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Effect of Processing Pressure on Isolated Pore Formation during Controlled Directional Solidification in Small ChannelsDirectional solidification experiments were performed, using succinonitrile saturated with nitrogen gas, to examine the effects of in-situ processing pressure changes on the formation growth, and evolution of an isolated, cylindrical gaseous pore. A novel solidification facility, capable of processing thin cylindrical samples (I.D. < 1.0 mm), under controlled pressure conditions, was used for the experiments. A new experimental method for growing the isolated pore from a seed bubble is introduced. The experimental results indicate that an in-situ processing pressure change will result in either a transient change in pore diameter or a complete termination of pore growth, indicating that pressure changes can be used as a control parameter to terminate bubble growth. A simple analytical model has been introduced to explain the experimental observations.
Document ID
20090007648
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Cox, Matthew C.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Anilkumar, Amrutur V.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Grugel, RIchard N.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Lee, Chun P.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Subject Category
Chemistry And Materials (General)
Report/Patent Number
MSFC-2018
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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