Stability of the Vapour Phase in a Rotating Two-Phase Fluid System Subjected to Different Gravitational Intensities

Yee, D.; Wade, J. A.; Ward, C. A.

doi:10.1007/978-3-642-50091-6_39

Cited by 1 publication

(6 citation statements)

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“…The bubble moves off the axis of rotation and may change shape in response to forces arising from the gravitational field and the changing flow field. As the gravitational intensity is increased (for a fixed rotation rate) an instability has been observed to develop (Yee et al 1991). Ripples grow on the phase boundary and at high enough gravitational intensities, the vapour phase breaks into two or more separate bubbles.…”

Section: Gravitational Effects On Phase Stabilitymentioning

confidence: 99%

“…One such breakup is shown in figure 5. A preliminary experimental study of this breakup phenomenon using water as the experimental fluid has been previously reported (Yee et al 1991). Experiments (described in $3) show that for a fixed gravitational intensity, there is a lower limit to the rotation rate for which the vapour phase will remain as a single bubble.…”

Section: Gravitational Effects On Phase Stabilitymentioning

confidence: 99%

“…The experimental apparatus has been previously reported in Yee et al (1991). A schematic diagram is shown in figure 6.…”

Section: Experimental Apparatus For the Study Of Vapour-phase Shapesmentioning

confidence: 99%

“…Although the gravity level in the latter is small compared to that on Earth, it is not zero (Alexander 1990), and it is often necessary to determine its importance compared to that of rotational effects or of surface tension effects. Also, for such systems, instabilities have been observed to develop when the magnitude of the residual gravitational intensity bears a certain relation to the rotation rate (Yee, Wade & Ward 1991).…”

Section: Introductionmentioning

confidence: 99%

“…Under conditions where the gravitational effects are not negligible, an instability may develop that causes the vapour phase to become unstable and break into two or more separate bubbles (Yee et al 1991). This instability develops when an acceleration (or gravitational intensity) is imposed in a direction perpendicular to the axis of rotation.…”

Section: Introductionmentioning

confidence: 99%

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Bubble shapes in rotating two-phase fluid systems: a thermodynamic approach

1996

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A method is reported for predicting the shape of the phase boundary in two-phase isothermal constant-volume constant-mass rotating fluid systems. In contrast to previous methods that have employed the continuum concept of pressure, the proposed method uses the thermodynamic concept. The latter requires, in addition to the usual condition of a force balance existing at the boundary, that the equilibrium phase boundary shape be such that there is no net mass flux. The latter condition is imposed by requiring that the chemical potentials in the different phases be equal at the phase boundary. A non-dimensional parameter is defined that allows one to determine when the effects of a gravitational field acting at 90° to the axis of rotation may be neglected. Experiments have been performed under conditions where this restriction is satisfied. With known values of the experimentally controllable variables, the proposed method has been used to predict the length of the vapour phase. To within the experimental error, the predicted lengths are found to be in agreement with the measurements. If, however, a gravitational field of a sufficient magnitude is imposed the vapour phase has been found to become unstable and to break into two or more separate bubbles. Using the variable-gravity environment of an aircraft following a parabolic flight path, this instability has been investigated. By approximating the gravitational effects, the theoretical description has been extended and a method proposed to determine the conditions under which the phase boundary becomes unstable. If the angle of action of the net viscous shear force on the bubble were known, a prediction of the breakup could be made entirely in terms of experimentally controllable parameters. Using arguments for the value of this angle, bounds on the breakup condition are compared with experimental results.

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Section: Gravitational Effects On Phase Stabilitymentioning

confidence: 99%

Section: Gravitational Effects On Phase Stabilitymentioning

confidence: 99%

“…The experimental apparatus has been previously reported in Yee et al (1991). A schematic diagram is shown in figure 6.…”

Section: Experimental Apparatus For the Study Of Vapour-phase Shapesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%