Experimental and Numerical Investigations of Two-Phase Flow with Non-Isothermal Boundary Conditions under Microgravity Conditions (PDF)
(Sprache: Englisch)
Two-phase flow with a free surface, non-isothermal boundary conditions and heat and mass transfer over the free surface must be understood for a save operation of cryogenic upper stages with restart capability. This work is a foundational research carried...
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Two-phase flow with a free surface, non-isothermal boundary conditions and heat and mass transfer over the free surface must be understood for a save operation of cryogenic upper stages with restart capability. This work is a foundational research carried out with numerical and experimental means.
A mathematical and numerical model were developed that allow to describe such systems under varying gravity levels. The reorientation of cryogenic parahydrogen upon a sudden gravity step reduction was investigated experimentally using the drop tower at ZARM, University of Bremen. Influencing the motion and final shape of the free surface could be realized with a precisely defined wall temperature gradient.
Heat and mass transfer over the free surface in a microgravity environment could be investigated numerically based on the experimental results of the SOURCE-II sounding rocket experiment. A transient simulation was carried out to study the coupled system between superheated container wall, subcooled liquid, free surface configuration and three-phase contact angle.
A mathematical and numerical model were developed that allow to describe such systems under varying gravity levels. The reorientation of cryogenic parahydrogen upon a sudden gravity step reduction was investigated experimentally using the drop tower at ZARM, University of Bremen. Influencing the motion and final shape of the free surface could be realized with a precisely defined wall temperature gradient.
Heat and mass transfer over the free surface in a microgravity environment could be investigated numerically based on the experimental results of the SOURCE-II sounding rocket experiment. A transient simulation was carried out to study the coupled system between superheated container wall, subcooled liquid, free surface configuration and three-phase contact angle.
Bibliographische Angaben
- 2017, 204 Seiten, Englisch
- Verlag: Cuvillier Verlag
- ISBN-10: 3736984936
- ISBN-13: 9783736984936
- Erscheinungsdatum: 06.03.2017
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- Grösse: 6.65 MB
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Englisch
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