Two-phase microfluidics: thermophysical fundamentals and engineering concepts

All-Russian Conference with the School for Young Scientists “Thermophysics and Physical Hydrodynamics –2016”

Kuznetsov, V.V.^1,2

Institute of Thermophysics Siberian Branch of Russian Academy of Sciences 1, Academician Lavrentyev Av., Novosibirsk

630090, Russia^1

Novosibirsk State University, Pirogova Str. 2, Novosibirsk

630090, Russia^2

关键词: Engineering concepts;    Explosive evaporation;    Homogeneous nucleation;    Numerical calculation;    Pressure field;    Superheated liquids;    Thermophysical;    Thin film heaters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/754/3/032012/pdf
DOI  :  10.1088/1742-6596/754/3/032012

来源: IOP

【 摘 要 】

Thermophysical fundamentals and engineering concepts of the two-phase microfluidic devises based on controlled liquid decay are discussed in this paper. The results of an experimental study of the explosive evaporation at a thin film heater of the MEMS devise in application to thermal inkjet printing are presented. The peculiarities of homogeneous nucleation and bubble growth in the liquid subjected to pulse heating are discussed. Using experimental data a simple equation suitable for predicting the growth rate of a vapor bubble in a non-uniformly superheated liquid was obtained and used to complete a mathematical model of the self-consistent nucleation and vapor bubbles growth in the induced pressure field. The results of numerical calculations according to the proposed model showed good agreement with the experimental data on a time of nucleation and duration of the initial stage of an explosive evaporation of water.