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Leitlinien Unfallchirurgie
5. Auflage bestellen |
Table of Contents, PDF (53 KB)
Extract, PDF (180 KB)
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.
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 |