Buoyancy effects in vertical rectangular duct with coplanar magnetic field and single sided heat load. (October 2017)

• Record Type: Journal Article
• Authors: Kostichev, P I; Poddubnyi, I I; Razuvanov, N G
• Is Part Of: Journal of physics. Volume 891(2017)
• Publication Date: 2017-10
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/891/1/012072
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: In some DEMO blanket designs liquid metal flows in vertical ducts of rectangular cross-section between ceramic breeder units providing their cooling. Heat exchange in these conditions is governed by the influence of magnetic field (coplanar) and by buoyancy effects that depend on the flow orientation to the gravity vector (downward and upward flow). Magnetohydrodynamic and heat transfer of liquid metal in vertical rectangular ducts is not well researched. Experimental study of buoyancy effects in rectangular duct with coplanar magnetic field for one-sided heat load and downward and upward flowsis presented in this paper. The detail research with has been done on mercury MHD close loop with using of the probe technique allow to discover several advantageous and disadvantageous effects. The intensive impact of buoyancy force has been observed in a few regime of downward flow which has been laminarized by magnetic field. Due to the development in the flow of the secondary large-scale vortices heat transfer improved and the temperature fluctuations of the abnormally high intensity have been fixed. On the contrary, in the upward flow the buoyancy force stabilized the flow which lead to decreasing of the turbulence heat transfer ratio and, consequently, deterioration of heat transfer.