Numerical investigations on flow boiling heat transfer of ammonia water binary solution (NH3/H2O) in a horizontal microchannel

Yang, Ren; Wang, Yi; Li, Yongliang

doi:10.1016/j.ijheatmasstransfer.2021.121091

Cited by 8 publications

(5 citation statements)

References 46 publications

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“…Under this condition, the average heat flux of the chip will reach 5000 kW/m 2 , and the local hot spot heat flux will exceed 10 000 kW/m 2 , 3 . Many classical heat dissipation methods have lost their effects under this condition 4,5 . Eighty‐five degrees Celsius is the stable operating temperature threshold of the commonly used electronic chips 6 .…”

Section: Introductionmentioning

confidence: 99%

“…2,3 Many classical heat dissipation methods have lost their effects under this condition. 4,5 Eighty-five degrees Celsius is the stable operating temperature threshold of the commonly used electronic chips. 6 Too high temperature will lead to a dramatic drop in performance and even cause failure of the chip and the bus motherboard connecting the chip.…”

Section: Introductionmentioning

confidence: 99%

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Topology optimization of a novel bionic fractal microchannel applied in thermal management of electronic components

Wang

Sun

et al. 2023

Asia-Pacific J Chem Eng

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Reducing energy consumption and improving device efficiency are important ways to realize efficient heat dissipation of microdevices, this paper developed a new bionic fractal microchannel heat sink based on fractal theory and topological optimization ideas, which introduced a binary flow stagnation zone optimization based on topological optimization ideas on the basic fractal microchannel. The thermal and hydraulic properties of a nanofluid in a fractal microchannel heat sink (FMCHS) have been numerically simulated with the fractal dimensions (fd = 1, 1.5, and 2) and Reynolds number (Re = 200–1600) as variables, and the comprehensive performance has been analyzed. The results showed that the introduction of the optimization increases the central velocity of the microchannel by 7.14–18.2%. With fractal dimensions of 1.5 and 2, the flow improvement and velocity increase are significant, and a significant Nusselt number improvement is obtained. The best comprehensive performance is obtained for FMCHS with a fractal dimension of 1.5, with an optimization effect of 8.3%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Topology optimization of a novel bionic fractal microchannel applied in thermal management of electronic components

Wang

Sun

et al. 2023

Asia-Pacific J Chem Eng

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“…However, the designer of MPTL need to master the flow boiling characteristics of the microchannel heat sink so as to prevent pre-mature Critical Heat Flux (CHF) and flow instabilities [3]. To relieve the problems of two phase flow and heat transfer in the microchannels mentioned above, some recent studies have been centered on developing Computational Fluid Dynamics (CFD) approach for prediction of two phase flow pattern, void fraction, pressure drop, heat transfer coefficient and CHF [4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the MM was the best model to predict the void fraction compared to the other two models. Yang et al [5] used the VOF model and the modified Lee model [6] to study the two phase flow and heat transfer characteristics for NH 3 /H 2 O mixture in a horizontal two-dimensional single microchannel. The results indicated that at some cases, it was benefit to used NH 3 /H 2 O mixture as an alternative coolant to prevent local drying of electronic components and maintain the temperature within their limits.…”

Section: Introductionmentioning

confidence: 99%

3D numerical investigation on flow boiling characteristics in large length-to-diameter ratio microchannel

Huang,

Chen,

Peng

et al. 2023

J. Phys.: Conf. Ser.

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To meet the demand of thermal management with large power and high heat flux in the future engineering applications, more and more attentions have been draw to develop the two-phase microchannel cooling technology. In this work, a three dimensional numerical investigation is performed to study the influence of mass flux and heat flux on the two phase flow boiling characteristics in a single microchannel with large length-to-diameter ratio. The related calculation results show that the Volume of Fluid (VOF) model coupled with Lee model can predict the two phase pressure drop and heat transfer coefficient of the microchannel well. And the flow patterns in the microchannel are classified as bubbly flow, slug flow and annular flow, which can be captured by this numerical model precisely. Besides, the transient pressure drop augments with the increase of mass flux. But the effect of mass flux on the amplitude of quasi-steady pressure drop and the peak value of time-averaged heat transfer coefficient along the microchannel is small. At last, the amplitude of quasi-steady pressure drop increases with the augmentation of heat flux. The maximum and fully developed time-averaged heat transfer coefficients along the microchannel increase with the heat flux.

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“…Sitar and Golobic [7] found that the use of water-butanol mixtures can postpone the occurrence of dry-out. The study of Yang et al [8] on the flow boiling of NH 3 water mixtures revealed that the improvement of the heat transfer coefficient was caused by the presence of nucleation due to the lower boiling point of the mixtures compared to the pure liquid. These findings show the potential of the application of binary mixtures in the boiling application, and further studies that cover various operating conditions should be conducted.…”

Section: Introductionmentioning

confidence: 99%

Flow Fluctuation during Flow Boiling of Binary Mixtures in High Aspect Ratio Microchannel

Widyatama,

Venter,

Mohamad

et al. 2023

J. Phys.: Conf. Ser.

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Flow boiling performance is affected by several factors, such as channel characteristics and working fluid types. It is found that there is still limited study that discusses the use of binary mixtures combined with high aspect ratio microchannels. The aim of this study is to investigate the flow fluctuation during flow boiling of binary mixtures in rectangular microchannels. Here, a 6 mm width and 0.3 mm depth rectangular channel was utilised, and it represents a hydraulic diameter of 571 μm and an aspect ratio of 20. In the present works, a mass flux of 10 kg m-2 s-1 was used, and the heat flux ranged from 15.2 and 21.0 kW m-2. The image processing technique was applied to track the bubble tail movement. In addition, the thermal camera was utilised to gather the wall temperature distribution of the channel. The preliminary results show that the use of binary mixtures influences the vapour fraction in the channel and the flow fluctuation characteristics. Some differences are observed in terms of wall temperature characteristics. However, the rapid increase of wall temperature is found in the outlet region for high flux cases under all liquid types which suggests the dominance of dry out event.

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Numerical investigations on flow boiling heat transfer of ammonia water binary solution (NH3/H2O) in a horizontal microchannel

Cited by 8 publications

References 46 publications

Topology optimization of a novel bionic fractal microchannel applied in thermal management of electronic components

Topology optimization of a novel bionic fractal microchannel applied in thermal management of electronic components

3D numerical investigation on flow boiling characteristics in large length-to-diameter ratio microchannel

Flow Fluctuation during Flow Boiling of Binary Mixtures in High Aspect Ratio Microchannel

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