Multi-jet gas cooling of in-beam foils or specimens: CFD predictions of the convective heat-transfer coefficient

doi:10.1051/epjconf/202022905002

Title: Multi-jet gas cooling of in-beam foils or specimens: CFD predictions of the convective heat-transfer coefficient

Abstract

An experiment was designed to investigate the possible enhancement of the convective heat-transfer coefficient by utilizing multiple, parallel jets in the cooling of a small heated surface, such as typically induced by an accelerated ion beam on a thin foil or specimen. The hot spot was provided using a small electrically heated plate. It was found that heat-transfer calculations by means of simple empirical methods based on dimensional analysis are not useful in this case and that advanced computational fluid dynamics (CFD) modelling is essential to interpret the results. It is shown that enhanced convective cooling can indeed be obtained with a multi-jet configuration as compared to a single-jet configuration but only under very selective conditions. An improperly designed multi-jet configuration can also provide significantly reduced cooling relative to the single-jet case and the estimation of the behavior of any particular jet geometry is eminently non-intuitive. CFD provides acceptable quantitative results and seem to be the only tool available to gain an understanding of these complex flows where simple models and “rules of thumb” cannot be relied upon.

Authors:

^[1]; Steyn, Gideon Francois ^[2]; Steyn, Michael ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
National Research Foundation (South Africa). iThemba LABS
Stellenbosch Univ. (South Africa)

Publication Date:: 2020-02-28

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1604023

Report Number(s):: LA-UR-18-29455
Journal ID: ISSN 2100-014X

Grant/Contract Number:: 89233218CNA000001

Resource Type:: Accepted Manuscript

Journal Name:: EPJ Web of Conferences

Additional Journal Information:: Journal Volume: 229; Conference: INTDS Conference 2018 ; 2018-10-07 - 2018-10-12 ;; Journal ID: ISSN 2100-014X

Publisher:: EDP Sciences

Country of Publication:: United States

Language:: English

Subject:: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats


                    Vermeulen, Christiaan, Steyn, Gideon Francois, and Steyn, Michael. Multi-jet gas cooling of in-beam foils or specimens: CFD predictions of the convective heat-transfer coefficient.  United States: N. p., 2020. 
        Web.  doi:10.1051/epjconf/202022905002.

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                    Vermeulen, Christiaan, Steyn, Gideon Francois, & Steyn, Michael. Multi-jet gas cooling of in-beam foils or specimens: CFD predictions of the convective heat-transfer coefficient.  United States.  doi:https://doi.org/10.1051/epjconf/202022905002

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                    Vermeulen, Christiaan, Steyn, Gideon Francois, and Steyn, Michael. Fri .  
        "Multi-jet gas cooling of in-beam foils or specimens: CFD predictions of the convective heat-transfer coefficient".  United States.  doi:https://doi.org/10.1051/epjconf/202022905002.  https://www.osti.gov/servlets/purl/1604023.

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@article{osti_1604023,

  title        = {Multi-jet gas cooling of in-beam foils or specimens: CFD predictions of the convective heat-transfer coefficient},

  author       = {Vermeulen, Christiaan and Steyn, Gideon Francois and Steyn, Michael},

  abstractNote = {An experiment was designed to investigate the possible enhancement of the convective heat-transfer coefficient by utilizing multiple, parallel jets in the cooling of a small heated surface, such as typically induced by an accelerated ion beam on a thin foil or specimen. The hot spot was provided using a small electrically heated plate. It was found that heat-transfer calculations by means of simple empirical methods based on dimensional analysis are not useful in this case and that advanced computational fluid dynamics (CFD) modelling is essential to interpret the results. It is shown that enhanced convective cooling can indeed be obtained with a multi-jet configuration as compared to a single-jet configuration but only under very selective conditions. An improperly designed multi-jet configuration can also provide significantly reduced cooling relative to the single-jet case and the estimation of the behavior of any particular jet geometry is eminently non-intuitive. CFD provides acceptable quantitative results and seem to be the only tool available to gain an understanding of these complex flows where simple models and “rules of thumb” cannot be relied upon.},

  doi          = {10.1051/epjconf/202022905002},

  journal      = {EPJ Web of Conferences},

  number       = ,

  volume       = 229,

  place        = {United States},

  year         = {2020},

  month        = {2}

}

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DOI: https://doi.org/10.1051/epjconf/202022905002

