Experimental Analysis and Flow Visualization of a Thin Liquid Film on a Stationary and Rotating Disk

Thomas, Scott K.; Faghri, Amir; Hankey, W. L.

doi:10.1115/1.2926500

Cited by 71 publications

(42 citation statements)

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“…The parameters reported to be responsible for these changes include increasing downstream depth (Craik et al, 1981), increasing volume flow (Errico, 1986;Thomas et al, 1991), and increasing upstream Froude number (Ishigai et al,' 1977). Typically, the changes reported are described as some form of instability in the smooth free surface of Fig.…”

Section: Introductionmentioning

confidence: 99%

The hydraulic jump in circular jet impingement and in other thin liquid films

Liu

Lienhard

1993

Experiments in Fluids

113

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The circular hydraulic jump exhibits behavior quite different from that commonly observed in planar jumps. Here we examine experimentally some of the causes and consequences of those differences. We suggest that surface tension plays a dominant role in establishing the shape of the circular jump for impinging jets. The importance of surface tension is a direct result of the thinness of the liquid films normally encountered in circular jump configurations. A sequence of instabilities appears in the jump's structure as the subcritical liquid film becomes thicker and surface tension effects decrease. These conclusions are corroborated by experiments on thin planar films which result in unusual jump structures, like those seen in circular jumps. In addition, we show that the standard momentum balance for the circular jump is effective only at relatively low supercritical Froude numbers or at low ratios of downstream to upstream depth. Typical values of those parameters for circular jumps are often quite large relative to the usual values for planar open-channel flows.

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Section: Introductionmentioning

confidence: 99%

The hydraulic jump in circular jet impingement and in other thin liquid films

Liu

Lienhard

1993

Experiments in Fluids

113

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“…From Eqs. (13)(14)(15)(16)(17), we can see that surface tension and molar volume of the entrapped fluid decreased with increased pressure. The reduction in surface (a) Net adhesion force (NAF) between spherical Cu particle and silicon surface entrapped with isopropanol medium as a function of the pressure and particle radius in CO2 + isopropanol at 313.15 K. (b) Equilibrium separation distance (ESD) between spherical Cu particle and silicon surface entrapped with isopropanol medium as a function of the pressure and particle radius in CO2 + isopropanol at 313.15 K. tension decreases the fluid bridge force F fb , while the decrease in surface tension and the molar volume of the entrapped fluid increases the capillary pressure effect force F cpe .…”

Section: Co 2 + Isopropanol Systemmentioning

confidence: 86%

“…Eqs. (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) were used to calculate the static forces of a particle on substrate under different pressures and temperatures. The solution of them employed Mathematica to obtain a series of data.…”

Section: Capillary Pressure Effect Forcementioning

confidence: 99%

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Microscopic model of nano-scale particles removal in high pressure CO2-based solvents

Chai

Zhang

Huang

et al. 2009

The Journal of Supercritical Fluids

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a b s t r a c tA physical model is presented to describe the kinds of static forces responsible for adhesion of nano-scale copper metal particles to silicon surface with a fluid layer. To demonstrate the extent of particle cleaning, equilibrium separation distance (ESD) and net adhesion force (NAF) of a regulated metal particle with different radii (10-300 nm) on the silicon surface in CO 2 -based cleaning systems under different pressures were simulated. Generally, increasing the pressure of the cleaning system decreased the net adhesion force between spherical copper particle and silicon surface entrapped with medium. For CO 2 + isopropanol cleaning system, the equilibrium separation distance exhibited a maximum at temperature 313.15 K in the regions of pressure space (1.84-8.02 MPa). When the dimension of copper particle was given, for example, 50 nm radius particles, the net adhesion force decreased and equilibrium separation distance increased with increased pressure in the CO 2 + H 2 O cleaning system at temperature 348.15 K under 2.50-12.67 MPa pressure range. However, the net adhesion force and equilibrium separation distance both decreased with an increase in surfactant concentration at given pressure (27.6 or 27.5 MPa) and temperature (318 or 298 K) for CO 2 + H 2 O with surfactant PFPE COO − NH 4 + or DiF 8 -PO 4 − Na + .

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“…2,3 If flow rate is relatively small, the film surface is smooth. 2,[4][5][6][7][8][9][10] With flow rate increasing and other physical parameters fixed, circumferential waves traveling from the disk center to its periphery appear. Nonaxisymmetric wave structures are observed at greater flow rates.…”

Section: Introductionmentioning

confidence: 99%

Stationary spiral waves in film flow over a spinning disk

2010

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Stationary spiral waves in liquid film flowing over a spinning disk have been observed in earlier experiments ͓H. Espig and R. Hoyle, "Waves in a thin liquid layer on a rotating disk," J. Fluid Mech. 22, 671 ͑1965͒; A. F. Charwat et al., "The flow and stability of thin liquid films on a rotating disk," ibid. 53, 227 ͑1972͒; G. Leneweit et al., "Surface instabilities of thin liquid film flow on a rotating disk," Exp. Fluids 26, 75 ͑1999͔͒.In the framework of a mathematical model derived by the integral method, it is shown that the waves develop due to nonaxisymmetric liquid feeding onto the spinning disk, and the wave shapes are approximated by the Archimedean spirals, whose coefficients depend on the Eckman number. The dependence has been confirmed by experimental data from recorded videos.

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Experimental Analysis and Flow Visualization of a Thin Liquid Film on a Stationary and Rotating Disk

Cited by 71 publications

References 0 publications

The hydraulic jump in circular jet impingement and in other thin liquid films

The hydraulic jump in circular jet impingement and in other thin liquid films

Microscopic model of nano-scale particles removal in high pressure CO2-based solvents

Stationary spiral waves in film flow over a spinning disk

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