well as to the liquid splattering.
| Item Type: | Article |
|---|---|
| Erschienen: | 2020 |
| Creators: | Wassenberg, Joern R. ; Stephan, Peter ; Gambaryan-Roisman, Tatiana |
| Title: | Heat transfer during pulsating liquid jet impingement onto a vertical wall |
| Language: | English |
| Abstract: | Liquid jet impingement is used for cooling and cleaning in various industrial branches. The advantages of jet impingement include high heat and mass transport rates in the vicinity of the impingement point. Pulsating liquid jets impinging on horizontal substrates with a pulsation frequency around 100 Hz have been shown to increase the cooling efficiency in comparison to jets with continuous mass flow rates. The influence of jet pulsation on cooling efficiency for impingement of horizontal jets onto vertical walls has not yet been investigated. In the case of a vertical heated wall, gravity contributes to the liquid flow pattern. In particular, if the time span between two pulses is sufficiently long, the liquid drainage from the region above the impingement point can contribute to heat transport without increasing the average flow rate of the cooling medium. In this work, the influence of pulsations on heat transfer during impingement of a horizontal liquid jet onto a vertical wall is investigated experimentally for the pulsation frequency range 1-5 Hz. The results regarding increase of heat transfer efficiency are related to flow patterns developing by impingement of successive pulses, as well as to the liquid splattering. |
| Journal or Publication Title: | Heat and Mass Transfer |
| Journal volume: | 2020 |
| Place of Publication: | ONE NEW YORK PLAZA, SUITE 4600, NEW YORK, NY, UNITED STATES |
| Publisher: | Springer |
| Divisions: | 16 Department of Mechanical Engineering 16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD) |
| Event Location: | ONE NEW YORK PLAZA, SUITE 4600, NEW YORK, NY, UNITED STATES |
| Date Deposited: | 11 Dec 2020 07:06 |
| DOI: | 10.1007/s00231-020-02973-z |
| Official URL: | https://link.springer.com/article/10.1007/s00231-020-02973-z... |
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