scholarly journals Technical Issues on the Control of Plasma-Wall Interactions in Steady-State Magnetic Fusion Devices. 3. Innovation Concepts for Plasma-Facing Components. A New Cooling Concept of Free Surface Flow Balanced with Surface Tension.

2002 ◽  
Vol 78 (2) ◽  
pp. 133-136 ◽  
Author(s):  
Tomoaki KUNUGI ◽  
Akio SAGARA
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Steady State ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Magnetic Fusion ◽  
Plasma Facing Components ◽  
Technical Issues ◽  
Wall Interactions

Two methods of surface tension treatment in free surface flow simulations

2018 ◽  
Vol 86 ◽  
pp. 236-242 ◽  
Author(s):  
Kirill D. Nikitin ◽  
Kirill M. Terekhov ◽  
Yuri V. Vassilevski
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Flow Simulations

Étude de formation de vortex au voisinage de l'aspiration verticale inversée dans un puits de pompage

1983 ◽  
Vol 10 (3) ◽  
pp. 369-383
Author(s):  
Tilena Kougnima ◽  
René Kahawita
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Laboratory Investigation ◽  
Relative Position ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Inertia Forces

The purpose of the laboratory investigation reported here has been to study the conditions under which vortices appear in the free surface flow upstream of a vertically inverted intake in a circular sump. The influence of geometry, approach conditions, size, and relative position of the intake in the sump has been studied. The effect of viscosity, surface tension, and inertia forces on the formation of vortices has been examined. A discussion of the results and the principal conclusions drawn permit certain recommendations to be made at the conceptual stage of pumping pits.

Nonlinear free-surface flow due to an impulsively started submerged point sink

1998 ◽  
Vol 364 ◽  
pp. 325-347 ◽  
Author(s):  
MING XUE ◽  
DICK K. P. YUE
Keyword(s):  
Free Surface ◽  
Steady State ◽  
Numerical Study ◽  
Free Surface Flow ◽  
Small Time ◽  
Surface Flow ◽  
Boundary Integral ◽  
Critical Regime ◽  
Gravitational Acceleration ◽  
Nonlinear Free Surface

The unsteady fully nonlinear free-surface flow due to an impulsively started submerged point sink is studied in the context of incompressible potential flow. For a fixed (initial) submergence h of the point sink in otherwise unbounded fluid, the problem is governed by a single non-dimensional physical parameter, the Froude number, [Fscr ]≡Q/4π(gh5)1/2, where Q is the (constant) volume flux rate and g the gravitational acceleration. We assume axisymmetry and perform a numerical study using a mixed-Eulerian–Lagrangian boundary-integral-equation scheme. We conduct systematic simulations varying the parameter [Fscr ] to obtain a complete quantification of the solution of the problem. Depending on [Fscr ], there are three distinct flow regimes: (i) [Fscr ]<[Fscr ]1≈0.1924 – a ‘sub-critical’ regime marked by a damped wave-like behaviour of the free surface which reaches an asymptotic steady state; (ii) [Fscr ]1<[Fscr ]<[Fscr ]2≈0.1930 – the ‘trans-critical’ regime characterized by a reversal of the downward motion of the free surface above the sink, eventually developing into a sharp upward jet; (iii) [Fscr ]>[Fscr ]2 – a ‘super-critical’ regime marked by the cusp-like collapse of the free surface towards the sink. Mechanisms behind such flow behaviour are discussed and hydrodynamic quantities such as pressure, power and force are obtained in each case. This investigation resolves the question of validity of a steady-state assumption for this problem and also shows that a small-time expansion may be inadequate for predicting the eventual behaviour of the flow.

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