A study on transition process to MEB by limiting boiling space

Kawakami, Kendai; Sakamoto, Shosuke; Tanigawa, Hirofumi; Tsuruta, Takaharu

doi:10.1299/jtst.2021jtst0004

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…In this technique, an interference plate, which can vibrate above a heat transfer surface because the plate is partially fixed or supported, is used as a BBR. Previous studies have revealed that the critical heat flux (CHF) is suppressed when an interference plate is positioned above a heat transfer surface [7][8][9]. By contrast, the BBR technique developed in our previous study [1] uses the energy of the growth and collapse of boiling bubbles to excite the interference plate and enhance boiling heat transfer.…”

Section: Introductionmentioning

confidence: 94%

Visualization and Sound Measurements of Vibration Plate in a Boiling Bubble Resonator

Ono

Unno

Yuki

et al. 2021

Fluids

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We developed a boiling bubble resonator (BBR) as a new heat transfer enhancement method aided by boiling bubbles. The BBR is a passive device that operates under its own bubble pressure and therefore does not require an electrical source. In the present study, high-speed visualization of the flow motion of the microbubbles spouted from a vibration plate and the plate motion in the BBR was carried out using high-speed LED lighting and high-speed cameras; the sounds in the boiling chamber were simultaneously captured using a hydrophone. The peak point in the spectrum of the motion of the vibration plate and the peak point in the spectrum of the boiling sound were found to be matched near a critical heat-flux state. Therefore, we found that it is important to match the BBR vibration frequency to the condensation cycle of the boiling bubble as its own design specification for the BBR.

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Section: Introductionmentioning

confidence: 94%

Visualization and Sound Measurements of Vibration Plate in a Boiling Bubble Resonator

Ono

Unno

Yuki

et al. 2021

Fluids

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“…(2020) and Kawakami et al. (2021) showed that the convection induced by bubble collapse and oscillation might be the avenue by which efficient heat transfer occurs in MEB. The experiments of Li et al.…”

Section: Introductionmentioning

confidence: 99%

“…(2020) and Kawakami et al. (2021) showed that restricting the space above the heating surface limited the development of near-wall convection and then inhibited the occurrence of MEB. However, adding an extra acoustic streaming to enhance the near-wall convection by ultrasound could trigger MEB in such a confined space (Li et al.…”

Section: Introductionmentioning

confidence: 99%

“…Different form nucleate boiling, no bubble departure has been observed in MEB where an oblate vapour bubble constantly attaches on the heating surface with partial collapse and volume oscillation (Tang, Yan & Sun 2015;Tang et al 2017;Kobayashi et al 2022). However, the recent studies of Tang et al (2019), Li et al (2020) and Kawakami et al (2021) showed that the convection induced by bubble collapse and oscillation might be the avenue by which efficient heat transfer occurs in MEB. The experiments of Li et al (2020) and Kawakami et al (2021) showed that restricting the space above the heating surface limited the development of near-wall convection and then inhibited the occurrence of MEB.…”

Section: Introductionmentioning

confidence: 99%

“…However, the recent studies of Tang et al (2019), Li et al (2020) and Kawakami et al (2021) showed that the convection induced by bubble collapse and oscillation might be the avenue by which efficient heat transfer occurs in MEB. The experiments of Li et al (2020) and Kawakami et al (2021) showed that restricting the space above the heating surface limited the development of near-wall convection and then inhibited the occurrence of MEB. However, adding an extra acoustic streaming to enhance the near-wall convection by ultrasound could trigger MEB in such a confined space (Li et al 2020).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bubble-induced oscillating flow in microbubble emission boiling under highly subcooled conditions

Tang

et al. 2023

J. Fluid Mech.

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Microbubble emission boiling (MEB), a phenomenon that occurs under highly subcooled boiling conditions, can achieve a high heat flux beyond critical heat flux. MEB has been observed to differ from nucleate boiling and is always accompanied by the emission of microbubbles from an oscillating bubble. The heat transfer mechanism of MEB differs from that of nucleate boiling and remains elusive. In this study, we measure the behaviour of a vapour bubble and its induced liquid flow simultaneously during subcooled boiling using the high-speed two-phase particle image velocimetry method. Different from nucleate boiling, we observe a rapid oscillating flow outside the bubble that constantly attaches on the heating surface in MEB. The spatially and temporally averaged velocity magnitude values under this oscillating flow, and their dependency on liquid subcooling and heat flux, are quantified. Then we derive a scaling law for the heat transfer of MEB as a function of Péclet and Jacob numbers. With such correlations, we suggest that the oscillating flow induced by bubble oscillations is important to MEB, thus elucidating a different heat transport process from nucleate boiling.

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On homogeneity of vapor bubbles’ oscillation and corresponding heat transfer characteristics and boiling sound in microbubble emission boiling (MEB)

KOBAYASHI

Hayashi

Kurose

et al. 2022

International Journal of Heat and Mass Transfer

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A study on transition process to MEB by limiting boiling space

Cited by 8 publications

References 18 publications

Visualization and Sound Measurements of Vibration Plate in a Boiling Bubble Resonator

Visualization and Sound Measurements of Vibration Plate in a Boiling Bubble Resonator

Bubble-induced oscillating flow in microbubble emission boiling under highly subcooled conditions

On homogeneity of vapor bubbles’ oscillation and corresponding heat transfer characteristics and boiling sound in microbubble emission boiling (MEB)

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