本研究延續本實驗室前研究者張宇祐之淬冷研究，藉由小規模的實驗架設模擬高溫熔融物質的淬冷，並參考既有文獻以三氧化二鉍及三氧化鎢的混和粉末作為模擬物質。此混和粉末在攝氏870度下會產生共晶現象，因此本研究將40克混和粉末置入一帶有塞桿的304不鏽鋼管中，並加熱至攝氏900度，再藉由能調整淬冷槽平台高低的實驗設計來改變不銹鋼管噴嘴至下方冷卻水槽的熔體掉落距離(300mm~600mm)，而後利用高速攝影機記錄熔體掉落至冷卻水槽時的淬冷與多相流現象。待熔體淬冷完畢後，蒐集其碎片並用篩網濾出不同尺寸的碎片以分析整體碎片尺寸分布。結果顯示隨著掉落距離的增加，熔體的落水初速度也更快，小尺寸碎片數量也因凱文—赫爾霍茲不穩定性的作用而佔較多比率，這將使碎片溫度冷卻更快。若落水初速度較慢，瑞利—泰勒不穩定性的影響將提高，使熔體流柱破碎於尖端並較少細小碎片的產生。本實驗在水面下設置一不鏽鋼傾斜板進行淬冷，其結果與自然淬冷比較後發現片狀構造的固化碎片，其質地脆弱且易碎化，進而導致小尺寸碎片遽增，判斷表面積的增加會加速其降溫。

This study extends the previous studies in our laboratory to simulate the quenching of molten materials using a small-scale experiment setup. The mixture of bismuth trioxide and tungsten trioxide powder, which exhibits eutectic behavior at 870℃, is adopted as the simulate material, as suggested in the literature. During the experiment, 40g of the powder is heated to 900℃ inside an annulus of a 304 stainless steel with a plug axle. The design of the experiment is able to adjust the coolant platform’s height to change the dropping distance of the molten material, ranging from 300mm to 600mm. Then by using high-speed camera to observe quenching and multiphase flow phenomena. Additionally, we gather the debris after quenching and filter the pieces by a series of strainers to determine the size distribution. The size distribution shows more small size debris when the dropping length is higher. This is due to the molten jet entering the coolant with a higher entry velocity and causing a more intensive Kelvin-Helmholtz instability to occur. If the entry velocity is slower, Kelvin-Helmholtz instability weakens and the influence of Rayleigh-Taylor instability will increase, causing the molten jet to breakup from the front end. This experiment sets a steel plate below the coolant surface at certain angle to investigation the quenching effect while the molten material contacts the incline board. The results show that the molten material may slide along the incline plate while quenching, and the debris may form a flake structure. The fragile and brittle flake structure may shatter to more small size debris, which may have higher heat removal due to the increase of surface area.

摘要 i
Abstract ii
誌謝 iii
目錄 v
表目錄 viii
圖目錄 ix
符號說明 xii
第一章 緒論 1
1-1 淬冷介紹 1
1-2 研究動機與背景 2
1-3 研究目的 5
1-4 論文架構 6
第二章 文獻回顧 7
2-1 模擬熔融物質的淬冷 7
2-2 熔體流柱破碎行為的探討 8
第三章 實驗方法 11
3-1 實驗系統架設組件 12
3-1.1 高溫熔爐系統、汽缸及升降夾 12
3-1.2 不鏽鋼加熱管組件 14
3-1.3 淬冷槽平台 15
3-1.4 高速攝影機 17
3-1.5 資料收集系統 17
3-1.6 定量篩網平台 18
3-1.7 粉末攪拌機 18
3-2 模擬熔融物質 20
3-3 實驗方法 22
3-3.1 淬冷實驗的事前準備 22
3-3.2 影像捕捉與分析 22
3-3.3 淬冷後碎片分析 22
3-4 實驗步驟 23
3-5 實驗條件 24
第四章 實驗結果與討論 25
4-1 共晶熔融體Bi2O3-WO3淬冷 25
4-1.1 不同掉落高度之淬冷比較 26
4-1.2 不同冷卻水深度之淬冷比較 30
4-1.3 不同冷卻水之淬冷比較 32
4-1.4 沿不同角度之傾斜板滑落之淬冷比較 36
4-2 熔融流柱的破碎行為 40
4-3 研究結果比較與討論 43
4-3.1 熔體碎片尺寸分布之趨勢分析 43
4-3.2 流柱破碎長度與不穩定性臨界波長討論 44
4-3.3 熔體碎片尺寸之最大值討論 46
第五章 結論與建議 48
5-1 結論 48
5-2 未來建議 50
參考文獻 51

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