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文章编号： 1672-6987（2023）02-0061-09； DOI： 10.16351/j.1672-6987.2023.02.009
党漭， 白文娟*， 何燕*（青岛科技大学 机电工程学院，山东 青岛 266061）
摘要： 基于欧拉-欧拉双流体模型，对无分布板式锥形鼓泡流化床内碳纳米管的膨胀行为进行了数值模拟。考察了不同的颗粒当量直径计算方法及不同种类碳纳米管对床层膨胀能力的影响、不同表观风速下床内两相结构的体积分数分布及膨胀特性。模拟结果显示：碳纳米管的当量直径计算结果对床高有至关重要的影响，其当量直径越大，膨胀率越小，垂直阵列管床层膨胀高度大于聚团管，在低入口气速的情况下存在“局部流化”的特性，气泡在上升过程中逐渐变小甚至消失，随着入口气速的增加，气泡大小逐渐增加，床层膨胀率也逐渐增加。模拟与实验结果对比良好。
关键词： 碳纳米管； 锥形流化床； 数值模拟； 膨胀特性
中图分类号： TB 14文献标志码： A
引用格式： 党漭， 白文娟， 何燕. 锥形流化床内碳纳米管膨胀特性的数值模拟［J］. 青岛科技大学学报(自然科学版), 2023, 44(2): 61-69.
DANG Mang, BAI Wenjuan, HE Yan. Simulation study on expansion characteristics of carbon nanotubes in a conical fluidized bed［J］. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2023， 44（2）： 61-69.
Simulation Study on Expansion Characteristics of Carbon
Nanotubes in a Conical Fluidized Bed
DANG Mang, BAI Wenjuan, HE Yan
(College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China)
Abstract: Based on the Euler-Euler two-fluid model, the expansion behavior of carbon nanotubes in a non-distributed plate-shaped conical bubbling fluidized bed was numerically simulated. The effects of different particle equivalent diameter calculation methods and different types of carbon nanotubes on the bed expansion capacity, the volume fraction distribution and expansion characteristics of the two-phase structure in the bed at different apparent wind speeds were investigated. The simulation results show that the calculation result of the equivalent diameter of carbon nanotubes has a crucial impact on the bed height. The larger the equivalent diameter, the smaller the expansion rate. The expansion height of the vertical array nanotube bed is greater than that of the agglomerate nanotube. In the case of low inlet gas velocity, there is a “local fluidization” characteristic, the bubbles gradually become smaller or even disappear during the ascent process. As the inlet gas velocity increases, the bubble size gradually increases, and the bed expansion rate also gradually increases. The simulation results are compared with the experiments, and they are in good agreement.
Key words: carbon nanotubes; conical fluidized bed; numerical simulation; expansion characteristics
收稿日期： 2022-05-11
基金项目： 国家自然科学基金项目（51676103）；泰山学者工程项目（ts20190937）.
作者简介： 党漭(1996—)，男，硕士研究生.*通信联系人.
