WJNST  Vol.4 No.2 , April 2014
Superficial Layer MHD Effect and Full-Cover Free Surface Flow Characterizing

Up to now, no a real full-cover liquid metal (LM) free surface flow have been successfully used in magnetic fusion devices as MHD instability and unavoidable rivulet flow. Recently, after we carried out a guidable free curve-surface flow on theoretically and experimentally, seeking for other way to get a full-cover free surface flow is also in implementing. The superficial layer MHD effect in free surface flow is experimentally observed. After compared and analyzed the characteristic parameters of the free surface flow, the conditions of full-cover free surface flow are found. Meanwhile, the new two parameters of surface cover ratio and rivulet flow index are introduced to characterize the flowing characteristic of the full-cover free surface flow under magnetic field. According to the analysis rule, for different liquid metal, there are the different unique conditions to meet full-cover free surface flow under magnetic field. This may be a way to solve free surface flow major MHD key issue for LM PFCs.

Cite this paper
Xu, Z. , Pan, C. , Zhang, X. and Chen, J. (2014) Superficial Layer MHD Effect and Full-Cover Free Surface Flow Characterizing. World Journal of Nuclear Science and Technology, 4, 65-72. doi: 10.4236/wjnst.2014.42011.
[1]   Bucenieks, I., Lielausis, O., Platacis, E. and Shishko, A. (1994) Experimantal Study of Liquid Metal Film and Jet Flows in a Strong Magnetic Field. Magnetohydrodynamics, 30, 219-230.

[2]   Muraviev, E.V. (1997) MHD Film Flow Model for Tokamak Reactor Diverter Plates. Magnetohydrodynamics, 33, 475-479.

[3]   Mattas, R.F. (2000) ALPS Team ALPS—Advanced Limiter-Divertor Plasma-Facing System. Fusion Engineering and Design, 51-52, 127-134. http://dx.doi.org/10.1016/S0920-3796(00)00385-9

[4]   Abdou, M.A. (2001) The APEX TEAM, on the Exploration of Innovative Concepts for Fusion Chamber Technology. Fusion Engineering and Design, 54, 181-247. http://dx.doi.org/10.1016/S0920-3796(00)00433-6

[5]   Aleksandrova, S., Molokov, S. and Reed, C.B. (2002) Modelling of Liquid Metal Duct and Free-Surface Flows Using CFX. Report Number(s)-ANL/TD/TM02-30 TRN: US0300347.

[6]   Ying, A.Y., Abdou, M.A., Morley, N., Sketchley, T., et al. (2004) Exploratory Studies of Flowing Liquid Metal Divertor Options for Fusion-Relevant Magnetic Fields in the MTOR Facility. Fusion Engineering and Design, 72, 35-62.

[7]   Morley, N.B., Smolentsev, S., Munipalli, R., Ni, M.-J., Gao, D. and Abdou, M. (2004) Progress on the Modeling of Liquid Metal Free Surface MHD Flows for Fusion Liquid Walls. Fusion Engineering and Design, 72, 3-34.

[8]   Tanaka, T.J., Bauer, F.J., Lutz, T.J., McDonald, J.M., et al. (2004) Liquid Metal Integrated Test System (LIMITS). Engineering and Design, 72, 83-92.

[9]   Allain, J.P., Nieto, M., Coventry, M.D., Stubbers, R. and Ruzic, D.N. (2004) Studies of Liquid-Metal Erosion and Free Surface Flowing Liquid Lithium Retention of Helium at the University of Illinois. Engineering and Design, 72, 93-110.

[10]   Whyte, D.G., Evans, T.E., Wong, C.P.C., West, W.P., Bastasz, R., Allain, J.P. and Brooks, J.N. (2004) Experimental Observations of Lithium as a Plasma-Facing Surface in the DIII-D Tokamak Divertor. Engineering and Design, 72, 133-147.

[11]   Xu, Z.Y., Pan, C.J. and Kang, W.S. (2004) Experimental Observation and Theoretic Analysis MHD Effects of a Liquid Metal Jet in a Gradient Magnetic Field. Fusion Science and Technology, 46, 577-585.

[12]   Nygren, R.E., Harjes, H.C., Wakeland, P., Ellis, R., et al. (2009) Thermal Control of the Liquid Lithium Divertor for NSTX. Fusion Engineering and Design, 84, 1438-1441. http://dx.doi.org/10.1016/j.fusengdes.2008.11.098

[13]   Vertkov, A.V., Lyublinski, I.E., Tabares, F. and Ascasibar, E. (2012) Status and Prospect of the Development of Liquid Lithium Limiters for Stellarotor TJ-II. Fusion Engineering and Design, 87, 1755-1759.

[14]   Apicella, M.L., Lazarev, V., Lyublinski, I., Mazzitelli, G., et al. (2009) Lithium Capillary Porous System Behavior as PFM in FTU Tokamak Experiments. Journal of Nuclear Materials, 386-388, 821-823.

[15]   Lyublinski, I., Vertkov, A., Evtikhin, V., Balakirev, V., et al. (2012) Module of Lithium Divertor for KTM Tokamak. Fusion Engineering and Design, 87, 1719-1723. http://dx.doi.org/10.1016/j.fusengdes.2011.07.012

[16]   Kugela, H.W., Allain, J.P., Bell, M.G., Bell, R.E., et al. (2012) NSTX Plasma Operation with a Liquid Lithium Divertor. Fusion Engineering and Design, 87, 1724-1731.

[17]   Xu, Z.Y., Zhang, X.J., Pan, C.J., Liu, B., et al. (2013) Analysis and Primary Experiment Results of a Guidable Free Curve-Surface Flow for Liquid Metal PFCs. Advances and Applications in Fluid Mechanics, 13, 141-155.

[18]   Molokov, S. and Reed, C.B. (2000) Review of Free-Surface MHD Experiments and Modeling. ANL0TD0TM99-08, Argonne National Laboratory (Unpublished).