TY - JOUR

T1 - Nucleation and bubble evolution in subcooled liquid under pulse heating

AU - Surtaev, Anton

AU - Serdyukov, Vladimir

AU - Malakhov, Ivan

AU - Safarov, Alexey

N1 - Funding Information: The reported study was supported by the Russian Science Foundation , project no. 19-19-00122 . Publisher Copyright: © 2021 Elsevier Ltd Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/4

Y1 - 2021/4

N2 - The transient heating of liquid using a local heat source is widely used in practice including MEMS and laser medicine technologies. In particular the laser heating of liquid through the optical fiber has become a widespread method for obliteration of varicose veins (endovenous laser ablation, EVLA) and treatment of cysts of various localization. In this research there is proposed to use the electrically heated transparent microheater based on ITO film to simulate the laser-induced heating of the subcooled liquid through the optical fiber. The paper reports the experimental results on the nucleation and evolution of vapor bubbles in subcooled water induced by pulsed heating of the microheater. The experiments were performed at the initial liquid temperature of 27, 38, and 51°C, with heating power in the pulse of 3.6 - 41W and pulse duration of 100–2000 ms using high-speed visualization and infrared thermography. The boiling and convection onsets, the rates of growth and condensation of vapor bubbles, and their maximum sizes depending on the heating power and the liquid initial temperature were measured. The development of convection before the boiling onset was shown to significantly affect the nucleation and further evolution of bubbles. It was found that at the stage of bubbles condensation, the shape of the interfacial surface significantly deviates from the spherically symmetric one, and the maximum condensation rate is observed at some distance from the heated surface. Using infrared thermography and numerical simulation, the time dependences of the ITO microheater and sapphire surface temperature for various heating power and initial liquid temperatures were obtained. On the basis of the temperature dependences and experimentally measured times of boiling onset, the nucleation temperatures were determined.

AB - The transient heating of liquid using a local heat source is widely used in practice including MEMS and laser medicine technologies. In particular the laser heating of liquid through the optical fiber has become a widespread method for obliteration of varicose veins (endovenous laser ablation, EVLA) and treatment of cysts of various localization. In this research there is proposed to use the electrically heated transparent microheater based on ITO film to simulate the laser-induced heating of the subcooled liquid through the optical fiber. The paper reports the experimental results on the nucleation and evolution of vapor bubbles in subcooled water induced by pulsed heating of the microheater. The experiments were performed at the initial liquid temperature of 27, 38, and 51°C, with heating power in the pulse of 3.6 - 41W and pulse duration of 100–2000 ms using high-speed visualization and infrared thermography. The boiling and convection onsets, the rates of growth and condensation of vapor bubbles, and their maximum sizes depending on the heating power and the liquid initial temperature were measured. The development of convection before the boiling onset was shown to significantly affect the nucleation and further evolution of bubbles. It was found that at the stage of bubbles condensation, the shape of the interfacial surface significantly deviates from the spherically symmetric one, and the maximum condensation rate is observed at some distance from the heated surface. Using infrared thermography and numerical simulation, the time dependences of the ITO microheater and sapphire surface temperature for various heating power and initial liquid temperatures were obtained. On the basis of the temperature dependences and experimentally measured times of boiling onset, the nucleation temperatures were determined.

KW - Boiling onset

KW - Bubble dynamics

KW - High-speed experimental techniques

KW - ITO microheater

KW - Pulsed heating

KW - Subcooled liquid

UR - http://www.scopus.com/inward/record.url?scp=85099635610&partnerID=8YFLogxK

U2 - 10.1016/j.ijheatmasstransfer.2021.120911

DO - 10.1016/j.ijheatmasstransfer.2021.120911

M3 - Article

AN - SCOPUS:85099635610

VL - 169

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

M1 - 120911

ER -