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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:
ORCiD logo [1];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. National Research Foundation (South Africa). iThemba LABS
  3. Stellenbosch Univ. (South Africa)
Publication Date:
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.
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
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.
@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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Works referenced in this record:

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