An investigation of microlayer beneath nucleation bubble by laser interferometric method

Study of thermal behavior of microlayer under vapor bubble at liquid boiling

“…Estimations obtained by this equation show that microlayer thickness on the stage of vapor bubble growth at boiling of water and ethanol ranged from 0.5 to 5 microns, which are in good agreement with the experimental data presented in the literature and obtained using laser interferometry [2,3]. In the future, on the basis of experimental data of the evolution of the temperature field under the individual vapor bubbles at boiling of water and ethanol, obtained in a wide range of heat fluxes using the high-speed infrared thermography with max.…”

“…In the growth stage of vapor bubble the regions with different heat transfer mechanism (microlayer region and area of dry spot in the center of nucleation site) appear. The boundary between different heat transfer modes is the triple contact line [2][3][4][5][6]. The area with a minimal temperature of the heater surface corresponds to microlayer region.…”

“…For example laser interferometric method is widely used in recent years to determine the thickness of the microlayer under single vapor bubbles at different time [2][3][4]. With the use of PIV technique authors [5] analyzed the hydrodynamics of microflows at bubble appearance, growth and detachment from the surface.…”

A theoretical model for nucleate boiling of nanofluids considering the nanoparticle Brownian motion in liquid microlayer

“…In fact, although it has been widely accepted that the growth of bubble on an active site is attributed to the evaporation of liquid microlayer, quantitative measurements and characterizations of liquid microlayer are still very rare. In recent years, a couple of experimental measurements were conducted by Gao et al [28], Jung and Kim [29] and Utaka et al [30][31][32] using various cutting-edge technologies, with the aim to characterize the dynamic process of liquid microlayer evaporation. These experimental measurements, although have not contributed to a theoretical model for the liquid microlayer, have provided important experimental data to estimate A lm and d lm in Eq.…”

Partial Nucleate Pool Boiling at Low Heat Flux: Preliminary Ground Test for SOBER-SJ10

“…Gao et al (2012) also measured dynamic characteristics of the microlayer beneath an ethanol vapor bubble by using high-speed camera technique and laser interferometric method, while more recently Jung and Kim (2014) measured simultaneously the microlayer shape beneath a de-ionized water vapor bubble by using total internal reflection technique and the temperature distribution on the heating surface by a high-speed, high-resolution infrared thermometry. They reported a wedge-shaped microlayer formed beneath the bubble during the growth period; as the bubble growth it was gradually depleted from the center, creating a dry spot.…”