Experimental study on the lithium film flow in the spanwise magnetic field

Liu, Bai-Qi; Yang, Juan-Cheng; Qi, Tianyu; Ren, Dong-Wei; Zhang, Jie; Ni, Ming-Jiu

doi:10.1016/j.fusengdes.2018.03.011

Cited by 8 publications

(3 citation statements)

References 8 publications

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“…To validate the IFMIF (International Fusion Materials Irradiation Facility) liquid lithium target, flow characteristics such as flow velocity, and the surface fluctuations of a liquid lithium jet, were measured [17]. We have built a liquid lithium loop, which includes a replaceable test section, to study the influence of the horizontal magnetic field on a high temperature lithium film flow, and observed the stagnant flow of liquid lithium film which is induced by the magnetic field, from a high-speed camera [27]. However, by adopting other modeling liquids such as mercury, a GaInSn ternary alloy, or NaK, which are easily available in the Lab, as the working liquid for experiments, quantitative film thickness data can be obtained using a high-speed camera, height probes, a laser method, an ultrasonic method, etc.…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic effects on liquid metal film flowing along an inclined plate relating to plasma facing components

Yang

Ren

et al. 2020

Nucl. Fusion

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The liquid metal film plasma facing component (PFC) is considered to be one of the most promising ways to realize a PFC capbable of operating for long periods. However, in the presence of a magnetic field, magnetohydrodynamic effects appearing in the liquid metal film flow directly influence the reliability of the flowing liquid metal limiter or divertor. In the present study, we consider the influence of flow rate, transverse magnetic field, and inclination angle, and conduct experiments on a liquid metal film flowing along an inclined conducting stainless steel plate. A laser profilometer (LP) and a high-speed camera are respectively adopted to obtain the local film thickness quantitatively, and its free surface structures qualitatively. We observe the magnetohydrodynamic effects of liquid metal film flow, such as the nonmonotonic change of film thickness, the reduction of film flow velocity, and the weakening of free surface waves in the direction of magnetic lines. Moreover, the film thickness increases with an increasing flow rate, whereas it decreases with an increasing inclination angle at a constant value of the magnetic field. When plotting the relative film thickening δ en, and the reduction of flow velocity against the Stuart number N, we find that there is a critical N, N cr ≈ 0.1, at which δ en begins to increase dramatically. The δ en sinβ with 1 • ≤ β ≤ 5 • , based on all of the experimental data, collapses into one line, which can be scaled as δ en sinβ ∼ N. The present experimental data and its scaling law may prove useful for estimating magnetohydrodynamic effects on liquid metal film flows when considering the design of liquid metal film PFCs.

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Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic effects on liquid metal film flowing along an inclined plate relating to plasma facing components

Yang

Ren

et al. 2020

Nucl. Fusion

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“…The high reactivity toward hydrogen and its isotopes reduces impurities in the plasma on one hand, and gives rise to tritium retention issues on the other. Furthermore, the magnetohydrodynamics (MHD) effect is another important phenomenon that must be taken into account when it comes to flowing Li in tokamaks since the Lorentz forces exerted by magnetic field can significantly change the flow and heat transfer of liquid Li [18].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study on the slippage of liquid lithium flow in tungsten nanochannels

Liu

2023

Nucl. Fusion

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As the use of liquid lithium (Li) as the plasma facing material in a fusion device becomes widespread, more and more research work has been dedicated to the numerical simulations of Li flow based on the Navier-Stokes equations. However, the slip condition of Li on a solid surface hasn’t been fully understood. The most common and simplest boundary condition, which is no-slip, is just one of the allowable conditions ranging from pure slip to multi-layer locking. In this work, molecular dynamics simulations of the Couette flow were performed to investigate the slip properties of liquid Li on tungsten (W) surfaces. The atomic structures near the surfaces were inspected. The influence of temperature, lattice orientation and biaxial strain of wall surfaces, as well as the surface roughness, were discussed. It was found that the slip length is always negative suggesting that the wall always retards the movement of liquid Li. Among all the factors, surface roughness has the most significant effects on the slippage. Two sectional linear relationships between the slip length and the height of the roughness elements were discovered. As the height of roughness elements reaches a critical point, micro vortexes begin to form and change the slope of the linear relationship.

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“…An experimental and numerical analysis was carried out by Hashizume [22] to determine the MHD flow in the liquid metal sheet process by identifying Li as a liquid metal that works. Currently, various researchers [23][24][25][26][27][28] have examined the MHD flow behavior of the lithium material in various duct structure applications.…”

Section: Introductionmentioning

confidence: 99%

Multiple Solutions for Stagnation-Point Flow of Unsteady Carreau Fluid along a Permeable Stretching/Shrinking Sheet with Non-Uniform Heat Generation

et al. 2021

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The aim of the present study was to explore the effect of a non-uniform heat source/sink on the unsteady stagnation point flow of Carreau fluid past a permeable stretching/shrinking sheet. The novelty of the flow model was enhanced with additional effects of magnetohydrodynamics, joule heating, and viscous dissipation. The nonlinear partial differential equations were converted into ordinary differential equations with the assistance of appropriate similarity relations and were then tackled by employing the Runge-Kutta-Fehlberg technique with the shooting method. The impacts of pertinent parameters on the dimensionless velocity and temperature profiles along with the friction factor and local Nusselt number were extensively discussed by means of graphical depictions and tables. The current results were compared to the previous findings under certain conditions to determine the precision and validity of the present study. The fluid flow velocity of Carreau fluid increased with the value of the magnetic parameter in the case of the first solution, and the opposite behavior was noticed for the second solution. It was seen that temperature of the Carreau fluid expanded with the higher values of unsteadiness and magnetic parameters. It was visualized from multiple branches that the local Nusselt number declined with the Eckert number parameter for both the upper and lower branch.

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Experimental study on the lithium film flow in the spanwise magnetic field

Cited by 8 publications

References 8 publications

Magnetohydrodynamic effects on liquid metal film flowing along an inclined plate relating to plasma facing components

Magnetohydrodynamic effects on liquid metal film flowing along an inclined plate relating to plasma facing components

Molecular dynamics study on the slippage of liquid lithium flow in tungsten nanochannels

Multiple Solutions for Stagnation-Point Flow of Unsteady Carreau Fluid along a Permeable Stretching/Shrinking Sheet with Non-Uniform Heat Generation

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