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Experimental Investigation of Cryogenic Chilldown in a Tube Segment

Pollex, Jan Caspar (2022) Experimental Investigation of Cryogenic Chilldown in a Tube Segment. Master's, Universität Bremen.

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This thesis performed precursor cryogenic chilldown experiments with liquid nitrogen for the DLR lead FROST mission (Future-Oriented Research Platform For Orbital Cryogenic Storage Technologies). A test bench was designed and built utilizing upwards vertical flow through a transparent 6 mm tube segment. The outer wall temperature of the tube, the fluid pressure and temperature and flow rate were captured, as well as high speed video of the developing flow regime. From the data captured, the boiling curve for the chilldown process was constructed and discussed. The Biot number is calculated in order to judge the mathematical approach used. Furthermore, the Suratman number is constructed using a void fraction extracted from the video of the flow. Using the Suratman number, flow pattern maps are applied in order to classify the flow regime from the physical parameters and is subsequently validated by a manual visual investigation. The results are discussed in the frame of the literature and compared to previously published experiments. Lessons learned are drawn from the performed experiments and subsequently solutions and remedies for the occurring challenges are proposed. This enables future repetition of the experiments resulting in higher fidelity data. In addition, other aspects of the chilldown process to be analyzed are proposed.

Item URL in elib:https://elib.dlr.de/196982/
Document Type:Thesis (Master's)
Title:Experimental Investigation of Cryogenic Chilldown in a Tube Segment
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:12 July 2022
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Cryogenic, Chilldown, Quenching, liquid Nitrogen, upwards vertical flow, Boiling Curve, Suratman Number, Flow regime prediction, void fraction measurement
Institution:Universität Bremen
Department:Fachbereich 4 Produktionstechnik, Maschinenbau und Verfahrenstechnik
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Lead Project - Upper Level Research Network
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Transport and Propulsion System
Deposited By: Gerstmann, Dr.-Ing. Jens
Deposited On:04 Sep 2023 12:03
Last Modified:12 Sep 2023 14:02

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