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首页> 外文期刊>Journal of Chemical Engineering of Japan >Study of Transitional Velocities of Solid-Liquid Micro-circulating Fluidized Beds by Visual Observation
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Study of Transitional Velocities of Solid-Liquid Micro-circulating Fluidized Beds by Visual Observation

机译：目视观察研究固液微循环流化床的过渡速度

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Solid-liquid micro-fluidized beds (FBs), i.e., fluidization of micro-particles in sub-centimetre beds, hold promise in applications in the micro fluidics and micro-process technology context. This is mainly due to fluidized particles providing enhancement of mixing, mass and heat transfer under the low Reynolds number flows that dominate in micro-devices. Although there are quite few studies of solid-liquid micro-fluidized beds, we are presenting the first study of a micro-circulating fluidized bed. The present experimental research was performed in a micro-circulating fluidized bed which was made by micro-machining channels of 1 mm(2) cross section in Perspex. PMMA and soda lime glass micro-particles were used as the fluidized particles and tap water as the fluidizing liquid to study flow regime transition for this micro-circulating fluidized bed. The results are in line with the macroscopic observation that the critical transition velocity from fluidization to circulating regime is very dependent on solid inventory, but once the inventory is high enough it is approximately equal to the particle terminal velocity. However, the transitional velocity is weakly dependent on wall effect and surface forces conforming the importance of these two properties in a micro-fluidized bed system. Similarly, the transitional velocity to transporting regime is a strong function of surface forces. Finally, combining these results with our previous result on conventional fluidization the map of solid-liquid fluidization in a micro-circulating fluidized bed system is constructed showing conventional fluidization, circulating fluidization and a transport regime.
机译：固液微流化床（FBS），即亚厘米床中微粒的流化，在微流体和微工艺技术背景下占据应用中的承诺。这主要是由于流化颗粒，提供了在微型器件中占主导地位的低雷诺数流动下的混合，质量和热传递的增强。虽然对固液微流化床的研究相当少，但我们正在提出对微循环流化床的第一研究。本实验研究在微循环流化床中进行，其通过Perspex中的1mm（2）横截面的微加工通道制成。 PMMA和钠钙玻璃微粒用作流化颗粒，自来水作为流化液体，以研究该微循环流化床的流动调节。结果符合宏观观察，即流化到循环状态的临界过渡速度非常依赖于固体库存，但是一旦库存足够高，它大致等于粒子终端速度。然而，过渡速度弱依赖于壁效应和表面力，符合这两个性质在微流化床系统中的重要性。类似地，传送制度的过渡速度是表面力的强函数。最后，通过先前的结果与常规流化的结果相结合，在微循环流化床系统中的固体流化映射的图构造出常规流化，循环流化和传送方案。

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