摘要
为提升微反应器制备含能材料的热安全性,采用基于有限体积法的计算流体力学模拟仿真方法,对螺旋微反应器内结构参数对流动与传热的影响规律进行了研究。结果表明,在螺旋微通道中,连续流动的流体在离心力的影响下会产生连续的二次流扰动方向变化,有助于增强流体的传热性能。增大螺旋微反应器的曲率、减小无量纲螺距值和增大流体流速,能够有效提升努塞尔数和控制沿程阻力系数。螺旋微反应器的传热性能存在“放大效应”,当螺旋管管道半径放大到2.5 mm以上时,热阻系数增大,传热性能降低。将螺旋管的管道半径控制在2.5 mm,能够在维持较高传热性能的同时,使换热流体通量增大了25倍,且压降降低了98.9%。
To enhance the thermal safety of microreactors utilized for preparing energetic materials,a computational fluid dynam⁃ics simulation based on the finite volume method was employed to investigate the impact of structural parameters on flow and heat transfer in a spiral microreactor.The findings reveal that centrifugal force induces continuous directional secondary flow dis⁃turbance within the spiral channel,thereby augmenting fluid heat transfer performance.Increasing the curvature of the spiral mi⁃croreactor,reducing the dimensionless pitch value,and elevating fluid velocity effectively enhance Nusselt number while con⁃trolling drag coefficient along the reactor path.Notably,scaling up beyond a radius of 2.5 mm leads to a significant decline in heat transfer performance of a spiral microreactor exhibits a scale⁃up effect,with a significant decrease in heat transfer perfor⁃mance for spiral microreactors.By maintaining a controlled radius at 2.5 mm,high heat transfer performance can be sustained even with a 25 times increase in heat transfer fluid flux and an impressive 98.9%reduction in pressure drop.
作者
李玉光
袁飞
赵双飞
聂莹莹
赵跃
何伟
郭凯
LI Yu-guang;YUAN Fei;ZHAO Shuang-fei;NIE Ying-ying;ZHAO Yue;HE Wei;GUO Kai(Institute of Nanjing Advanced Biomaterials&Processing Equipment,Nanjing 211299,China;College of Biotechnology and Pharmaceutical Engineering,Nanjing Tech University,Nanjing 211816,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2024年第3期289-297,共9页
Chinese Journal of Energetic Materials
基金
国家重点研发计划(2021YFC2101900)。
关键词
微反应器
强化传热
结构参数
尺度放大
数值模拟
microreactors
enhanced heat transfer
structural parameters
scaling up
numerical simulation
