兰姆波驱动微流体温度分布研究
Research on Temperature Distribution of Microfluidic Driven by Lamb Wave
顾赫 1梁威1
作者信息
- 1. 上海工程技术大学 机械与汽车工程学院,上海 201620
- 折叠
摘要
该文应用压电陶瓷器件激发频率1 MHz的兰姆波在非压电基板上进行了微流体温度分布的研究.经理论分析表明,兰姆波向流体中辐射纵波以及兰姆波在介质中传播时的粘性摩擦损失产生了声热效应.采用红外摄像机观察液滴从兰姆波激发直至达到稳态时的热分布变化,发现液滴在兰姆波入射一侧的温度高于其他区域且高温区域有向顶部扩散的趋势.观察不同液体黏度液滴的声热现象,发现油滴的温度扩散更均匀,动力学行为更弱.采用有限元分析声流和声热效应,发现液滴在顶部区域声流速最大,在声流作用下,液滴的高温区域扩散至顶部.
Abstract
Microfluidic temperature distribution on a non-piezoelectric substrate is studied using Lamb waves with 1 MHz excitation frequency in piezoelectric ceramics.Theoretical analysis demonstrates that the acoustothermal effect is induced by the Lamb waves radiating longitudinal waves into the fluid and viscous friction loss.An infrared camera observes the thermal distribution of droplets from Lamb wave excitation to a steady-state temperature.The droplet temperature on the Lamb wave radiation side is higher than that of other areas,and the high temperature ar-ea tends to spread to the top.Regarding the acoustothermal phenomena of droplets with different liquid viscosities,the temperature distribution of an oil droplet is more uniform and exhibits weaker dynamic behavior.Finite element analysis of the acoustic flow and thermal effect demonstrate that the droplet high temperature diffusion trend corre-sponds to the maximum acoustic flow inside the droplet.
关键词
兰姆波/非压电基板/声热效应/热分布/声流效应Key words
Lamb wave/non-piezoelectric substrate/acoustothermal effect/temperature distribution/acoustic flow effect引用本文复制引用
出版年
2024
NETL
NSTL
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