Experiemental Studies of Intra-Particle Forced Convection in Large-Pore Materials

大孔材料颗粒内强制对流的实验研究

• 批准号: 9311457
• 负责人: James Hsu
• 金额: $ 5.97万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-01 至 1995-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9311457&HistoricalAwards=false
• 关键词: Experiemental; Studies; Intra; Particle; Forced

9311457 Hsu Large-pore materials have been used in many chemical engineering applications such as catalysis, chromatography, ceramic membranes, adsorption and immobilized cell fermentation. In each case, the effectiveness of the material is believed to be enhanced by intraparticle forced convection which improves the intraparticle mass transfer. Several investigators have presented models of this phenomenon which are intended to provide methods of predicting the performance of these materials under various operating conditions. However, all of the models rely on theoretical estimates of the intraparticle velocity in determining the mass transfer rates without providing experimental confirmation. This project seeks to measure the intraparticle velocity versus pressure drop relationship using a unique particle flow apparatus. Analysis of the results will provide a quantitative measure of Darcy's constant for the particle. This constant can then be used in any pressure gradient field, including packed and fluidized beds, to determine the corresponding intraparticle fluid flow field. Knowledge of this field will allow for the development of a more comprehensive model of intraparticle mass transfer which includes both diffusion and convection. Such a model should be applicable to any type of process which uses the large-pore materials and therefore can be used to determine their optimum operating conditions. ***

小行星9311457 大孔材料在化工领域有着广泛的应用，如催化、色谱、陶瓷膜、吸附和固定化细胞发酵等。 在每种情况下，认为材料的有效性通过改善颗粒内传质的颗粒内强制对流而增强。 一些研究人员已经提出了这种现象的模型，旨在提供预测这些材料在各种操作条件下的性能的方法。 然而，所有的模型依赖于理论估计的颗粒内速度在确定的传质速率，而不提供实验确认。 该项目旨在使用一种独特的颗粒流装置测量颗粒内速度与压降的关系。 对结果的分析将提供颗粒达西常数的定量测量。 然后，该常数可用于任何压力梯度场，包括填充床和流化床，以确定相应的颗粒内流体流场。 这一领域的知识将允许一个更全面的模型，包括扩散和对流的颗粒内传质的发展。 这样的模型应该适用于任何类型的过程中，使用的大孔材料，因此可以用来确定其最佳的操作条件。 ***