Effect of the gap height between the vibration plate and heating surface on boiling heat transfer in a boiling bubble resonator

Unno, Noriyuki; Yuki, Kazuhisa; Taniguchi, Jun; Satake, Shin‐ichi

doi:10.1299/jtst.2021jtst0017

Cited by 5 publications

(8 citation statements)

References 26 publications

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“…Therefore, the gap height was adjusted using a 200 µm-thick spacer plate. These settings are the same conditions used in our previous work [2]. In the present study, a 100 µm-thick, 30 mm-long, and 10 mm-wide thin brass plate was used as the BBR.…”

Section: Experimental Setup and Measurement Methodsmentioning

confidence: 98%

“…Similar to the method used in ref. [2], by assuming one-dimensional heat conduction (the Fourier's law), we estimated the surface temperature from the temperature distribution data obtained by the three thermocouples. The heat flux on the heat transfer surface was also calculated from the product of the slope of the temperature distribution, as obtained by the least-squares method from the data recorded by the three thermocouples, and the thermal conductivity of the copper block.…”

Section: Experimental Setup and Measurement Methodsmentioning

confidence: 99%

“…The gap is also important for blowing out coalescent boiling bubbles because a narrow gap causes collisions between the BBR and a heat transfer surface. As a result, the BBR vibration is restricted and disturbs the CHF increasement [2]. Therefore, the gap height was adjusted using a 200 µm-thick spacer plate.…”

Section: Experimental Setup and Measurement Methodsmentioning

confidence: 99%

“…Therefore, the gap height was adjusted using a 200 µm-thick spacer plate. These settings are the same conditions used in our previous work [2].…”

Section: Experimental Setup and Measurement Methodsmentioning

confidence: 99%

“…We have previously proposed a new technique of using a boiling bubble resonator (BBR) [1][2][3] to enhance heat transfer in pool boiling without the conventional fabrication process associated with complex heat transfer surfaces [4][5][6]. 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.…”

Section: Introductionmentioning

confidence: 99%

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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: Experimental Setup and Measurement Methodsmentioning

confidence: 98%

Section: Experimental Setup and Measurement Methodsmentioning

confidence: 99%

Section: Experimental Setup and Measurement Methodsmentioning

confidence: 99%

“…Therefore, the gap height was adjusted using a 200 µm-thick spacer plate. These settings are the same conditions used in our previous work [2].…”

Section: Experimental Setup and Measurement Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Ono

Unno

Yuki

et al. 2021

Fluids

Self Cite

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Nucleate boiling enhancement on a pillar structure surface with selected surface vibration modes

Ke,

Mo,

Zhang

et al. 2024

International Communications in Heat and Mass Transfer

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Flow boiling heat transfer characteristics of two-phase flow in microchannels

Guo

Zhang

2022

AIP Advances

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A set of experimental platforms with widths of 0.5, 1.0, 1.5, and 2.0 mm was established to explore the mechanism of flow boiling bubble dynamics in microchannels, focusing on heat transfer characteristics, pressure loss, and two-phase flow pattern identification. Bubble flow, restricted bubble flow, and dry area were observed in all four channels. The appearance of flow pattern was related to flow rate and channel width. Under the condition of the same channel width, the initial heat flux of subcooled boiling gradually increased with increase in flow rate, and this change trend was close to the linear trend. Under the same flow rate, the initial heat flux of subcooled boiling increased with decrease in channel width. This condition was due to the faster flow rate of the working medium in the narrow channel, resulting in decrease of heating time. The increase in bubble generation frequency directly led to the increase in the wall heat transfer coefficient and the decrease in the bubble separation diameter. Mathematical analysis showed that under the condition of small flow, reduction of channel size led to reduction of the total wall heat transfer coefficient. In this condition, reduction of channel size cannot enhance heat transfer. With increasing volume flow rate, the range of hydrodynamic control area increased and the index decreased. When the flow rate was large, the total heat transfer coefficient increased greatly with the decrease in channel size. The theoretical values were in good agreement with the experimental data.

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Effect of the gap height between the vibration plate and heating surface on boiling heat transfer in a boiling bubble resonator

Cited by 5 publications

References 26 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

Nucleate boiling enhancement on a pillar structure surface with selected surface vibration modes

Flow boiling heat transfer characteristics of two-phase flow in microchannels

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