Design considerations for the rotating electrostatic liquid-film radiator

Bankoff, S. G.; Miksis, Michael J.; Kim, H.; Gwinner, R.

doi:10.1016/0029-5493(94)90309-3

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…The flowing film is subject to the Taylor cone instability, whereby a cone of fluid forms underneath an electrode and sharpens until a jet of fluid is pulled toward the electrode and disintegrates into droplets. The critical potential for the instability is shown to be as much as an order of magnitude higher than that used in previous designs 2. Furthermore, leak stoppage experiments indicate that the critical field is adequate to stop leaks in a working radiator.…”

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confidence: 74%

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Use of an Electric Field in an Electrostatic Liquid Film Radiator

Bankoff

Griffing

Schluter

2002

Annals of the New York Academy of Sciences

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Experimental and numerical work was performed to further the understanding of an electrostatic liquid film radiator (ELFR) that was originally proposed by Kim et al.(1) The ELFR design utilizes an electric field that exerts a normal force on the interface of a flowing film. The field lowers the pressure under the film in a space radiator and, thereby, prevents leakage through a puncture in the radiator wall. The flowing film is subject to the Taylor cone instability, whereby a cone of fluid forms underneath an electrode and sharpens until a jet of fluid is pulled toward the electrode and disintegrates into droplets. The critical potential for the instability is shown to be as much as an order of magnitude higher than that used in previous designs.(2) Furthermore, leak stoppage experiments indicate that the critical field is adequate to stop leaks in a working radiator.

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confidence: 74%

“…Kim et al 14,15 and Bankoff et al 2 also investigated other geometries that are more applicable to an ELFR. A spinning conical design, in which the coolant flowed from the apex of a cone to the wide end, had a fluid height solution that typically thinned as the fluid moved along the radiator wall.…”

Section: Previous Workmentioning

confidence: 99%

Use of an Electric Field in an Electrostatic Liquid Film Radiator

Bankoff

Griffing

Schluter

2002

Annals of the New York Academy of Sciences

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“…The manipulation of a liquid film by means of an electric field has been discussed by numerous authors with particular applications in mind, for example, by Bankoff et al (1994), , Bankoff et al (2002), and Griffing et al (2006). The electric field affects the flow through an additional Maxwell stress term in the stress balance at the film surface.…”

Section: Introductionmentioning

confidence: 99%

Electrified viscous thin film flow over topography

et al. 2008

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The gravity-driven flow of a liquid film down an inclined wall with periodic indentations in the presence of a normal electric field is investigated. The film is assumed to be a perfect conductor, and the bounding region of air above the film is taken to be a perfect dielectric. In particular, the interaction between the electric field and the topography is examined by predicting the shape of the film surface under steady conditions. A nonlinear, non-local evolution equation for the thickness of the liquid film is derived using a long-wave asymptotic analysis. Steady solutions are computed for flow into a rectangular trench and over a rectangular mound, whose shapes are approximated with smooth functions. The limiting behaviour of the film profile as the steepness of the wall geometry is increased is discussed. Using substantial numerical evidence, it is established that as the topography steepness increases towards rectangular steps, trenches, or mounds, the interfacial slope remains bounded, and the film does not touch the wall. In the absence of an electric field, the film develops a capillary ridge above a downward step and a slight depression in front of an upward step. It is demonstrated how an electric field may be used to completely eliminate the capillary ridge at a downward step. In contrast, imposing an electric field leads to the creation of a free-surface ridge at an upward step. The effect of the electric field on film flow into relatively narrow trenches, over relatively narrow mounds, and down slightly inclined substrates is also considered.

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“…The boundary conditions are no-slip along the wall, while along the free surface at r = fi(t, z) we have the kinematic condition, zero tangential stress condition, as well as the normal stress condition (see e.g., Landau et al 6 ) 21/2 (3) Introduce a rectangular coordinate system (x, y) as shown in Fig. 1.…”

Section: Formulationmentioning

confidence: 99%

Electrostatic field effects on a rotating liquid film conical radiator

Kim

Bankoff

Miksis

1993

Journal of Propulsion and Power

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We present a study of the interaction of an electrostatic field with a thin liquid film with a free surface flowing down the inner wall of a rotating conical radiator due to centrifugal force. First, we examine the effect of the electric field on the stability of the film flow. Next, several limits of the equations of motion are investigated analytically, and then compared with an explicit numerical calculation of the equations of motion. Also, we discuss applications of these calculations to a proposed electrostatic liquid film space radiator.

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Design considerations for the rotating electrostatic liquid-film radiator

Cited by 9 publications

References 6 publications

Use of an Electric Field in an Electrostatic Liquid Film Radiator

Use of an Electric Field in an Electrostatic Liquid Film Radiator

Electrified viscous thin film flow over topography

Electrostatic field effects on a rotating liquid film conical radiator

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