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Works referenced in this record:

Flow structure, wall pressure and heat transfer characteristics of impinging annular jet with/without steady swirling
journal, September 2010

Yang, H. Q.; Kim, T.; Lu, T. J.
International Journal of Heat and Mass Transfer, Vol. 53, Issue 19-20
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Forced convective heat transfer by swirling impinging jets issuing from nozzles equipped with twisted tapes
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Nanan, K.; Wongcharee, K.; Nuntadusit, C.
International Communications in Heat and Mass Transfer, Vol. 39, Issue 6
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Heat Transfer by a Square Array of Round Air Jets Impinging Perpendicular to a Flat Surface Including the Effect of Spent Air
journal, January 1970

Kercher, D. M.; Tabakoff, W.
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Single-jet gas cooling of in-beam foils or specimens: Prediction of the convective heat-transfer coefficient
conference, January 2018

Steyn, Gideon; Vermeulen, Christiaan
PROCEEDINGS OF THE 28TH WORLD CONFERENCE OF THE INTERNATIONAL NUCLEAR TARGET DEVELOPMENT SOCIETY (INTDS2016), AIP Conference Proceedings
DOI: 10.1063/1.5035537

Confined single- and multiple-jet impingement heat transfer—I. Turbulent submerged liquid jets
journal, March 1995

Chang, C. T.; Kojasoy, G.; Landis, F.
International Journal of Heat and Mass Transfer, Vol. 38, Issue 5
DOI: 10.1016/0017-9310(94)00202-7

Convective heat transfer by a row of confined air jets from round holes equipped with triangular tabs
journal, May 2014

Yu, Ye-zheng; Zhang, Jing-zhou; Xu, Hua-sheng
International Journal of Heat and Mass Transfer, Vol. 72
DOI: 10.1016/j.ijheatmasstransfer.2014.01.004

Convective heat transfer for multiple rows of impinging air jets with small jet-to-jet spacing in a semi-confined channel
journal, July 2015

Yong, Shan; Jing-zhou, Zhang; Gong-nan, Xie
International Journal of Heat and Mass Transfer, Vol. 86
DOI: 10.1016/j.ijheatmasstransfer.2015.03.073

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Similar Records

Title: Multi-jet gas cooling of in-beam foils or specimens: CFD predictions of the convective heat-transfer coefficient

Abstract

Citation Formats

Flow structure, wall pressure and heat transfer characteristics of impinging annular jet with/without steady swirling journal, September 2010

Forced convective heat transfer by swirling impinging jets issuing from nozzles equipped with twisted tapes journal, July 2012

Heat Transfer by a Square Array of Round Air Jets Impinging Perpendicular to a Flat Surface Including the Effect of Spent Air journal, January 1970

Single-jet gas cooling of in-beam foils or specimens: Prediction of the convective heat-transfer coefficient conference, January 2018

Confined single- and multiple-jet impingement heat transfer—I. Turbulent submerged liquid jets journal, March 1995

Convective heat transfer by a row of confined air jets from round holes equipped with triangular tabs journal, May 2014

Convective heat transfer for multiple rows of impinging air jets with small jet-to-jet spacing in a semi-confined channel journal, July 2015

Flow structure, wall pressure and heat transfer characteristics of impinging annular jet with/without steady swirling
journal, September 2010

Forced convective heat transfer by swirling impinging jets issuing from nozzles equipped with twisted tapes
journal, July 2012

Heat Transfer by a Square Array of Round Air Jets Impinging Perpendicular to a Flat Surface Including the Effect of Spent Air
journal, January 1970

Single-jet gas cooling of in-beam foils or specimens: Prediction of the convective heat-transfer coefficient
conference, January 2018

Confined single- and multiple-jet impingement heat transfer—I. Turbulent submerged liquid jets
journal, March 1995

Convective heat transfer by a row of confined air jets from round holes equipped with triangular tabs
journal, May 2014

Convective heat transfer for multiple rows of impinging air jets with small jet-to-jet spacing in a semi-confined channel
journal, July 2015