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

Liu, Songchang; Yu, Xianjun

doi:10.1088/1741-4326/acb27c

Cited by 2 publications

(2 citation statements)

References 40 publications

(52 reference statements)

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“…Under these conditions, energy confinement does not drop significantly (<10%) when ELM suppression is achieved compared with the ELMy H-mode conditions, while the core plasma tungsten concentration is clearly reduced as shown in Figure 14. This is very different from previous observations using low n (n=1 and 2) RMPs in EAST with high q95 (≥ 5), in which the plasma stored energy was significantly reduced (>20%) [55,56].…”

Section: 1elm Control By Rmpscontrasting

confidence: 99%

Advances in the long-pulse steady-state high beta H-mode scenario with active controls of divertor heat and particle fluxes in EAST

et al. 2022

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Since the last IAEA-Fusion Energy Conference, the Experimental Advanced Superconducting Tokamak (EAST) research program has been, in support of ITER and CFETR, focused on development in terms of the long-pulse steady-state (fully noninductive) high beta H-mode scenario with active controls of the stationary and transient divertor heat and particle fluxes. The operational domain of the steady-state H-mode plasma scenario has been significantly extended with ITER-like tungsten mono-block divertor, plasma control and heating schemes. EAST has achieved several important milestones in the development of high β p H-mode scenario and its key physics and technologies. A 60 s-scale long-pulse steady-state high β p H-mode discharge with the major normalized plasma parameters similar to the designed performance of the CFETR 1 GW fusion power operation scenario has been successfully established and sustained by pure RF heating and current drive. Several feedback control schemes have been developed for a sustained detachment with good core confinement. This includes control of the total radiation power, target electron temperature, and particle flux measured using divertor Langmuir probes or a combination of the control of target electron temperature and AXUV radiation near the X point. The detachment feedback control schemes have been integrated with small-ELM regimes and high β p scenario via neon seeding, enabling a core and edge compatible integrated high-beta scenario applicable to long-pulse operations. ELM suppression has been achieved using various methods, including resonant magnetic perturbations and impurity seeding. Full suppression of ELMs by using n = 4 RMPs has been demonstrated for ITER for the first time in low input torque plasmas in EAST. EAST has been operated with helium to support the ITER research requirements for the first time. For a long-pulse, high bootstrap current fraction operation, a new lower tungsten divertor with active water-cooling has been installed, along with improvements in the heating and current drive capability.

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Section: 1elm Control By Rmpscontrasting

confidence: 99%

Advances in the long-pulse steady-state high beta H-mode scenario with active controls of divertor heat and particle fluxes in EAST

et al. 2022

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“…71 Similarly, NEMD studies of Couette flow demonstrated a transition from Newtonian fluid behavior at low shear rates to non-Newtonian behavior at high shear rates. 72,73 In the current investigation, the shear viscosity of nanoconfined water was computed as follows: 71…”

Section: Resultsmentioning

confidence: 99%

Hydrodynamic slip characteristics of shear-driven water flow in nanoscale carbon slits

Shuvo,

Paniagua-Guerra,

Yang

et al. 2024

The Journal of Chemical Physics

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This paper reports on the effects of shear rate and interface modeling parameters on the hydrodynamic slip length (LS) for water–graphite interfaces calculated using non-equilibrium molecular dynamics. Five distinct non-bonded solid–liquid interaction parameters were considered to assess their impact on LS. The interfacial force field derivations included sophisticated electronic structure calculation-informed and empirically determined parameters. All interface models exhibited a similar and bimodal LS response when varying the applied shear rate. LS in the low shear rate regime (LSR) is in good agreement with previous calculations obtained through equilibrium molecular dynamics. As the shear rate increases, LS sharply increases and asymptotes to a constant value in the high shear regime (HSR). It is noteworthy that LS in both the LSR and HSR can be characterized by the density depletion length, whereas solid–liquid adhesion metrics failed to do so. For all interface models, LHSR calculations were, on average, ∼28% greater than LLSR, and this slip jump was confirmed using the SPC/E and TIP4P/2005 water models. To address the LS transition from the LSR to the HSR, the viscosity of water and the interfacial friction coefficient were investigated. It was observed that in the LSR, the viscosity and friction coefficient decreased at a similar rate, while in the LSR-to-HSR transition, the friction coefficient decreased at a faster rate than the shear viscosity until they reached a new equilibrium, hence explaining the LS-bimodal behavior. This study provides valuable insights into the interplay between interface modeling parameters, shear rate, and rheological properties in understanding hydrodynamic slip behavior.

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

Cited by 2 publications

References 40 publications

Advances in the long-pulse steady-state high beta H-mode scenario with active controls of divertor heat and particle fluxes in EAST

Advances in the long-pulse steady-state high beta H-mode scenario with active controls of divertor heat and particle fluxes in EAST

Hydrodynamic slip characteristics of shear-driven water flow in nanoscale carbon slits

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