This study is aimed to clarify transient heat transfer process between the surface of solid and the neighboring helium gas in Very High Temperature Reactor (VHTR) or intermediate heat exchanger (IHX). In this paper a series of platinum heaters with different widths under different pressures inside a circular channel have been tested for forced convection flow. The heat generation rate of the platinum heater was increased with a function of Q0exp(t/τ) (where t is time and τ is period of heat generation rate or e-fold time). The heaters were platinum plates with a thickness of 0.1 mm and widths of 2 mm, 4 mm and 6 mm. In the present study, the heat flux, surface temperature, and transient heat transfer coefficients were measured for helium gas passing by horizontal plates under wide experimental conditions such as velocities, pressures and periods of heat generation rate. It was clarified that the heat transfer coefficient approaches the quasi-steady-state when the period is more than around 1 s and it becomes higher when the period shorter than around 1 s. Based on the experimental data, empirical correlations for both quasi-steady-state heat transfer and transient state one at various plate-widths were obtained. It was also found that the heat transfer coefficient becomes higher with the increases of gas pressure.
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2013 21st International Conference on Nuclear Engineering
July 29–August 2, 2013
Chengdu, China
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5583-6
PROCEEDINGS PAPER
Transient Heat Transfer for Helium Gas Flowing Over a Horizontal Flat-Plate With Different Widths Available to Purchase
Qiusheng Liu,
Qiusheng Liu
Kobe University, Kobe, Hyogo, Japan
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Katsuya Fukuda
Katsuya Fukuda
Kobe University, Kobe, Hyogo, Japan
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Zhou Zhao
Kobe University, Kobe, Hyogo, Japan
Qiusheng Liu
Kobe University, Kobe, Hyogo, Japan
Katsuya Fukuda
Kobe University, Kobe, Hyogo, Japan
Paper No:
ICONE21-15303, V006T16A009; 9 pages
Published Online:
February 7, 2014
Citation
Zhao, Z, Liu, Q, & Fukuda, K. "Transient Heat Transfer for Helium Gas Flowing Over a Horizontal Flat-Plate With Different Widths." Proceedings of the 2013 21st International Conference on Nuclear Engineering. Volume 6: Beyond Design Basis Events; Student Paper Competition. Chengdu, China. July 29–August 2, 2013. V006T16A009. ASME. https://doi.org/10.1115/ICONE21-15303
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