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

作　　者：禹言芳[1] 张埔瑜 孟辉波 孙雯 李雯 乔文龙 张梦琼 YU Yanfang;ZHANG Puyu;MENG Huibo;SUN Wen;LI Wen;QIAO Wenlong;ZHANG Mengqiong(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China;College of New Energy,China University of Petroleum,Qingdao 266580,Shandong,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110142 [2]中国石油大学(华东)新能源学院,山东青岛266580

出　　处：《化工学报》2025年第3期1040-1049,共10页CIESC Journal

基　　金：辽宁省教育厅重点项目(LJKMZ20220773);辽宁省自然科学基金项目(2024-MS-132);山东省自然科学基金项目(ZR2024ME067);青岛市自然科学基金原创探索项目(23-2-1-236-zyyd-jch);中国石油大学(华东)科研基金资助项目(R20220113)。

摘　　要：基于绿色仿生学理念,依据海螺的外形特点设计了一种三旋海螺型静态混合元件。在进口空管段Re_(t)=2640~11450的恒热通量传热实验中,采用压降(Δp)、范宁摩擦因数(f)和Z因子评价了Kenics型静态混合器(KSM)、正向三旋海螺型静态混合器(three-twisted conch static mixer,TCSM)和反向三旋海螺型静态混合器(reverse three-twisted conch static mixer,RTCSM)的能耗。基于Nusselt数(Nu)、对流传热系数(h)和综合传热系数(PEC)评价三种混合器的强化传热特性。结果表明,KSM、TCSM和RTCSM的h与空管相比分别提高22.15%~40.53%、10.83%~27.34%和33.29%~50.30%,RTCSM的PEC分别比TCSM和KSM增加9.41%~28.99%和4.94%~13.29%。此外,通过功率谱密度(PSD)和标度指数(ϕ)表征不同混合器进出口压力信号的湍流脉动特征,发现RTCSM能够产生更多的小尺度涡进而强化传热。出口处RTCSM的最大Lyapunov指数(λ)大于TCSM和KSM的λ,表明流体流经RTCSM后呈现更强的混沌特性。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(Re_(t))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,theϕof 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 theλof 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 

分 类 号：TQ053.6[化学工程]