文献类型：期刊文献

英文题名：Pressure Drop and Residence Time Distribution in Carbon-Nanofiber/Graphite-Felt Composite for Single Liquid-Phase-Flow

作者：Cao, Yaojie[1];Li, Ping[1];Zhou, Jinghong[1];Sui, Zhijun[1];Zhou, Xinggui[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：50

期号：15

起止页码：9431

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20113114198445);WOS:【SCI-EXPANDED(收录号:WOS:000293196700064)】；

基金：We are grateful for the financial support by the NSFC (20776041, 20736011), and the 111 Project (B08021).

语种：英文

外文关键词：Liquids - Cyclohexane - Drops - Residence time distribution - Dispersions - Carbon nanofibers - Pressure drop

摘要：Fibrous carbon nanofiber composite is prepared by growing carbon nanofibers on graphite felt. Pressure drop experiments are carried out with ethanol solution to study the influence of the liquid surface tension on the permeability of the composite, and residence time distribution experiments with cyclohexane and water respectively are performed to study the effect of the fluid wettability on the flow behavior in the composite. Piston dispersion exchange (PDE) model is employed to determine the dynamic liquid holdup, the axial dispersion, and the mass transfer between the dynamic and static liquids. When the fluid is less oleophilic, less space in the CNF layer will be open for the flow, and the fluid will be more likely to slip over the carbon surface. Compared with the flow in spherical particle packing and in monolith, the mass transfer in the composite is high owing to its fibrous structure that splits the fluid into streamlets. The rate of mass transfer in water is lower than that in cyclohexane because water is only trapped in some of the large pores in the CNF layer while cyclohexane suffuses the whole layer.