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題 名 | 研究Q開關脈衝式雷射產生噴濺於自由水平面上和噴濺隨時間演進的結構變化=Explorations of a Q-Switched Laser Induced Water Jet on a Flat Free Water Surface and the Morphological Variations in the Temporal Evolution of the Water Jet |
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作 者 | 陳建至; 余彥廷; 蘇冠暐; | 書刊名 | 科儀新知 |
卷 期 | 35:2=196 2013.10[民102.10] |
頁 次 | 頁44-53 |
專 輯 | 先進雷射技術與應用專題 |
分類號 | 448.59 |
關鍵詞 | 聚焦點離水面; 噴濺時間; 噴濺; 自由水平面; Q開關脈衝式雷射; |
語 文 | 中文(Chinese) |
中文摘要 | 本文利用Q開關脈衝式雷射聚焦於自由水平面下,並且改變聚焦點離水面的深度,觀察水面上的噴濺之形成與時間演進的結構變化。水面上的噴濺水柱有粗細兩段,然後粗水柱的頂部有一個皇冠結構的噴濺。此皇冠噴濺由特殊環狀水面塌陷的回復所產生。在時間的演進中,我們發現皇冠噴濺會漸漸收縮閉合產生氣泡於粗水柱之中,並在適當的聚焦深度下,此氣泡中還會包覆一顆小水滴。 |
英文摘要 | The dynamics of a water jet on a flat free surface are investigated using a nanosecond pulsed laser for creating an oscillating bubble with different depths beneath the free surface. The water jet shows a thin jet followed by a markedly thicker jet and a circular crown-like jet perfectly connected on the shoulder of the thick jet transited to the thin jet. The crown-like jet is generated from the collapse of a circular ring-shaped crater. In the temporal evolution of the water jet, we find an intriguing pattern formation that the crown-like jet gradually closes and finally forms an air bubble. For certain depth, the air bubble perfectly encloses a water drop through the process of Plateau-Rayleigh instability. |
本系統中英文摘要資訊取自各篇刊載內容。