English  |  正體中文  |  简体中文  |  Items with full text/Total items : 78111/78111 (100%)
Visitors : 30528008      Online Users : 229
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version

    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50252

    Title: Numerical simulation of heat and fluid flows for sapphire single crystal growth by the Kyropoulos method
    Authors: Chen,CH;Chen,JC;Lu,CW;Liu,CM
    Contributors: 機械工程學系
    Date: 2011
    Issue Date: 2012-03-27 17:07:42 (UTC+8)
    Publisher: 國立中央大學
    Abstract: Numerical computation has been performed to investigate temperature and velocity distributions for different stages of the Kyropoulos sapphire single crystal-growth process. The finite-element method is employed to solve the governing equations with proper boundary conditions. In the power history considered here, a vortex appears in the melt during growth, and its strength decreases as the input power is reduced. Isotherms in the melt are distorted by flow motion. The crystal-melt interface is always convex towards the melt and in early stages the convexity increases as the input power decreases. When the crystal-melt interface is close to the bottom of the crucible, this interface is flat near the apex because of reduction in growth rate near the upper region caused by input heat from the bottom of the crucible. Therefore, convexity of the crystal-melt interface decreases the input power decreases. The crystal shape predicted by the present simulation is similar to that of crystals grown in the industry. (C) 2010 Elsevier B.V. All rights reserved.
    Appears in Collections:[機械工程學系] 期刊論文

    Files in This Item:

    File Description SizeFormat

    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 隱私權政策聲明