Investigation of wall temperature and heat flux distribution during nucleate boiling in the presence of an electric field and in variable gravity

Schweizer, Nils; Marco, Paolo Di; Stephan, Peter

doi:10.1016/j.expthermflusci.2012.08.002

Cited by 30 publications

(6 citation statements)

References 12 publications

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“…Although different models in literature predicts the formation of the microlayer when boiling FC-72, we shown that there is no evidence of microlayer formation, which indicates that the triple contact line evaporation accounts for almost all the evaporation term in the heat flux partitioning. This is consistent with the observations of other investigators [15]. We evaluated the contribution of the TCL evaporation and quenching mechanistically showing that they can account for almost all the heat transfer in the nucleate boiling regime.…”

Section: Discussionsupporting

confidence: 91%

Experimental investigation of electrically enhanced boiling of FC 72 using high-resolution phase-detection diagnostics

Graffiedi,

Garivalis,

Marco

et al. 2024

J. Phys.: Conf. Ser.

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This work features the boiling of FC72 on a transparent sapphire substrate. Tests are performed using a thin ITO film (indium tin oxide) coated on the sapphire substrate as the heat source, a fast speed video camera to capture the boiling process using a technique to track the phase (liquid or vapor) in contact with the heating surface, an InfraRed video camera to capture the average temperature on the surface, and a metallic grid to impose an electric field perpendicular to the boiling surface. The maximum average electric field tested in this work is 3.3kV/mm, which led to a 18% increase of the critical heat flux. This study analyses in detail the phase distribution data showing that (1) there is no evidence of microlayer formation, and suggesting that (2) the triple contact line evaporation accounts for approximately 20% of the total heat flux, while (3) the quenching stage accounts for approximately 80%. Finally, phase distribution images are processed to characterize the size of vapor patches, showing that a boiling crisis occurs when the distribution of the vapor patches becomes scale-free, and corroborating the hypothesis that the boiling crisis can be modelled as a bubble interaction instability using a percolation model.

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Section: Discussionsupporting

confidence: 91%

Experimental investigation of electrically enhanced boiling of FC 72 using high-resolution phase-detection diagnostics

Graffiedi,

Garivalis,

Marco

et al. 2024

J. Phys.: Conf. Ser.

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“…It is important for its application in many industries and for the synthesis of materials. Many researchers have studied the effect of the electric field on bubble dynamics 5 – 10 . Tomar et al simulated the heat and mass transfer rates in the film’s boiling region and under the influence of a uniform electric field.…”

Section: Introductionmentioning

confidence: 99%

Single-bubble EHD behavior into water two-phase flow under electric-field stress and gravitational acceleration using PFM

et al. 2021

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In this study, single-bubble electro-hydrodynamic effects on the two-phase laminar flow of water under electric field stress are investigated using numerical modeling. A 2D axisymmetric model is also developed to study the growth and departure of a single bubble. The phase-field method is applied to track the interphase between liquid and gas. The growth of the attached vapor bubble nucleus to a superheat at 7.0 °C and 8.5 °C are evaluated with 50° and 90° contact angles. The results show that the enhancement of the contact angle changes the velocity and temperature fields around the bubble. It is observed that the growing size and base of the bubble is increased with increasing the wall superheat, but the bubble departure diameter and time are decreased. The electric field results in raising the number of detached bubbles from the superheat at a certain time interval but decreasing the bubbles departure size. Additionally, the formation of stretched bubbles enhances the rate of heat flux and there is a non-linear relationship between the applied voltage and heat flux.

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“…Electrohydrodynamic (EHD) is an effective way to enhance the boiling heat transfer under microgravity. Using experimental method, some researchers studied the effect of EHD on bubble dynamics and heat transfer during pool boiling [1][2][3][4][5][6]. These authors performed numerous experimental researches, obtained abundant experimental data and proved that an external electric field could obviously affect heat transfer and bubble dynamics during pool boiling.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on bubble dynamics during pool nucleate boiling in presence of a non-uniform electric field by LBM

Feng

Guo

et al. 2019

Applied Thermal Engineering

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• A numerical model was built to simulate the pool boiling under an electric field. • The single bubble nucleate boiling under a radial electric field was simulated. • A radial electric field could accelerate the departure of the vapor bubble. • Decreasing gravity could enhance the effect of electric field on bubble dynamics. • The total electric field force increased firstly and then decreased over time.

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Investigation of wall temperature and heat flux distribution during nucleate boiling in the presence of an electric field and in variable gravity

Cited by 30 publications

References 12 publications

Experimental investigation of electrically enhanced boiling of FC 72 using high-resolution phase-detection diagnostics

Experimental investigation of electrically enhanced boiling of FC 72 using high-resolution phase-detection diagnostics

Single-bubble EHD behavior into water two-phase flow under electric-field stress and gravitational acceleration using PFM

Numerical investigation on bubble dynamics during pool nucleate boiling in presence of a non-uniform electric field by LBM

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