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Use of turbulence modification for heat transfer enhancement in liquid metal blankets

H Branover, A Eidelman, M Nagorny1995年Fusion Engineering and DesignIF 1.7出版社

AbstractHeat transfer intensification in the process of liquid metal flow in a magnetic field represents a rather important problem in connection with fusion reactors. In this paper we present a review of experimental investigations carried out in this direction during the last decade at the Centre for MHD Studies of Ben-Gurion University. We have studied the influence of the transverse magnetic field on turbulence in mercury flow with various turbulizers. In certain cases a jump-wise growth in fluctuation intensity with magnetic field is observed. This leads to the enhancement of heat transfer from the wall. Recently heat diffusion processes in two-dimensional turbulent flows have been studied in experiments with thin (0.5 mm) heated grids. A considerable increase in velocity fluctuation intensity is observed behind such grids in the low temperature portion of the spectrum. Here the type of temperature fluctuation spectrum depends on the magnetic field value. The temperature fluctuation intensity decreases in fields of the order of 0.5 T, while a further field increase leads to its enhancement.

日本語訳

磁場中の液体金属流における熱伝達促進は、核融合炉に関連してかなり重要な問題である。本論文では、ベン・グリオン大学MHD研究センターにおいて過去10年間にこの方向で行われた実験的研究のレビューを提示する。我々は、様々な乱流促進体を備えた水銀中の乱流に対する横磁場の影響を研究した。特定の条件下では、磁場の増加に伴う変動強度の跳躍的増大が観察される。これは壁からの熱伝達の促進につながる。最近では、薄い(0.5 mm)加熱グリッドを用いた二次元乱流中の熱拡散過程が研究されている。このようなグリッドの下流では、低周波数領域において速度変動強度の顕著な増加が観察される。ここで、温度変動スペクトルの種類は磁場の値に依存する。温度変動強度は0.5 T程度の磁場では減少するが、さらに磁場を増加させると増強につながる。

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