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Convective flows in enclosures with vertical temperature or concentration gradientsThe transport process in the fluid phase during the growth of a crystal has a profound influence on the structure and quality of the solid phase. In vertical growth techniques the fluid phase is often subjected to vertical temperature and concentration gradients. The main objective is to obtain more experimental data on convective flows in enclosures with vertical temperature or concentration gradients. Among actual crystal systems the parameters vary widely. The parametric ranges studied for mass transfer are mainly dictated by the electrochemical system employed to impose concentration gradients. Temperature or concentration difference are maintained between two horizontal end walls. The other walls are kept insulated. Experimental measurements and observations were made of the heat transfer or mass transfer, flow patterns, and the mean and fluctuating temperature distribution. The method used to visualize the flow pattern in the thermal cases is an electrochemical pH-indicator method. Laser shadowgraphs are employed to visualize flow patterns in the solutal cases.
Document ID
19890003382
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Wang, L. W.
(NASA Lewis Research Center Cleveland, OH., United States)
Chai, A. T.
(NASA Lewis Research Center Cleveland, OH., United States)
Sun, D. J.
(National Cheng Kung Univ. Tainan, Taiwan)
Date Acquired
September 5, 2013
Publication Date
January 1, 1988
Subject Category
Materials Processing
Report/Patent Number
NASA-TM-101373
E-4421
AIAA PAPER 89-0069
NAS 1.15:101373
Meeting Information
Meeting: Aerospace Sciences Meeting
Location: Reno, NV
Country: United States
Start Date: January 9, 1989
End Date: January 12, 1989
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
89N12753
Funding Number(s)
PROJECT: RTOP 674-25-05
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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