展向磁场作用下液态金属GaInSn多层膜流实验研究
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摘要
研究在展向磁场作用下,液态金属GaInSn膜流在有机玻璃方腔多层通道中的流动特性。实验首次采用3台激光轮廓测量仪同时捕捉3个位置的液膜表面2D轮廓变化,实现液膜厚度测量。研究结果表明:在有机玻璃通道内,液膜表面波动随流动雷诺数的增大而明显增加;引入的展向磁场有效地抑制沿磁场方向的表面波动,而对沿流向的波动影响较小。在液膜平均厚度变化方面,随磁场的增强,液膜厚度在较小雷诺数时减小,在中等雷诺数时先减小后增大,在大雷诺数时单调增大。同时,磁场对流动的阻碍作用在大雷诺数下表现得较为明显。相比单层膜流实验结果,多层膜流装置有效地改善膜流铺展性,更易实现在表面的大面积铺展。
In this work, the flow characteristics of the liquid GaInSn film in the multilayer channel in the organic glass cavity under the spanwise magnetic field are studied. Three laser level instruments are used to simultaneously capture the liquid 2 D contour changes at three positions, and measure the thickness of film. The experimental results show that the surface fluctuation of the liquid film increases obviously with Reynolds number in the organic glass channel. The magnetic field effectively inhibits the surface fluctuation along the magnetic lines, but has little influence on the surface fluctuation along the streamwise direction. The thickness of the film decreases with the increase of the magnetic field at small Reynolds numbers, the thickness decreases first and then increases at the medium Reynolds numbers, and the thickness of film increases monotonically when Reynolds numbers are large. The larger Reynolds number is, the more obvious the effect of magnetic field's obstruction of the flow is. The results illustrate that the multilayer film flow device effectively improves the spreading of film flow and makes the spreading easier.
In this work, the flow characteristics of the liquid GaInSn film in the multilayer channel in the organic glass cavity under the spanwise magnetic field are studied. Three laser level instruments are used to simultaneously capture the liquid 2 D contour changes at three positions, and measure the thickness of film. The experimental results show that the surface fluctuation of the liquid film increases obviously with Reynolds number in the organic glass channel. The magnetic field effectively inhibits the surface fluctuation along the magnetic lines, but has little influence on the surface fluctuation along the streamwise direction. The thickness of the film decreases with the increase of the magnetic field at small Reynolds numbers, the thickness decreases first and then increases at the medium Reynolds numbers, and the thickness of film increases monotonically when Reynolds numbers are large. The larger Reynolds number is, the more obvious the effect of magnetic field's obstruction of the flow is. The results illustrate that the multilayer film flow device effectively improves the spreading of film flow and makes the spreading easier.
引文
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[2] Morley N B,Burris J,Cadwallader L C,et al.GaInSn usage in the research laboratory[J].Review of Scientific Instruments,2008,79(5):112-192.
[3] Morley N B,Burris J.The MTOR LM-MHD flow facility,and preliminary experimental investigation of thin layer,liquid metal flow in a 1/R toroidal magnetic field[J].Fusion Science & Technology,2003,44(1):74-78.
[4] Hsieh D.Stability of a conducting fluid flowing down an inclined plane in a magnetic field[J].Physics of Fluids,1964,8(10):1 785-1 791.
[5] Ladikov Y P.Flow stability of a conducting liquid flowing down an inclined plane in the presence of a magnetic field[J].Fluid Dynamics,1966,1(1):1-4.
[6] Li F C,Serizawa A.Experimental study on flow characteristics of a vertically falling film flow of liquid metal NaK in a transverse magnetic field[J].Fusion Engineering & Design,2004,70(2):185-199.
[7] Li F C,Kunugi T,Serizawa A.MHD effect on flow structures and heat transfer characteristics of liquid metal-gas annular flow in a vertical pipe[J].International Journal of Heat & Mass Transfer,2005,48(12):2 571-2 581.
[8] Yang J C,Qi T Y,Ni M J,et al.Flow patterns of GaInSn liquid on inclined stainless steel plate under a range of magnetic field[J].Fusion Engineering & Design,2016,s109-111:861-865.
[9] 阳倦成,齐天煜,刘佰奇,等.磁场作用下液态金属膜流铺展特性的实验研究[J].工程热物理学报,2017(9):1 917-1 922.
[10] Xu Z Y,Pan C J,Kang W S,et al.Experimental investigation on MHD instabilities of free surface jet and film flow for liquid metal Divertor/Limiter options[J].Nuclear Fusion & Plasma Physics,2006(1):152-153.
[11] Zhang X J,Pan C J,Xu Z Y.MHD stability analysis and flow controls of liquid metal free surface film flows as fusion reactor PFCs[J].Plasma Science and Technology,2016,18(12):1 204-1 214.
[12] 倪明玖,阳倦成,张杰.一种强磁场下的连续金属液膜生成装置及方法:中国,CN104078084A[P/OL].(2014-10-01) [2018-02-10].http://www.wanfangdata.com.cn/details/detail.do?_type=patent&id=CN201410345383.6.