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Title: Transient Heat Transfer From a Horizontal Cylinder in the Low-Reynolds-Number Flow of Helium Gas

Abstract

The knowledge of forced convection transient heat transfer at various periods of exponentially increasing heat input to a heater is important as a database for understanding the transient heat transfer process in a high temperature gas cooled reactor (HTGR) due to an accident in excess reactivity. In this study, the transient heat transfer coefficients for Helium gas flowing perpendicular to a horizontal cylinder were measured in the low-Reynolds-number region. The platinum heater with a diameter of 1.0 mm was heated by electric current with an exponentially increasing heat input of Q{sub 0}exp(t/t). It was clarified that the heat transfer coefficient approaches the quasi-steady-state one for the period t over around 1 s, and it becomes higher for the period of t shorter than about 1 s. The transient heat transfer shows less dependent on the gas flowing velocity when the period becomes very short. Based on the experimental data, the ratio of transient heat transfer to the quasi-steady-state one was correlated as a function of Reynolds number of the gas flow and the non-dimensional period of increasing heat input. For the non-dimensional period larger than about 300, the transient heat transfer approaches the steady-state one, and shows no dependence onmore » the Reynolds number. (authors)« less

Authors:
; ;  [1]
  1. Kobe University of Mercantile Marine, 5-1-1 Fukae-Minami-machi, Higashinada-ku, Kobe 658-0022 (Japan)
Publication Date:
Research Org.:
The ASME Foundation, Inc., Three Park Avenue, New York, NY 10016-5990 (United States)
OSTI Identifier:
21072910
Resource Type:
Conference
Resource Relation:
Conference: ICONE-10: 10. international conference on nuclear engineering, Arlington - Virginia (United States), 14-18 Apr 2002; Other Information: Country of input: France
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ACCIDENTS; AUGMENTATION; CYLINDERS; ELECTRIC CURRENTS; FORCED CONVECTION; GAS FLOW; HEAT; HEATERS; HELIUM; HTGR TYPE REACTORS; REACTIVITY; REYNOLDS NUMBER; STEADY-STATE CONDITIONS; TRANSIENTS; VELOCITY

Citation Formats

Liu, Qiusheng, Fukuda, Katsuya, and Hata, Koichi. Transient Heat Transfer From a Horizontal Cylinder in the Low-Reynolds-Number Flow of Helium Gas. United States: N. p., 2002. Web.
Liu, Qiusheng, Fukuda, Katsuya, & Hata, Koichi. Transient Heat Transfer From a Horizontal Cylinder in the Low-Reynolds-Number Flow of Helium Gas. United States.
Liu, Qiusheng, Fukuda, Katsuya, and Hata, Koichi. Mon . "Transient Heat Transfer From a Horizontal Cylinder in the Low-Reynolds-Number Flow of Helium Gas". United States.
@article{osti_21072910,
title = {Transient Heat Transfer From a Horizontal Cylinder in the Low-Reynolds-Number Flow of Helium Gas},
author = {Liu, Qiusheng and Fukuda, Katsuya and Hata, Koichi},
abstractNote = {The knowledge of forced convection transient heat transfer at various periods of exponentially increasing heat input to a heater is important as a database for understanding the transient heat transfer process in a high temperature gas cooled reactor (HTGR) due to an accident in excess reactivity. In this study, the transient heat transfer coefficients for Helium gas flowing perpendicular to a horizontal cylinder were measured in the low-Reynolds-number region. The platinum heater with a diameter of 1.0 mm was heated by electric current with an exponentially increasing heat input of Q{sub 0}exp(t/t). It was clarified that the heat transfer coefficient approaches the quasi-steady-state one for the period t over around 1 s, and it becomes higher for the period of t shorter than about 1 s. The transient heat transfer shows less dependent on the gas flowing velocity when the period becomes very short. Based on the experimental data, the ratio of transient heat transfer to the quasi-steady-state one was correlated as a function of Reynolds number of the gas flow and the non-dimensional period of increasing heat input. For the non-dimensional period larger than about 300, the transient heat transfer approaches the steady-state one, and shows no dependence on the Reynolds number. (authors)},
doi = {},
url = {https://www.osti.gov/biblio/21072910}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {7}
}

Conference:
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