本研究採用直徑18.5 mm之水旋風分離器，使用黑色碳化矽粉末作為實驗粉體，並以計算流體力學軟體FLUENT進行模擬，討論當水旋風分離器圓柱部份改為具有側流時，對水旋風分離器分離現象的影響。以VOF多相流模式及LES紊流模式模擬水旋風分離器的流場狀態，並使用離散相模式(Discrete Phase Model)針對水旋風分離器中顆粒的運動行為進行分析，以討論側流功能對水旋風分離器分級效率的影響。

實驗與模擬結果顯示，當水旋風分離器具有適當的側流量時，對於顆粒的分級效率會有提升的效果。原因在於水旋風分離器圓柱區域亂流的情況較為嚴重，這會造成粒子在此區域運動軌跡複雜化，而降低分離的效率，因此在這區域內設置適當的側流量時，可以有效降低亂流的程度，使粒子運動軌跡簡化，並減少在水旋風分離器內的滯留時間，讓粒子更有效率的進行分離，因此具有側流功能的水旋風分離器對於提升分離效率有一定程度的貢獻。

In this essay, we used 18.5mm diameter hydrocyclone in my experimental device, with black silicon carbide as experimental particulates Fluent, a simulation program, to do process simulation. Furthermore, we discussed the separation of the hydrocyclone when we increased the stream of side outlet in the cylinder. also, we compared the performance as before. We simulated the status of the flow pattern, which is inside of the hydrocyclone. At the same time, we set discrete phase model to analyze the motivation of particulates for observing the efficiency of classification.
As a result, the classifying efficiency of particulates will increase after we set the stream of side outlet. The reason is the hydrocyclone, which is traditional, will produce turbulence easily. After that, this situation will cause particulates to take more long time to leave the cylinder. That’s the reason why classification will be decreased. However, when we set the stream of side outlet, it will decrease the effect which is caused by turbulence. The space time of particulates will shorter than before. The particles will separate efficiently. In conclusion, we can say with reasonable confidence that the separation of the hydrocyclone will improve when it is set with the stream of side outlet.

中文摘要		Ⅰ
英文摘要		Ⅱ
目錄		Ⅲ
圖表目錄		Ⅵ

第一章 緒論		1
  1-1 前言		1
  1-2 研究動機與目的		2

第二章 文獻回顧		3
  2-1 水旋風分離器之發展概論		3
    2-1-1水旋風分離器歷史發展		3
    2-1-2 水旋風分離器之結構與簡介		4
    2-1-3 水旋風分離器的優缺點		6
  2-2 水旋風分離器之特殊現象		7
    2-2-1短路流現象		7
    2-2-2循環流	.7
    2-2-3 空氣柱現象	.8
    2-2-4 魚勾現象		8
  2-3 數值計算在水旋風分離器的應用	10

第三章 理論與數值計算方法	17
  3-1 水旋風分離器的基本分離原理	17
    3-1-1 平行軌道理論	18
  3-2 固體顆粒在水旋風分離器流場中運動的受力分析	19
    3-2-1固體顆粒在流場中沉降的受力分析	19
    3-2-2兩相流動中的受力分析	21
    3-2-3水旋風分離器中的剪應力	23
  3-3影響水旋風分離器之參數	24
    3-3-1幾何結構對水旋風分離器的影響	24
    3-3-2物性參數對水旋風分離器的影響	26
    3-3-3操作參數對水旋風分離器的影響		27
  3-4無因次群組	29
  3-5數值計算方法	31
    3-5-1模擬軟體簡介		31
    3-5-2統御方程式	32
    3-5-3建立幾何形狀與網格	36
    3-5-4邊界條件設定	38
    
第四章 實驗的裝置與方法	39
  4-1 實驗物料	39
  4-2 實驗儀器與設備	40
  4-3 實驗水旋風分離器裝置	41
  4-4 實驗步驟	46

第五章 結果與討論	48
  5-1 水旋風分離器之分級效率	48
    5-1-1 實驗部分		48
    5-1-2模擬部分	52
    5-1-3模擬不同進口流率對分級效率之影響	54
    5-1-4薄膜管黏滯阻力對水旋風分離器之影響	55
  5-2模擬粒子運動軌跡	57

第六章 結論	68
符號說明	70
參考文獻	74

圖目錄
第二章
圖2-1 水旋風分離器裝置的結構示意圖		5
圖2-2 水旋風分離器的魚鉤現象		9

第三章
圖3-1 三種渦流半徑與切線速度的示意圖		18
圖3-2 模擬用的水旋風分離器網格		37

第四章
圖 4-1 碳化矽粉末之粒徑分佈圖		39
圖 4-2 揚程圖		40
圖 4-3 水旋風分離器本體結構與尺寸		42
圖 4-4 實驗使用的水旋風分離器照片		43
圖 4-5 實驗使用的燒結不鏽鋼管照片		44
圖 4-6 水旋風分離器整體裝置圖		45

第五章
圖5-1  THC溢流、進口及底流之累積粒徑百分比	49
圖5-2  SHC溢流、進口及底流之累積粒徑百分比	49
圖5-3  實驗不同側流量之分級效率	50
圖5-4  SHC模擬與實驗之分級效率(Inlet/(side outlet)=200)	52
圖5-5  SHC模擬與實驗之分級效率(Inlet/(side outlet)=250)	53
圖5-6  THC模擬與實驗之分級效率		53
圖5-7  模擬不同進口流速的分級效率圖	54
圖5-8  模擬不同側流量之分級效率圖(v=8.12 m/s)	55
圖5-9  粒子放入位置示意圖	58
圖5-10在No.5 粒子往底流移動的百分比	59
圖 5-11在No.6 粒子往底流移動的百分比	60
圖 5-12在No.6，不同粒徑下THC與SHC的粒子軌跡	61
圖 5-13在No.7 粒子往底流移動的百分比	62
圖 5-14在No.9 粒子往底流移動的百分比	63
圖 5-15在No.10 粒子往移動的底流百分比	64
圖 5-16在No.11 粒子往底流移動的百分比	64
圖 5-17在No.1 粒子往底流移動的百分比	65
圖 5-18在No.2 粒子往底流移動的百分比	65
圖 5-19在No.3 粒子往底流移動的百分比	66
圖 5-20在No.4 粒子往底流移動的百分比	66
圖 5-21在No.8 粒子往底流移動的百分比	67
圖 5-22在No.12 粒子往底流移動的百分比	67

表目錄

第五章
表 5-1進口及出口的重量百分率濃度	51

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