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Effect of Vibration on Transport Experiments - Model Experiments during Parabolic Flights

Mathiak, Gerhard and Sies, Wolfram and Weiß, Sebastian and Willnecker, Rainer and Odabasi, Ziya and Plescher, Engelbert (2005) Effect of Vibration on Transport Experiments - Model Experiments during Parabolic Flights. ELGRA Biennial Meeting and General Assembly, 2005-09-21 - 2005-09-23, Santorini (Greece). (Unpublished)

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Abstract

Diffusion and convection are the main physical processes in crystal growth and metallurgy. On ground, the measured diffusion coefficients of liquids are often enlarged due to the additional mass transport of the natural convection especially at high temperatures. In microgravity, g-jitter and residual acceleration can easily disturb the measurement. The influence of vibrations on liquid transport experiments was investigated quantitatively in a model heat transport experiment using hot and warm water during three ESA parabolic campaigns. A reflight with a further developed experimental set-up was performed during ESA PFC 39 in March 2005. The goal was to minimize the transport induced by the starting of the experiment. Two different methods to start the experiments were used: the shear cell method and the flowing junction cell method. The cells with a 4mm and 10mm thin capillary were fixed on an oscillating platform in three different positions: with an angle of 0°, 45° and 90° between the capillary axis and the acceleration vector.

Document Type:Conference or Workshop Item (Speech)
Title:Effect of Vibration on Transport Experiments - Model Experiments during Parabolic Flights
Authors:
AuthorsInstitution or Email of Authors
Mathiak, GerhardUNSPECIFIED
Sies, WolframUNSPECIFIED
Weiß, SebastianUNSPECIFIED
Willnecker, RainerUNSPECIFIED
Odabasi, ZiyaFH Aachen
Plescher, EngelbertFH Aachen
Date:2005
Status:Unpublished
Keywords:Diffusion, Thermal Conductivity, Microgravity, Parabolic Flight
Event Title:ELGRA Biennial Meeting and General Assembly
Event Location:Santorini (Greece)
Event Type:international Conference
Event Dates:2005-09-21 - 2005-09-23
Organizer:ELGRA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Institute of Space Simulation > Center for Solidification of Undercooled Melts (ZEUS)
Deposited By: Dr.-Ing. Gerhard Mathiak
Deposited On:03 Jan 2006
Last Modified:27 Apr 2009 04:50

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