摻鎂鈮酸鋰浮點式熔區熱流現象之探討

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諶貴花(Qui-Hua Zhan ) 查詢紙本館藏

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論文名稱

摻鎂鈮酸鋰浮點式熔區熱流現象之探討

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摘要(中)

本實驗以LHPG 系統探討摻鎂鈮酸鋰浮點式熔區之流場型
態、熔區界面及溫度等各項參值隨不同之添加量及外加功率之變化。
在熔解之過程中，我們發現純鈮酸鋰從熔解初期至熔區崩潰前，
熔區均呈現穩態之熱張力對流，而摻鎂鈮酸鋰在氧化鎂添加量大於
1mol%以後，熔區開始產生非穩態之振盪性熱張力對流。
熔區表面溫度之振盪頻率隨功率、馬諾哥尼數Ma1、熔區長度及
普蘭度數之增加而下降。在同一普蘭度數下，長徑比越大臨界馬諾哥
尼數Ma2c越低熔區越易引發非穩態之振盪。熔區之幾何外型與熔區振
盪之引發有關。
普蘭度數、密度差與靜龐德數隨著氧化鎂添加量而改變熔區物理
性質，使熔區外型隨功率之變化有很大的不同，進而影響熔區之溫
度、流場及界面，而LHPG 之加熱特性，也使得熔區之加熱量隨外型
而變。

論文目次

摘要 ----------------------------------------------------------------------I
誌謝 ---------------------------------------------------------------------II
目錄 --------------------------------------------------------------------- III
表目錄 ------------------------------------------------------------------ V
圖目錄 ------------------------------------------------------------------ VI
符號說明 --------------------------------------------------------------- X
第一章緒論 ------------------------------------------------------------ 1
1-1 前言 ----------------------------------------------------------------------- 1
1-2 LHPG 熔區流場型態 ----------------------------------------------2
1-2-1 熔區之熱張力對流 ----------------------------------------------- 2
1-2-2 熔區之表面溫度 ----------------------------------------------- 5
1-2-3 熔區外型 ----------------------------------------------------------- 5
1-2-4 固液界面 ----------------------------------------------------------- 6
1-3 添加氧化鎂對鈮酸鋰之影響 ----------------------------------------- 7
1-3-1 Prandtl Number ----------------------------------------------- 8
1-3-2 Bond Number ----------------------------------------------- 8
1-4 研究動機及目的 ----------------------------------------------------------- 9
第二章實驗設備及材料--------------------------------------------- 10
2-1 實驗設備 ------------------------------------------------------------------ 10
2-2 光學理論 ------------------------------------------------------------------ 1 2
2-3 實驗材料 ------------------------------------------------------------------ 1 3
IV
2-4 實驗方法 ------------------------------------------------------------------ 14
第三章結果與討論 ----------------------------------------------------15
3-1 熔區流場型態 ------------------------------------------------------------ 1 5
3-1-1 穩態之熱張力對流---純鈮酸鋰之熔解 --------------------- 15
3-1-2 非穩態之熱張力對流---摻鎂鈮酸鋰之熔解 --------------- 19
3-2 摻鎂鈮酸鋰之熔解 --------------------------------------------------- -- 23
3-2-1 1mol%摻鎂鈮酸鋰 --------------------------------------------- 23
3-2-2 3mol%摻鎂鈮酸鋰 --------------------------------------------- 26
3-2-3 5mol%摻鎂鈮酸鋰 --------------------------------------------- 27
3-2-4 7mol%摻鎂鈮酸鋰 --------------------------------------------- 28
3-3 純鈮酸鋰與摻鎂鈮酸鋰之比較 -------------------------------------- - 29
第四章結論 ------------------------------------------------------------- 31
參考文獻 ------------------------------------------------------------------- 33

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指導教授

陳志臣(Jyh-Chen Chen)

審核日期

2001-7-18

推文