5-2 未來展望
本文數值模擬中，重視的是不同曲率的流道如何影響噴液的行 為，也加入了不同振幅、頻率與親疏水性的邊界條件來觀察是否對噴 液行為有所影響，並沒有考慮到噴孔片的材料性質與流體性質不同是 否會有影響。例如改變噴孔片的材質、流體的黏滯係數等。此外本文 的模型是採用 2D 軸對稱，因此設計的噴孔呈現圓形，或許未來可以 透過 3D 的模型來討論不同噴孔形狀以及孔與孔之間排列的疏密度會 否對液滴噴射系統有所影響，這些種種的問題都是未來值得去探討 的。
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表附錄
表 3-1 模擬模型的物理參數
工作流體 water air Density
(kg/m^3)
1000 1.1614
Kinematic Viscosity (m^2/s)
1.00E-06 1.59E-05
Surface Tension (N/m)
0.0725
Temperature (K)
300
表 4-1 驗證案例的幾何尺寸
表 4-2 驗證案例的物理參數
1.00E-03 1.84E-05
Surface Tension (N/m)
orifice diameter(μm) Volume(pl) Velocity(m/s) 14 2.57154 7.799813 24 13.94013 5.48239 34 22.10772 4.173263
表 4-4 主液滴飛行速度時間(m/s)結果表
案例 振幅
a b c d e f
0.25(μm) 66.976 30.0023 20.4554 13.2331
1(μm) 520.048 158.774 126.404 99.392 32.330 20.644
表 4-5 主液滴體積(picoliter)結果表
案例 振幅
a b c d e f
0.25(μm) 0.009799 0.0402 0.04422 0.04759
1(μm) 0.007746 0.03165 0.03173 0.0335 0.05089 0.0556
表 4-6 主液滴斷裂時間(μs)結果表
表 4-7 主液滴飛行速度時間(m/s)與接觸角關係表
案例 接觸角
a b c d
7.1∘ 104.643 30.002 20.455 13.233 70∘ 105.070 30.466 22.897 16.140 120∘ 105.081 31.981 24.321 18.487 170∘ 105.213 34.404 28.643 21.187
表 4-8 主液滴體積(picoliter) 與接觸角關係表
案例 接觸角
a b c d
7.1∘ 0.0098 0.0402 0.0442 0.0476 70∘ 0.0094 0.0348 0.0403 0.0415 120∘ 0.0092 0.0332 0.0391 0.0412 170∘ 0.0086 0.0325 0.0384 0.0392
表 4-9 主液滴斷裂時間(μs) 與接觸角關係表
案例 接觸角
a b c d
7.1∘ 0.2995 1.17 1.43 1.515 70∘ 0.314 1.285 1.453 1.515 120∘ 0.314 1.38 1.4 1.525 170∘ 0.314 1.1135 1.2 1.43
表 4-10 主液滴飛行速度時間(m/s)結果表
案例 振幅
a b c d e f
f_100k 66.976 30.002 20.455 13.233
f_200k 249.225 77.155 58.298 48.624 3.202
表 4-11 主液滴體積(picoliter)結果表
案例 振幅
a b c d e f
f_100k 0.0098 0.0402 0.0442 0.0476
f_200k 0.007 0.0337 0.0348 0.0385 0.0298
表 4-12 主液滴斷裂時間(μs)結果表
表 4-13 衛星液滴個數與接觸角關係表
圖目錄
圖 1-1 熱汽泡式微噴液裝置[33]
圖 1-2 壓電式微噴液裝置[33]
圖 2-1 振動噴孔片模型
圖 2-2 物理模型圖
圖 3-1 CFD-GEOM 操作畫面
圖 3-2 CFD-ACE 操作畫面
圖 3-3 CFD-VIEW 操作畫面
圖 3-4 CFD-RC 的概要使用流程圖
圖 3-5 建立外流場與噴孔片的模型
圖 3-6 噴口處與液滴飛行的外流場處等細微部分再做微小分割
圖 4-1 驗證案例的幾何尺寸
圖 4-2 震盪片孔徑 34μm實驗拍攝與模擬畫面(驗證案例)
圖 4-3 震盪片噴孔孔徑與液滴體積、速度圖
圖 4-4 震盪片噴孔孔徑 24μm、14μm 噴射過程圖
圖 4-5 流道曲率示意圖
圖 4-6 流道曲率與速度關係圖
圖 4-7 a 流道與 b 流道壓力分佈圖
圖 4-8 流道壓力分佈圖(流道 e)
圖 4-9 流道曲率與主液滴體積關係圖
圖 4-10 流道曲率與斷裂時間關係圖
圖 4-11 內流線分佈圖(c 流道)
圖 4-12 振動幅度 0.25μm 的回流位置分佈圖
圖 4-13 振動幅度 1μm 的回流位置分佈圖
圖 4-14 不同接觸角的主液滴斷裂時間關係圖
圖 4-15 不同接觸角的主液滴飛行速度關係圖
圖 4-16 不同接觸角的主液滴體積關係圖
圖 4-17 不同振動頻率下不同曲率流道的主液滴速度關係圖
圖 4-18 不同振動頻率下不同曲率流道的主液滴體積關係圖
圖 4-19 不同振動頻率下不同曲率流道的主液滴斷裂時間關係圖
圖 4-20 b 流道與 d 流道的液柱長度比較
圖 4-21 振動幅度 1μm 與 0.25μm 的斷裂圖(c 流道)
圖 4-22 振動頻率 100k 與 200k 斷裂圖(c 流道)
圖 4-23 流道曲率與殘液關係圖