本研究建立一套二維振動流體化床系統，探討在不同氣體流速比與振動強度條件下，顆粒混合物的流動行為與分離效果。實驗以兩種不同粒徑之ABS塑膠圓球為顆粒，透過調變氣體流速比與無因次振動加速度，觀察床層壓力降變化與膨脹高度，並進一步分析顆粒分離強度、濃度分布及體積中心等參數，以探討顆粒在床層中的分離與混合行為。 實驗結果顯示，床層壓力降會隨氣體速度的增加而上升，直至氣體速度達到臨界值，使顆粒進入流體化狀態。此時壓力降達到最大值，隨著氣體速度進一步提高，氣體向上的作用力與顆粒重量平衡，並趨於穩定。膨脹高度方面，在無振動條件下，床層膨脹高度隨氣體流速增加而明顯上升，然而，其波動幅度較大，顯示床層流動較不穩定。引入振動後，膨脹高度隨時間的波動趨於平緩，顯示振動有助於氣泡破碎與分散，進而提升床層穩定性；當振動強度進一步提高時，甚至可觀察到高度被抑制的現象。 在分離強度方面，無振動條件下，當氣體流速比介於1.05至1.2之間時，顆粒分離效果最佳；但當氣體流速或振動強度過高時，分離效果明顯下降，顆粒趨於混合。從濃度分布結果可觀察到，在中等振動條件下，小顆粒能有效穿透大顆粒區域並上升至床層頂部，形成明顯的分層結構；但在高振動強度下，該分層界線變得模糊，顯示原有分層結構遭到破壞，導致混合行為發生。體積中心的變化亦驗證此趨勢。在中振動條件下，小顆粒的體積中心在實驗初期迅速上升，與大顆粒產生穩定高度落差，顯示良好的分層效果；然而，在高振動與高氣流條件下，兩種顆粒的體積中心呈現交錯且持續波動的狀態，顯示顆粒長時間處於混合與重排過程中，難以建立穩定分層結構。 ;This study investigates the flow behavior and separation performance of particle mixtures in a two-dimensional vibrated fluidized bed under various velocity ratios and vibration strengths. Two sizes of ABS plastic spheres were used. By adjusting the gas velocity ratio and vibration strengths, changes in bed pressure drop and expansion height were recorded. In addition, the separation strength, concentration distribution, and particle centroid heights were analyzed to understand particle layering and mixing behavior. The results showed that the pressure drop increased with velocity ratio until reaching fluidization, after which it stabilized. Without vibration, the bed expanded with increasing gas flow but showed unstable movement. Introducing vibration helped stabilize the bed by reducing fluctuations and promoting bubble breakup. At higher vibration strengths, the bed expansion was even suppressed. Regarding separation, the best results were seen at lower velocity ratios without vibration. Excessive gas flow or strong vibration led to poor separation and more mixing. At moderate vibration strengths, smaller particles were able to move upward through the larger ones, forming a clear layered structure. However, strong vibration blurred this layering, resulting in mixing. The volume centers data supported these observations: under moderate conditions, a clear and stable height gap between the two particle types was observed. At higher velocity ratios or vibration strengths, the volume centers fluctuated and overlapped, indicating continuous mixing and particle rearrangement.
