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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
19890037689
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
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 University Tainan, Republic of China, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Materials Processing
Report/Patent Number
AIAA PAPER 89-0069
Accession Number
89A25060
Distribution Limits
Public
Copyright
Other

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