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A Numerical Study of Heat Transfer and Fluid Flow in a Hydrothermal Autoclave With a Single- or Multi-Hole Baffle

[+] Author Affiliations
Hongmin Li, Edward A. Evans, G.-X. Wang

University of Akron, Akron, OH

Paper No. HT2003-47371, pp. 219-226; 8 pages
  • ASME 2003 Heat Transfer Summer Conference
  • Heat Transfer: Volume 3
  • Las Vegas, Nevada, USA, July 21–23, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3695-9 | eISBN: 0-7918-3679-7
  • Copyright © 2003 by ASME


Hydrothermal solution growth is an important technique to grow high quality piezoelectric single crystals. In industry hydrothermal crystal growth, an autoclave is divided into two chambers by a baffle located in the middle height. Industrial practice found that better quality crystals could be grown under certain baffle hole openings or using a multi-hole baffle. This paper presents a numerical study of the effects of the baffle opening, as well as the arrangement of holes on the baffle, on the fluid flow and temperature fields in an industry-size autoclave. A wide range of baffle hole openings from 2% to 25%, together with five hole-arrangements, is investigated. Computational results indicate that changing the baffle hole opening and number of holes on the baffle are effective ways to control the temperature uniformity in the upper growing chamber. With a single-hole baffle, a smaller hole-opening leads to a weaker flow field and more uniform temperature in the growing chamber. With the same opening area, a multi-hole baffle will perform better than a single-hole baffle. The number of holes in a multi-hole baffle shows a strong effect on thermal condition in the upper chamber with 8-hole baffles working better than both baffles with 4 and 16 holes. The hole-arrangement, however, does have significant effect on thermal condition in the growing chamber.

Copyright © 2003 by ASME



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