Effect of ambient fluid flow upon onset of oscillatory thermocapillary convection in half-zone liquid bridge

Irikura, Motoki; Arakawa, Y.; Ueno, Ichiro; Kawamura, Hiroshi

doi:10.1007/bf02945971

Cited by 29 publications

(32 citation statements)

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“…The number of publications considering the flow both, in the liquid bridge and in the surrounding gas, is still very limited, see [9,10]. As a rule, the flow is considered inside the liquid, and the boundary conditions on the free interface capture the impact of surrounding gas through the Biot number, e.g.…”

Section: Introductionmentioning

confidence: 99%

Liquid entrainment by gas flow along the interface of a liquid bridge

Gaponenko

Miadlun

Shevtsova

2011

Eur. Phys. J. Spec. Top.

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Abstract. We report the results of numerical and experimental studies of two-phase flows in an annulus. The geometry corresponds to a cylindrical liquid column co-axially placed into an outer cylinder with solid walls. Gas enters into the annular duct and entrains the initially quiescent liquid. The internal column consists of solid rods at the bottom and top, while the central part is a liquid bridge from a viscous liquid and kept in its position by surface tension. Silicone oil 5cSt was used as a test liquid and air and nitrogen as gases. An original numerical approach was developed to study the problem in complex geometry. The flow structure in the liquid is analyzed for a wide range of gas flow rates.

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Section: Introductionmentioning

confidence: 99%

Liquid entrainment by gas flow along the interface of a liquid bridge

Gaponenko

Miadlun

Shevtsova

2011

Eur. Phys. J. Spec. Top.

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“…The Biot number is a dimensionless parameter whose value depends not only on the properties of the media but also on the features of the flow. The flow structure and temperature distribution in the gas phase around the liquid bridge were studied experimentally [19,32] and numerically [33]. In the vicinity of the interface, the ambient air is entrained by the moving liquid, thus forming a vortex flow in the gas phase.…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…laboratory, the liquid bridge is often placed into a cylindrical co-axial chamber of a relatively large radius R out (the so-called shielded LB), the wall of which can be stabilized at different thermal conditions. The buoyancy driven flow may form an additional vortex flow in the air gap near the external wall of the shielding with circulation opposite to that of the primary vortex near the interface see [28,32]. Depending on the distance between the interface and the shielding, the primary vortex can be strongly compressed and may cause a significant heat flux through the interface.…”

Section: Tablementioning

confidence: 99%

The Stability of a Thermocapillary-Buoyant Flow in a Liquid Bridge with Heat Transfer Through the Interface

Watanabe

Melnikov

Matsugase

et al. 2014

Microgravity Sci. Technol.

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a b s t r a c tThe hydrodynamic stability of a thermocapillary flow in a finite-size liquid bridge, with a non-deformable interface, heated from above and surrounded by a passive gas is examined by means of three-dimensional direct numerical simulations. Convective flow in 1 cSt silicone oil with Pr ¼ 18 is driven by combined effects of buoyancy and thermocapillary forces. Effects of the interfacial heat exchange on hydrothermal stability of the bulk flow are evaluated for various external thermal conditions in the gas phase. Cooling the interface can significantly shift the bifurcation point where the thermocapillary flow becomes oscillatory. If the Biot number Bi, which is a measure of the rate of the heat exchange, is not large, the effect of the interfacial heat flux can be either stabilizing or destabilizing, depending on both the temperature profile in the gas and the height of the liquid bridge. For a high value of heat loss rate, stabilization occurs regardless of the temperature distribution in the ambient gas. Various flow regimes are identified, and detailed stability maps are made for the flow under the considered ambient thermal conditions. It was found that the critical azimuthal mode of the flow changes according to the surrounding conditions in the gas phase. Observations have revealed three distinct azimuthal modes: m ¼ 0 (critical for a long liquid bridge at small Biot numbers), m ¼ 1 and m ¼ 2. Any mode change of the flow is accompanied by an abrupt change of the frequency of temperature oscillations.

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“…Tiwari and Nishino [1] carried out the research regarding the effects of ambient air temperature on the surface heat transfer characteristics of a liquid bridge by using the "panel" boundary condition. Lrikura et al [2] studied the effects of ambient air on critical parameters of a liquid bridge using numerical and experimental methods. Although the effect of the ambient air was considered, the surface deformation of the liquid bridge was not considered in their studies.…”

Section: Introductionmentioning

confidence: 99%

Temperature and flow fields in a high prandtl number liquid bridge under microgravity

Yang

Liang

2015

MATEC Web of Conferences

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Abstract. The temperature and flow fields of high prandtl number liquid bridge with surface deformation have been investigated under microgravity by a developed numerical model, and numerical simulations have been carried out based on the Navier-Stokes equations coupled with the energy conservation equation on a staggered grid. In numerical calculations, the free surface deformation and the effects of ambient air are considered. The surface deformation of liquid bridge is monitored by level set method of mass conservation to capture two phase interfaces. Simultaneously, results of temperature and flow fields in liquid bridge are given. a S. Yang: 812886674@qq.com

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Effect of ambient fluid flow upon onset of oscillatory thermocapillary convection in half-zone liquid bridge

Cited by 29 publications

References 1 publication

Liquid entrainment by gas flow along the interface of a liquid bridge

Liquid entrainment by gas flow along the interface of a liquid bridge

The Stability of a Thermocapillary-Buoyant Flow in a Liquid Bridge with Heat Transfer Through the Interface

Temperature and flow fields in a high prandtl number liquid bridge under microgravity

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