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  • 1
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    Thermocapillary motion of bubbles and drops (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: An account is given of interface-driven motions of drops and bubbles. It is shown that even in the simplest cases, theory predicts exotic flow topologies. Attention is given to several unsolved problems that must be addressed both theoretically and experimentally.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: In: Microgravity fluid mechanics; Proceedings of the IUTAM Symposium, Bremen, Germany, Sept. 2-6, 1991 (A93-41676 17-34); p. 393-403.
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  • 2
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    The migration of a compound drop due to thermocapillarity (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The quasistatic thermocapillary motion of a compound drop in an unbounded fluid possessing a uniform temperature gradient is analyzed. For completeness, gravitational effects are included in the treatment. The general model is formulated, and the equations for the concentric case are solved using spherical polar coordinates, while the eccentric case is handled using bispherical coordinates. Results are given for the velocity of the drop as well as that of the droplet with respect to the drop, along with useful approximations. Illustrative results are presented graphically for the thermocapillary migration of a compound drop in the special case when the droplet is a gas bubble. In addition to the velocities of the drop and the bubble, representative isotherms and streamlines also are presented which display interesting qualitative features.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Physics of Fluids A (ISSN 0899-8213); 2; 2119-213
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  • 3
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    The migration of fluid droplets and their interactions in a thermal gradient (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: When materials are processed in free fall, buoyant forces will be substantially reduced. Thus, the buoyant migration of droplets and bubbles which normally occurs on earth is expected to be overshadowed by migration due to other mechanisms in space processing. In particular, capillary forces on droplets due to the variation of interfacial tension around their periphery will play a significant role in governing their motion in space. While such interfacial tension gradients can be caused by thermal, compositional, and/or electrical gradients in the continuous phase, thermal gradients are convenient to use in controlled experimentation. On earth, due to interference from buoyant effects, it is difficult to study thermocapillary migration in sufficient detail. Also, the effects of a thermal gradient on the interactions among droplets are hard to study on Earth. Thus, an orbital facility for conducting experiments on the migration and interactions of fluid droplets in a continuous phase due to the action of a thermal gradient appears attractive.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Alabama Univ. UAH(NASA Workshop on Fluids Expt. System; p 53-57
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  • 4
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    Interaction effects in thermocapillary bubble migration (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Two bubbles migrating along their line of centers under the influence of an imposed thermal gradient are considered in the quasi-static limit. Results are reported for representative values of the governing parameters.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: JPL Proc. of the 2d Intern. Colloq. on Drops and Bubbles; p 15-16
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  • 5
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    Thermocapillary migration and interactions of bubbles and drops (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Results from ground-based theoretical and experimental research on the motion of bubbles and drops in a temperature gradient are described and a brief account is given of plans for a flight experiment scheduled in 1994.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Second Microgravity Fluid Physics Conference; p 161-166
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  • 6
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    Thermocapillary migration of bubbles and droplets (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A discussion is presented concerning the motion of droplets in a surrounding fluid induced by a temperature gradient. Such 'thermocapillary migration' may be characterized as the tangential stress at the interface that is induced by the temperature gradient's variation of interfacial tension, causing motion in the neighboring fluid both inside and outside the droplet. As a result, the droplet moves in the direction of the pole with the lower interfacial tension. An analysis is conducted in the creeping flow limit, for the case of small Marangoni number values. The method of matched asymptotic expansions is used for the solution of the field equations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: (ISSN 0273-1177)
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  • 7
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    Bubble migration in a rotating, liquid-filled sphere (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Results and analysis of ground-based experiments performed to aid in designing experiments on the behavior of bubbles in a rotating liquid body on board the Shuttle in free fall are presented. Spherical shells filled with silicone oil containing a small gas bubble were spun and filmed by high speed motion picture photography. The rotation of the shell and the trajectory of the bubble motion were recorded and the film was exposed to a motion analyzer connected to a keypunch. The analyzer measured Cartesian coordinates as well as angle, frame number, and rotation rate. Optical correction equations were employed to determine the apparent bubble trajectory relative to an inertial frame of reference. An analytical model for the bubble motion was defined, yielding predictions of velocity and position at different times. Rotation of the fluid container is concluded to aid in centering the bubbles.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Physics of Fluids; 25; July 198
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  • 8
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    The motion of bubbles inside drops in containerless processing (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A theoretical model of thermocapillary bubble motion inside a drop, located in a space laboratory, due to an arbitrary axisymmetric temperature distribution on the drop surface was constructed. Typical results for the stream function and temperature fields as well as the migration velocity of the bubble were obtained in the quasistatic limit. The motion of bubbles in a rotating body of liquid was studied experimentally, and an approximate theoretical model was developed. Comparison of the experimental observations of the bubble trajectories and centering times with theoretical predictions lends qualified support to the theory.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: JPL Proc. of the 2d Intern. Colloq. on Drops and Bubbles; p 26-30
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  • 9
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    Physical phenomena in containerless glass processing (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Experiments were conducted on bubble migration in rotating liquid bodies contained in a sphere. Experiments were initiated on the migration of a drop in a slightly less dense continuous phase contained in a rotating sphere. A refined apparatus for the study of thermocapillar flow in a glass melt was built, and data were acquired on surface velocities in the melt. Similar data also were obtained from an ambient temperature fluid model. The data were analyzed and correlated with the aid of theory. Data were obtained on flow velocities in a pendant drop heated from above. The motion in this system was driven principally by thermocapillarity. An apparatus was designed for the study of volatilization from a glass melt.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-162007 , NAS 1.26:162007
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  • 10
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    Screening of liquids for thermocapillary bubble movement (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Ground-based methods for pretesting qualitatively the thermocapillary movement of gas bubbles in a liquid to be used in space processing are discussed. Theoretical considerations are shown to require the use of a thin, enclosed, horizontal liquid film in order that the bubbles move faster than the bulk convection of the liquid, with insulating boundaries to prevent the onset of instabilities. Experimental realizations of horizontal cells in which to test the thermocapillary movement of bubbles in sheets of molten glass heated from below and organic melts in tubes heated from both ends are briefly described and the results of experiments are indicated.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal; 17; Sept
    Format: text
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