Critical heat flux in a 0.38mm microchannel and actions for suppression of flow boiling instabilities

Tibiriçá, Cristiano; Czelusniak, Luiz Eduardo; Ribatski, Gherhardt

doi:10.1016/j.expthermflusci.2015.02.020

Cited by 47 publications

(6 citation statements)

References 49 publications

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“…In the context described above, two main approaches were considered for the active control of flow instability. The first relies on the feeding pressure/mass flow rate control, for instance, using a micro-valving system placed upstream the inlet section [40][41][42][43], bubble seeding [44,45], or synthetic jet in the crossflow [46] demonstrating the heat transfer coefficient enhancement (see Figure 11). This approach is typically applied in partially vaporized heating systems after performing a predictive analysis of the dynamic response of the thermal system [47].…”

Section: Active Control Of Flow Instabilitymentioning

confidence: 99%

MEMS Vaporazing Liquid Microthruster: A Comprehensive Review

et al. 2021

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The interest in developing efficient nano and pico-satellites has grown in the last 20 years. Secondary propulsion systems capable of serving specific maneuvers are an essential part of these small satellites. In particular, Micro-Electro-Mechanical Systems (MEMS) Vaporizing Liquid Microthrusters (VLM), using water as a propellant, represent today a smart choice in terms of simplicity and cost. In this paper, we first propose a review of the international literature focused on MEMS VLM development, reviewing the different geometries and heating solutions proposed in the literature. Then, we focus on a critical aspect of these micro thrusters: the presence of unstable phenomena. In particular, the boiling instabilities and reverse channel flow substantially impact the MEMS VLMs’ performance and limit their applicability. Finally, we review the research focused on the passive and active control of the boiling instabilities, based on VLM geometry optimization and active heating strategies, respectively. Today, these ones represent the two principal research axes followed by the scientific community to mitigate the drawbacks linked to the use of MEMS VLMs.

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Section: Active Control Of Flow Instabilitymentioning

confidence: 99%

MEMS Vaporazing Liquid Microthruster: A Comprehensive Review

et al. 2021

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“…Furthermore, the dryout region is characterized by intermittent fronts of liquid waves that periodically rewet the channel. According to Tibiriçáet al [11], the frequency of these waves decreases with increasing thermal instability effects, implying on a longer period under which the surface is dry. This behavior is associated to lower local time-averaged heat transfer coefficients and may lead to the surface dryout [12].…”

Section: Introductionmentioning

confidence: 98%

Flow boiling heat transfer of R134a in a 500 µm ID tube

Filho

Aguiar

Ribatski

2020

J Braz. Soc. Mech. Sci. Eng.

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The present paper presents experimental results for the heat transfer coefficient during flow boiling of refrigerant R134a in a circular channel with internal diameter of 500 µm. The experimental database covers mass velocities ranging from 200 to 800 kg/m 2 s, heat fluxes up to 100 kW/m 2 and vapor qualities from 0.02 to 0.75 for a saturation temperature of 40 °C. The experimental data were parametrically analyzed and the effects of the experimental parameters (heat flux, mass velocity and vapor quality) identified. Additionally, images of two-phase flow were obtained through a high-speed camera and employed to identify the flow patterns. A flow pattern map was built and compared to prediction methods from the literature. In general, the heat transfer coefficient increased with increasing mass velocity and heat flux. The experimental data were compared against seven flow boiling predictive methods from the literature.

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“…This indicates that the hydraulic diameter and aspect ratio affect the microchannel flow boiling heat transfer. Due to the complexity of this heat transfer mode, the instability of the microchannel flow boiling heat transfer, the heat transfer mechanism, and pressure drop characteristics still require a lot of research …”

Section: Introductionmentioning

confidence: 99%

“…Due to the complexity of this heat transfer mode, the instability of the microchannel flow boiling heat transfer, the heat transfer mechanism, and pressure drop characteristics still require a lot of research. [14][15][16][17][18] In past studies, most researchers studied the effect of the aspect ratio on microchannel flow boiling by changing the hydraulic diameter, mass flow, heat flux, and so forth, but for most electronic components, the surface heat flux is not uniform, and there is less literature with nonuniform heat flux at the bottom to study the effect of the aspect ratio on microchannel flow boiling. Therefore, in this study, a nonuniform heat flux chip was used as a heat source, and two different hydraulic diameter microchannels were used to study the effect of the aspect ratio on the saturation flow boiling of microchannels.…”

mentioning

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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Critical heat flux in a 0.38mm microchannel and actions for suppression of flow boiling instabilities

Cited by 47 publications

References 49 publications

MEMS Vaporazing Liquid Microthruster: A Comprehensive Review

MEMS Vaporazing Liquid Microthruster: A Comprehensive Review

Flow boiling heat transfer of R134a in a 500 µm ID tube

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

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