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  • 1
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    Physical phenomena in containerless glass processing (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Flight experiments are planned on drops containing bubbles. The experiments involve stimulating the drop via non-uniform heating and rotation. The resulting trajectories of the bubbles as well as the shapes of the drops and bubble will be videotaped and analyzed later frame-by-frame on the ground. Supporting ground based experiments are planned in the area of surface tension driven motion of bubbles, the behavior of compound drops settling in an immiscible liquid and the shapes and trajectories of large bubbles and drops in a rotating liquid. Theoretical efforts will be directed at thermocapillary migration of drops and bubbles, surfactant effects on such migration, and the behavior of compound drops.
    Keywords: MATERIALS PROCESSING
    Type: NASA, Washington, Microgravity Science and Applications Flight Programs, January - March 1987, Selected Papers, Volume 2; p 593-603
    Format: application/pdf
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  • 2
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    Measurement of interfacial tension of immiscible liquid pairs in microgravity (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A discussion is given of a containerless microgravity experiment aimed at measuring the interfacial tension of immiscible liquid pairs using a compound drop rotation method. The reasons for the failure to execute such experiments in microgravity are described. Also, the results of post-flight analyses used to confirm our arguments are presented.
    Keywords: MATERIALS PROCESSING
    Type: NASA. Marshall Space Flight Center, Joint Launch + One Year Science Review of USML-1 and USMP-1 with the Microgravity Measurement Group; p 361-374
    Format: application/pdf
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  • 3
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    The behavior of multiphase systems in low gravity (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The motion of drops and bubbles due to interfacial tension gradients is studied. It is noted that, when a drop or bubble is inserted into a fluid possessing a temperature gradient, the resulting gradient of interfacial tension will, through viscous traction on the neighboring fluid, cause it to move. In response, the drop will propel itself in the direction of the pole with the lower interfacial tension. This phenomenon, thermocapillary migration, is discussed in detail.
    Keywords: MATERIALS PROCESSING
    Type: AAS 86-553
    Format: text
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  • 4
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    Thermocapillary migration of a gas bubble in an arbitrary direction with respect to a plane surface (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The thermocapillary migration of a gas bubble in an unbounded fluid in the presence of a neighboring rigid plane surface is considered in the limit of negligible Reynolds and Marangoni numbers. Results are given for a scalar interaction parameter defined as the ratio of the speed of the bubble in the presence of the plane surface to the speed in its absence. It is suggested that the weaker interaction effects noted for the case of thermocapillary migration relative to the case of motion due to a body force such as that caused by a gravitational field is attributable to the more rapid decay, away from the bubble, of the disturbance velocity and temperature gradient fields. The surface is found to exert the greatest influence in the case of motion normal to it, and the weakest influence in the case of parallel motion.
    Keywords: MATERIALS PROCESSING
    Type: Journal of Colloid and Interface Science (ISSN 0021-9797); 115; 206-219
    Format: text
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  • 5
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    The dissolution or growth of a sphere (1984)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The problem of the dissolution or growth of an isolated stationary sphere in a large fluid body is analyzed. The motion of the boundary as well as the the resulting motion in the liquid are properly taken into account. The governing equations are solved using a recently developed technique (Subramanian and Weinberg, 1981) which employs an asymptotic expansion in time. Results for the radius of the sphere as a function of time are calculated. The range of utility of the present solution is established by comparison with a numerical solution of the governing equations obtained by the method of finite differences.
    Keywords: MATERIALS PROCESSING
    Type: Chemical Engineering Communications (ISSN 0098-6445); 27; 263-281
    Format: text
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  • 6
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    The thermocapillary motion of two bubbles oriented arbitrarily relative to a thermal gradient (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The interaction problem of two bubbles oriented at an arbitrary angle to a thermal gradient in the absence of gravity is studied. The problem is considered in the quasi-static limit, wherein unsteady and convective transport terms are completely neglected in the momentum and energy equations. Instead of bipolar coordinates, an approximation used in a previous analysis of the interaction effects of two bubbles moving along their line of centers in a thermal gradient is applied here to predict the interaction parameter.
    Keywords: MATERIALS PROCESSING
    Type: Journal of Colloid and Interface Science (ISSN 0021-9797); 97; 291-294
    Format: text
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  • 7
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    Of drops and bubbles - The technology of space processing (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: It is possible to manipulate a large, molten mass of material, such as a glass, aboard an orbital platform using acoustic fields. Attention is presently given to the problem of bubble removal from such a melt; it is desirable to make small bubbles coalesce into larger ones through floating melt rotation, to create an artificial convective field in which the bubbles will move centripetally to the axis of rotation. Computer models of bubble migration have been developed in order to define the operational conditions required aboard such experiment platforms as the Space Shuttle Orbiter.
    Keywords: MATERIALS PROCESSING
    Type: Perspectives in Computing (ISSN 0273-4621); 4; 4-19
    Format: text
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  • 8
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    The dissolution or growth of a gas bubble inside a drop in zero gravity (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The radius-time history of a gas bubble located concentrically within a spherical liquid drop in a space laboratory is analyzed within the framework of the quasi-stationary approximation. Illustrative results are calculated from the theory which demonstrate interesting qualitative features. For instance, when a pure gas bubble dissolves within a liquid drop in an environment containing the same gas and some inert species, the dissolution can be more or less rapid than that in an unbounded liquid depending on the initial relative size of the drop. Further, given a similar growth situation, indefinite growth is not possible, and the bubble will initially grow, but always dissolve in the end.
    Keywords: MATERIALS PROCESSING
    Type: Materials processing in the reduced gravity environment of space; Dec 01, 1986 - Dec 03, 1986; Boston, MA; United States
    Format: text
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