sink flow

sink flow

[′siŋk ‚flō]
(fluid mechanics)
In three-dimensional flow, a point into which fluid flows uniformly from all directions.
In two-dimensional flow, a straight line into which fluid flows uniformly from all directions at right angles to the line.
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References in periodicals archive ?
The bathtub vortex (i.e., sink flow with swirl velocity) is a well-known phenomenon.
The appearance of swirl in the sink flow and the formation of the bathtub vortex can result from many factors.
Fundamentally, there have been several experimental and numerical studies to investigate the possibility of self-rotation phenomenon and the related instability in the sink flow. However, there is no consensus among the researchers about either the possibility or impossibility of this phenomenon.
In fact, one can see different and conflicting findings from the above mentioned studies, that is, some researchers accept the existence of self-rotation in the sink flow and some refuse.
In the present work, the possibility of circulation generation in the sink flow is studied numerically.
The Froude number of sink flow studies, defined as Fr = [square root of [Q.sup.2]/g[H.sup.5]], is always lower than 0.5 value.
First, the results corresponding to the stability of the sink flow and the effect of Re number on the azimuthal velocity [V.sub.[theta]] and circulation [GAMMA] are shown in Figs.
This result is consistent with the results obtained for the sink flow with a rotating body [22].
Knowing the inlet values of [V.sub.[theta].sup.*] as is the case in the present numerical study will be useful for understanding the nature of the swirl appearance in the sink flow. Fig.
The experimental studies [10-13] claimed that the swirl appears in the sink flow when either the drain flow rate or the Re number reaches some critical value.
Thus, the inverse-square law of gravitation is derived by methods of hydrodynamics based on a sink flow model of particles.
The main purpose of this paper is to derive the Newton's law of gravitation by means of fluid mechanics based on sink flow model of particles.