淡江大學機構典藏:Item 987654321/94367
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    题名: 側流對水旋風分離器粒子分離的影響
    其它题名: Effects of side outlet stream of a hydrocyclone on particle separation
    作者: 張碩程;Chang, Shuo-cheng
    贡献者: 淡江大學化學工程與材料工程學系碩士班
    吳容銘
    关键词: 水旋風分離器;計算流體力學;側流;Hydrocyclone;CFD;Side outlet stream
    日期: 2013
    上传时间: 2014-01-23 14:28:49 (UTC+8)
    摘要: 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.
    显示于类别:[化學工程與材料工程學系暨研究所] 學位論文

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