Dynamics of the wall thermal boundary layer at the initial stage of the nucleate boiling

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

Levin, A.A.^1 ; Safarov, A.S.^1 ; Khan, P.V.^1

Melentiev Energy Systems Institute Siberian Branch, Russian Academy of Sciences, Lermontov St. 130, Irkutsk

664033, Russia^1

关键词: Bubble departure diameter;    Comsol multiphysics;    Departure diameter;    Field temperature;    Numerical calculation;    Predictive models;    Temperature growth;    Thermal boundary layer;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/754/4/042010/pdf
DOI  :  10.1088/1742-6596/754/4/042010

来源: IOP

【 摘 要 】

This paper presents the results of the experimental study of the water nucleate boiling on the surface of the cylinder heater. We investigated the initial stage of formation of the thermal boundary layer with rise and departure of bubbles with the departure diameter of 50 μm. To build the field temperature at the moment prior to the start of boiling, we used a numerical model implemented in the COMSOL multiphysics software. The experimental data on bubbles dynamics was compared to the numerical calculation of the temperature, and the relationship between the temperature growth rate, the bubble departure diameter and the Jacob number was established. The outcome results demonstrated that the non-transient heat influences the departure diameter and we need to employ the modified Jacob number to build predictive models.