化工学报2025，Vol.76Issue(3)：1040-1049,10.DOI:10.11949/0438-1157.20241013
仿生海螺型静态混合器传热与湍流脉动特性实验研究
Experimental study on heat transfer and turbulent fluctuation characteristics of biomimetic conch static mixer
摘要
Abstract
Static mixer is a kind of efficient and energy-saving mixing equipment with broad applications in chemical engineering and environmental protection.The unique morphological structures of natural organisms provide rich inspiration for the design of high-efficiency equipment.The three-twisted conch static mixing element has been designed,which was inspired by the spiral shape of the conch.The enhanced heat transfer performance of the three-twisted conch static mixer(TCSM)and the reverse three-twisted conch static mixer(RTCSM)were evaluated and compared.In the constant heat flux heat transfer experiments,pressure drop(Δp),Fanning friction factor(f),and Z-factor were used to evaluate the performance of energy consumption.Meanwhile,Nusselt number(Nu),convective heat transfer coefficient(h),and preference evaluation criterion(PEC)were utilized to evaluate the enhanced heat transfer performance of different mixers at Reynolds numbers(Ret)ranging from 2640 to 11450.The results indicate that compared with the empty tube,the h of the Kenics static mixer(KSM),TCSM,and RTCSM are enhanced by 22.15%—40.53%,10.83%—27.34%,and 33.29%—50.30%,respectively.The PEC of the RTCSM is higher than that of TCSM and KSM by 9.41%—28.99%and 4.94%—13.29%,respectively.Additionally,the power spectral density(PSD)and scaling exponent(ϕ)of the pressure signal time series at the inlet and outlet of different mixers were analyzed.The results indicate that due to the large-scale macroscopic motion of the liquid phase,the PSD strength of KSM is greater than that of TCSM and RTCSM in the low-frequency range.Concurrently,the ϕ of RTCSM is lower than others,which indicates that RTCSM generates more small-scale vortices and dissipation leading to a higher energy proportion of the high-frequency range.The maximum Lyapunov exponent(λ)of RTCSM at the outlet is larger than the λ of TCSM and KSM,indicating that the fluid exhibits stronger chaotic characteristics after flowing through RTCSM.关键词
静态混合器/传热/湍流/PEC/功率谱密度/最大Lyapunov指数Key words
static mixer/heat transfer/turbulent flow/PEC/power spectral density/largest Lyapunov exponent分类
化学化工引用本文复制引用
禹言芳,张埔瑜,孟辉波,孙雯,李雯,乔文龙,张梦琼..仿生海螺型静态混合器传热与湍流脉动特性实验研究[J].化工学报,2025,76(3):1040-1049,10.基金项目
辽宁省教育厅重点项目(LJKMZ20220773) （LJKMZ20220773）
辽宁省自然科学基金项目(2024-MS-132) （2024-MS-132）
山东省自然科学基金项目(ZR2024ME067) （ZR2024ME067）
青岛市自然科学基金原创探索项目(23-2-1-236-zyyd-jch) （23-2-1-236-zyyd-jch）
中国石油大学(华东)科研基金资助项目(R20220113) （华东）
