多进口涡流混合器的表征
作者单位：华东理工大学
学位级别：硕士
导师姓名：郭旭虹
授予年度：2014年
学科分类：080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理]
主 题：mixer mixing inlet turbulent turbulence Figure dissipation outlet viscosity length
摘 要：Process intensification is a emerging field in chemical engineering trying to improve the effectiveness of production in the chemical engineering industry. One way of achiev-ing this is miniaturising the equipment by using micro reactors which have been shown to give very low mixing time due to their initially small length scales. To add to the quickly increasing amount of knowledge in the field of micro reactors this study char-acterised the mixing effectiveness of different geometry modifications of a Multi-Inlet Vortex Mixers (MIVMs) using a the fourth Bourne competitive reaction scheme. Com-putational Fluid Dynamic (CFD) simulations of the reaction in the mixers was also produced and showed good agreement with experimental values for segregation index. Three different geometry modifications, scale up and down was also tested using CFD. Using the Interaction by Exchange with the Mean (IEM) method the characteristic mix-ing time for the mixers was found and compared with results from previous studies. It could be concluded that the MIVM is not comparable to true micro-scale mixers but give good mixing relative to its mass flow rate. Reducing the mixing chamber diameter or increasing the outflow diameter proved to give the best mixing performance while bigger inlets and size had smaller effect. This was found to be an effect of that more of the reaction took place where the energy dissipation is highest giving faster mixing. Finally a simple scaling law using the available data was used to facilitate future design.
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