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Experimental and Numerical Investigations of Two-Phase Flow with Non-Isothermal Boundary Conditions under Microgravity Conditions

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Experimental and Numerical Investigations of Two-Phase Flow with Non-Isothermal Boundary Conditions under Microgravity Conditions (English shop)

Sebastian Schmitt (Author)

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ISBN-13 (Hard Copy) 9783736994935
ISBN-13 (eBook) 9783736984936
Language English
Page Number 204
Edition 1. Aufl.
Publication Place Göttingen
Place of Dissertation Bremen
Publication Date 2017-03-06
General Categorization Dissertation
Departments Manufacturing and production engineering
Keywords Microgravity, two-phase flow, heat transfer, mass transfer, CFD, CHT, experimental work, cryogenic fluids, free surface reorientation
Description

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.