基于Fluent的气凝胶超临界干燥过程的数值模拟  

Numerical simulation of supercritical drying process of aerogel based on fluent

作　　者：应标 廖传华[1] YING Biao;LIAO Chuanhua(College of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《化工科技》2023年第1期55-59,共5页Science & Technology in Chemical Industry

基　　金：江苏省环保科研项目(2012031)。

摘　　要：为了探究气凝胶超临界干燥过程中工艺参数对其干燥速率的影响,利用ANSYS Workbench和FLUENT软件,建立了干燥釜和凝胶三维模型并模拟干燥过程中乙醇随时间的变化分布;此外,通过改变干燥温度和干燥压力研究干燥速率的变化情况。模拟结果表明,干燥速率随着压力的增大而增大,压力超过13 MPa,干燥速率上升趋势明显下降,而随着温度的上升干燥速率呈下降趋势,温度超过50℃,干燥速率下降趋势更为明显。合理地增加干燥压力,降低干燥温度有利于气凝胶的超临界干燥过程。In order to explore the influence of process parameters on the drying rate of aerogel in supercritical drying process,ANSYS Workbench and FLUENT software were used to establish a three-dimensional model of drying kettle and gel and simulate the change distribution of ethanol with time during the drying process.In addition,the change of drying rate was studied by changing the two parameters of drying temperature and drying pressure.The simulation results show that the drying rate increases with the increase of pressure.When the pressure exceeds 13 MPa,the increase of drying rate obviously decreases with the increase of temperature.When the temperature exceeds 50℃,the drying rate decreases more obviously.Therefore,reasonable increase of drying pressure and reduction of drying temperature are beneficial to the supercritical drying process of aerogel.

关 键 词：超临界二氧化碳 多孔介质 数值模拟 参数优化 

分 类 号：TQ110[化学工程—无机化工]