Transient Heat Transfer From a Horizontal Cylinder in the LowReynoldsNumber 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 lowReynoldsnumber 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 quasisteadystate 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 quasisteadystate one was correlated as a function of Reynolds number of the gas flow and the nondimensional period of increasing heat input. For the nondimensional period larger than about 300, the transient heat transfer approaches the steadystate one, and shows no dependence onmore »
 Authors:

 Kobe University of Mercantile Marine, 511 FukaeMinamimachi, Higashinadaku, Kobe 6580022 (Japan)
 Publication Date:
 Research Org.:
 The ASME Foundation, Inc., Three Park Avenue, New York, NY 100165990 (United States)
 OSTI Identifier:
 21072910
 Resource Type:
 Conference
 Resource Relation:
 Conference: ICONE10: 10. international conference on nuclear engineering, Arlington  Virginia (United States), 1418 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; STEADYSTATE CONDITIONS; TRANSIENTS; VELOCITY
Citation Formats
Liu, Qiusheng, Fukuda, Katsuya, and Hata, Koichi. Transient Heat Transfer From a Horizontal Cylinder in the LowReynoldsNumber 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 LowReynoldsNumber Flow of Helium Gas. United States.
Liu, Qiusheng, Fukuda, Katsuya, and Hata, Koichi. Mon .
"Transient Heat Transfer From a Horizontal Cylinder in the LowReynoldsNumber Flow of Helium Gas". United States.
@article{osti_21072910,
title = {Transient Heat Transfer From a Horizontal Cylinder in the LowReynoldsNumber 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 lowReynoldsnumber 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 quasisteadystate 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 quasisteadystate one was correlated as a function of Reynolds number of the gas flow and the nondimensional period of increasing heat input. For the nondimensional period larger than about 300, the transient heat transfer approaches the steadystate 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}
}