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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

MEASUREMENT OF TEMPERATURE DISTRIBUTION OF HIGH PRANDTL NUMBER FLUID FLOW UNDER HIGH MAGNETIC FIELD

H. Nakaharai
Kyushu University, Japan

J. Takeuchi
University of California, USA

Takehiko Yokomine
Advanced Energy Engineering Science, Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga-kouen 6-1, Kasuga, Fukuoka 816-8580, JAPAN; Department of Nuclear Engineering, Kyoto University, Kyoto-Daigaku Kastura, Nishikyo-Ku, Kyoto, 615-8540 Japan

Tomoaki Kunugi
Department of Nuclear Engineering, Kyoto University, Kyoto Daigaku-Katsura, Nishikyo-ku, Kyoto, Japan

Shin-ichi Satake
Department of Applied Electronics, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585 Japan

Neil B. Morley
University of California, USA

Mohamed A Abdou
University of California, Los Angeles, USA

DOI: 10.1615/IHTC13.p21.170
8 pages

Abstract

The temperature distribution and Nusselt number (Nu) for high Prandtl number (Pr) turbulent pipe flow through the uniformly heated tube are measured. The objective of this study is to clarify the effect of MHD force on the heat transfer of potassium hydroxide (KOH) aqueous flow. The KOH aqueous flow is a stimulant of the molten salt flow such as FLiBe ((LiF)2-BeF2)as a candidate coolant of fusion reactor. Compared to the studies on heat transfer mechanism of liquid metal, there is a lack of data about that of high Prandtl number fluid for design of MHD devices. Therefore, it is very important for fusion R&D to estimate accurately the effect of magnetic field on heat transfer characteristic related to turbulence modulation.
When the transverse magnetic field is applied, the steep temperature gradient is observed in the near-wall region because of transition to the Hartmann flow which has a steep velocity gradient near the wall. Additionally, suppression of the temperature fluctuation is observed in the near-wall region. The mechanism of suppression is conjugated in connection with turbulence suppression due to the magnetic field by the aid of Direct Numerical Simulation (DNS) results[1][2] already published. As a result, local Nusselt number for turbulent pipe flow decreases 25% at Ha=15, Re=5000, and 15% at Ha=15, Re=20000 from the values without magnetic field.

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Measurement of fluid temperature with an arrangement of three thermocouples