Bubble dynamics and flow boiling instabilities in microchannels

Bogojevic, D.; Sefiane, Khellil; Duursma, Gail; Walton, A.J.

doi:10.1016/j.ijheatmasstransfer.2012.11.038

Cited by 76 publications

(14 citation statements)

References 32 publications

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“…The energy equation has the following form: (4) where S h is the energy source and its calculation will be discussed in Section 3. In the VOF model, the energy E is treated as mass-averaged and calculated as follows:…”

Section: Volume Of Fluid Modelmentioning

confidence: 99%

Effect of aspect ratio on saturated boiling flow in microchannels with nonuniform heat flux

Yan

2019

Heat Trans. Asian Res.

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Microchannel two‐phase flow is an effective cooling method used in microelectronics, in which the heat flux density is unevenly distributed usually. The paper is focused on numerical study the effect of aspect ratio on the flow boiling of microchannels with nonuniform heat flux. The heat source is a three‐dimensional (3D) integrated circuit. 3D microchannel model and volume of fluid method are coupled in numerical simulation. The results show that the aspect ratio has no relationship with the two‐phase pressure drop of the microchannel. It has a certain influence on the distribution of bubble shape. In terms of the heat transfer coefficient, the aspect ratio has a certain influence on a section of the inlet. Due to the nucleate boiling, the convective heat transfer in the remaining areas is the dominant factor and the average heat transfer coefficient is mainly determined by the heat flux at the bottom of the channel.

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Section: Volume Of Fluid Modelmentioning

confidence: 99%

Effect of aspect ratio on saturated boiling flow in microchannels with nonuniform heat flux

Yan

2019

Heat Trans. Asian Res.

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“…After coating 2-μm BCB epoxy on the basal chip, a die-to-die bonding process is performed between the basal chip and microfluidic channel chip, and the thin-film temperature sensors are fully integrated into the MCHS. Compared with the sensors fabricated on the outside surface of MCHS, the temperature sensors integrated inner microchannel is more accurate and less affected by the environment [ 7 , 16 , 17 ]. Moreover, the BCB epoxy as the bonding layer also works as a protective layer, which prevents the Pt thin-film temperature sensors from contacting the coolant directly.…”

Section: Design Considerations and Measurement Setupmentioning

confidence: 99%

“…In particular, as a significant factor for the reliability and performance of the MCHS, temperature instability has drawn more attention in recent years [ 14 , 15 ]. Many researchers point out that the temperature stability of a microchannel is more susceptible than macro or conventional channels [ 16 , 17 ]. However, most of the studies focus on the boiling state, where bubble generation, growth, and departure contribute to temperature fluctuation [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, most of the studies focus on the boiling state, where bubble generation, growth, and departure contribute to temperature fluctuation [ 18 , 19 , 20 ]. The coolant in such studies is under subcooled or saturated flow boiling state, where the temperature is usually higher than 65 °C [ 16 , 21 ]. There are few studies about the temperature fluctuation of MCHS with single phase coolant.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Temperature Fluctuation of Single-Phase Fluid Based Microchannel Heat Sink

Wang

et al. 2018

Sensors

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The temperature fluctuation in a single-phase microchannel heat sink (MCHS) is investigated using the integrated temperature sensors with deionized water as the coolant. Results show that the temperature fluctuation in single phase is not negligible. The causes of the temperature fluctuation are revealed based on both simulation and experiment. It is found that the inlet temperature fluctuation and the gas bubbles separated out from coolant are the main causes. The effect of the inlet temperature fluctuation is global, where the temperatures at different locations change simultaneously. Meanwhile, the gas bubble effect is localized where the temperature changes at different locations are not synchronized. In addition, the relation between temperature fluctuation and temperature gradient is established. The temperature fluctuation increases with the temperature gradient accordingly.

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“…Based on above values, Results showed that a single flow boiling regime were the fundamental reasons behind the significant heat transfer enhancements during flow boiling. Bogojevic D et al [35] were experimentally investigatedon bubble dynamics and effect on the flow boiling instabilities and heat transfer in a Multiple Microchannel heat sink. The heat sink used by them containing 40 parallel Rectangular channels, having hydraulic diameter of 194µm and aspect ratio of 0.549 with deionised water as working fluid at 71 o C inlet temperature.…”

Section: Flow Boiling 41 Experimental Studies On Flow Boilingmentioning

confidence: 99%

Review on two-phase flow boiling in oblique fined microchannel heat sink with different channel cross section

2018

IJCTR

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The research era and development on two-phase flow boiling will give a tremendous choice in various application fields. In spite of this progression, there arise disarray forms under the different streams of thecross-section, oblique fins and types of fluid being used. This study deals on various cross-sections such as rectangular, square, triangle and with avariable aspect ratio of themicrochannel. The paper focuses on the behavior of different types of fluid used in amicrochannel with various thermo-physical properties. The formulated growth in the fields of flow boiling from the introductory to the modern changes is enumerated in both the ways of experimental as well as numerical. In addition to that, this paper concerns the bubble growth rate and heat transfer characteristics of flow boiling experiments. Numerical solutions and their correlations with their experimental data are also summarised. The stimulated improvements in various aspects of microchannel era in experimental and theoretical dataare tabulated. Based on the consolidated database a new model approach on two-phase flow boiling has resulted out.

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Bubble dynamics and flow boiling instabilities in microchannels

Cited by 76 publications

References 32 publications

Effect of aspect ratio on saturated boiling flow in microchannels with nonuniform heat flux

Effect of aspect ratio on saturated boiling flow in microchannels with nonuniform heat flux

Investigation of the Temperature Fluctuation of Single-Phase Fluid Based Microchannel Heat Sink

Review on two-phase flow boiling in oblique fined microchannel heat sink with different channel cross section

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