方腔内温浓双扩散对流的PIV/PLIF实验研究  

Experimental Investigation of Temperature-Density Double-Diffusive Convection in a Square Cavity by PIV/PLIF

作　　者：邵立群 刘坤 刘嘉伟 李琼[1] 高文峰[1] 张国庆[1] SHAO Liqun;LIU Kun;LIU Jiawei;LI Qiong;GAO Wenfeng;ZHANG Guoqing(Yunnan Normal University,Kunming 650500,China)

机构地区：[1]云南师范大学,云南昆明650500

出　　处：《云南师范大学学报(自然科学版)》2025年第1期30-34,共5页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：国家自然科学基金资助项目(12262036);云南省基础研究计划资助项目(202301AT070064).

摘　　要：以不同质量浓度的NaCl溶液为实验流体,运用粒子图像测速(PIV)技术和平面激光诱导荧光(PLIF)技术,对方腔内的温浓双扩散对流现象进行了实验研究,得到方腔内溶液不同时间的温度场和速度场,探讨了温度梯度、浓度梯度和施密特数(Sc)和对流体的流动特性和传热行为的影响.实验结果表明,随着NaCl溶液浓度的增加,溶液的升温速率显著提高,自然对流的形成和扩展速度亦随之加快.较低的Sc有助于热量快速传递和均匀分布,且能增强流体对流运动,进而提高热传递和质量传递效率.This study conducted experimental investigations on the double-diffusive convection phenomenon of temperature and concentration within a square cavity,using NaCl solutions of different mass concentrations(0%,1%,and 3%)as the experimental fluids.Initially,a combination of Particle Image Velocimetry(PIV)and Planar Laser-Induced Fluorescence(PLIF)techniques was employed to obtain the temperature and velocity fields of the solution within the square cavity at various time points.Subsequently,the effects of temperature gradient,concentration gradient,and Schmidt number(Sc)on the flow characteristics and heat transfer behavior of the fluid were explored.The experimental results indicated that as the concentration of the NaCl solution increased,the heating rate of the solution significantly improved,and the formation and propagation speed of natural convection accelerated accordingly.A lower Schmidt number facilitated rapid heat transfer and uniform distribution,enhancing fluid convective motion and,improving both heat and mass transfer efficiencies consequently.

关 键 词：PIV/PLIF 方腔 温浓双扩散对流 

分 类 号：R68[医药卫生—骨科学]