- 學位論文
新型微氣泡產生器之開發與研究
The Development and Investigation of the Innovative Micro-bubble Generator
摘要
本研究擬自行設計開發出新型微氣泡產生器用以改善大眾過度使用合成清潔劑而導致環境汙染和資源浪費等問題。根據白努力(Bernoulli)定律，改變水流速，使靜壓下降，管內壓力達到負壓時，空氣會自動吸入管內形成氣泡。再透過在管內增加內膛線設計迫使混合流體在管內旋轉造成紊流，達到氣泡細化之目的。 本研究首先利用力平衡模型推導氣泡在垂直流場中的成型模式，經過適當簡化後，求得高速流場下氣泡尺寸預測解析解。並架設可視化實驗系統，透過改變水流速度、內膛線數量以及內膛線螺距等不同參數觀察平均氣泡粒徑變化，同時驗證氣泡尺寸預測式。 依實驗量測結果，本研究提出理論值與實際值趨勢相同。另外發現，當在低流速時，在管內增加內膛線數量可以有效的使氣泡細化，但在高流速時，氣泡細化則是完全由水流速度決定。經過實驗結果，本研究開發之新型微氣泡產生器可以產生約100μm之細微氣泡。
並列摘要
The study intends to develop a new micro-bubble generator for solving the crisis caused from the excessive use of synthetic detergents. According to Bernoulli’s equation, changing the water velocity leads to the static pressure drop. When the tube pressure is lower than the atmospheric pressure, air will automatically inhale into the tube and form the bubbles. Then using the internal rifle ribs design to force mixed fluid in pipe to rotate and create turbulence. Achieve the goal of the bubble refinement. By the construction of force equilibrium model, the study derived the bubble size prediction exact solution under the high speed flow field. And use a visualization experiment system to observe the average bubble size variation in different water velocity, the number of rifles and the pitch of rifles, and validate the bubble size prediction equation as well. According to the experimental measurement results, the theoretical values have the same trend with the actual values. In addition, in the low-velocity field, increasing the rifling quantity can effectively make the bubble refinement; however, in the high-velocity flow field, bubble refinement is completely determined by the water flow velocity not the rifling quantity. According to the results, the research and development of new micro-bubble generator can produce about 100μm of fine bubbles.