由於蔬果與藥品等熱敏性顆粒體於乾燥製程中，往往因高溫導致營養流失與結構損壞等不利之影響。本研究於此脈絡下，以振動噴流床作為乾燥之設備，在不施加額外加熱，於近環境溫度下操作，以降低熱所帶來之因素，著重於探討流場與振動效應對於乾燥的影響。 實驗建立一類二維之振動噴流床系統，以不規則形狀石英砂作為乾燥之顆粒。實驗過程中，以高速攝影機拍攝顆粒流動影像，並透過粒子影像測速技術(PIV)分析顆粒速度場，藉此量化死區面積與噴流偏轉角等流場參數；同時於出口設置相對溼度感測器，量測乾燥過程中噴流氣體中溼度隨時間之變化，另以水分比(Xfinal/Xinitial)作為整體乾燥效果之量化指標，並據此氣體相對溼度與水分比，以計算乾燥速率與總水分排除量。實驗參數調整無因次振動加速度(Γ = 0-1.0)、流速比(U/Ums = 1.85、2.35、2.85)以及石英砂初始含水量(Xinitial = 0-2.0%)，藉由系統性調整上述三項參數，探討其對床內流場結構與乾燥效果之影響。 實驗結果顯示，床內流場可依顆粒運動特性區分為噴流區、環流區及噴泉區三個特徵區域，且流速比越高，顆粒流動性越強。就流場穩定性而言，隨初始含水量增加，死區面積與噴流偏轉角均隨之擴大，達到穩定所需之時間亦隨之延長；相對地，提高流速比或施加足夠強度之振動，皆可有效縮減死區面積並抑制噴流偏轉，然而當振動強度過低時，反而可能使死區面積擴大，顯示振動效應存在適當之強度範圍。就乾燥效果而言，石英砂之水分比隨振動強度與流速比之提升而下降，即代表可改善乾燥效果。;Heat-sensitive particulate materials， such as fruits， vegetables， and pharmaceuticals， are often subject to nutrient loss and structural damage caused by elevated temperatures during conventional drying processes. In this context， the present study employs a vibrated spouted bed as the drying apparatus， operating at near-ambient temperature without additional heating in order to minimize thermally induced effects， with particular emphasis on the influence of the flow field and vibration effects on drying performance. A quasi-two-dimensional vibrated spouted bed system was constructed， using irregularly shaped quartz sand as the drying medium. During the experiments， a high-speed camera was employed to capture particle flow images， and Particle Image Velocimetry (PIV) was applied to analyze the particle velocity field， thereby quantifying flow field parameters such as dead zone area and spout deflection angle. Simultaneously， a relative humidity sensor was installed at the outlet to measure the temporal variation of relative humidity in the spouting gas throughout the drying process. The moisture ratio (Xfinal/Xinitial) was adopted as an overall index of drying performance， and， based on the outlet relative humidity and moisture ratio， the drying rate and total moisture removal were calculated. Three experimental parameters were systematically varied: dimensionless vibration intensity (Γ = 0-1.0)， velocity ratio (U/Ums = 1.85， 2.35， and 2.85)， and the initial moisture content of the quartz sand (Xinitial = 0-2.0%)， in order to investigate their respective influences on the internal flow field structure and drying performance of the bed. The experimental results indicate that the flow field within the bed can be characterized by three distinct regions based on particle motion behavior: the spout region， the annulus (downflow) region， and the fountain region， with higher velocity ratios corresponding to enhanced particle mobility. In terms of flow field stability， both the dead zone area and the spout deflection angle increased with increasing initial moisture content， accompanied by a longer time required to reach a stable state. Conversely， increasing the velocity ratio or applying sufficiently strong vibration effectively reduced the dead zone area and suppressed spout deflection; however， excessively weak vibration intensity was found to enlarge the dead zone area instead， indicating that the vibration effect exhibits an optimal intensity range. With respect to drying performance， the moisture ratio of the quartz sand decreased with increasing vibration intensity and velocity ratio， indicating an improvement in overall drying performance.
