Numerical simulation of flow boiling from an artificial cavity in a microchannel

Jafari, Rahim; Okutucu-Özyurt, Tuba

doi:10.1016/j.ijheatmasstransfer.2016.02.028

Cited by 48 publications

(21 citation statements)

References 24 publications

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“…Although the length of the microchannels is some millimeters in the previous studies with phase-field method [10,11] and ALE method [12], the computational time of the proposed method is about one third of the phase-field method and half of the ALE method.…”

Section: Validation Of the Numerical Modelmentioning

confidence: 95%

“…Common methods in the literature are based on the tracking of the interface between the liquid and vapor phases. Level-set method [8,9], Volume of Fluid [10], phase-field method [11,12] and Arbitrary Lagrangian-Eulerian (ALE) method [13] are techniques which track the interface of two separated phases of vapor and liquid. In Lattice-Boltzmann method, phase separation occurs automatically and it is not necessary to track the interface [14].…”

Section: Introductionmentioning

confidence: 99%

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Dimensional optimization of two-phase flow boiling in microchannel heat sinks

Jafari

2021

International Advanced Researches and Engineering Journal

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The heat transfer coefficient (HTC) of microchannel heat sinks (MHS) is higher than common heat sinks due to higher area to volume ratio. Its value for two-phase flow boiling is much superior to single-phase flow. In addition, the two-phase flow boiling provides uniform wall temperature close to the coolant’s saturation temperature in low vapor qualities. In the present study, a heat sink is optimized dimensionally after modeling of the boiling of R134a refrigerant in the microchannels. Firstly, mixture two-phase method along with the wall heat flux partitioning are utilized to introduce an applied thermal model to design MHSs. The heat sink mounted on the backside of an Intel core i7-900 desktop processor with dimensions of 19 mm×14.4 mm× 1 mm is numerically simulated to investigate the thermal performance. The HTC and the exit vapor quality are comparable with the available empirical correlations and first law of thermodynamics, respectively. Then the proposed model is developed to optimize the dimensions of the microchannels to design the heat sink with minimized wall temperature. Bound optimization by quadratic approximation (BOBYQA) method results in the optimized dimensions of the microchannels in the heat sink. Optimization of heat sink’s geometry in terms of the dimensions of the microchannels at various boundary conditions will be practical as the unique application of the model.

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Section: Validation Of the Numerical Modelmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Dimensional optimization of two-phase flow boiling in microchannel heat sinks

Jafari

2021

International Advanced Researches and Engineering Journal

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“…However, there is not enough research on the elongated bubbles in the flow boiling in the microchannel. In the studies of Mukherjee and Kandlikar (2005), Lee and Son (2008), Ling et al (2015), Jafari and Okutucu-Özyurt (2016) and Katiyar et al (2016), there is no elongated bubble zone mentioned by Thome (2004) in the microchannel due to the low Reynolds number. It can be seen that there is a certain condition for the appearance of the elongated bubble zone.…”

Section: Introductionmentioning

confidence: 92%

Numerical Investigation on Single Bubble and Multiple Bubbles Growth and Heat Transfer During Flow Boiling in A Microchannel Using the VOSET Method

Guo

Feng

et al. 2019

Microgravity Sci. Technol.

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With the rapid development of modern space technologies, heat sinks with high heat flux have become a bottleneck in the development of high capacity electronic equipment with high power densities. To ensure the stability and security of heat sink devices, it's crucial to greatly enhance the heat transfer performance of the heat sink device and flow boiling in microchannels has attracted more and more attention due to its unique advantages. The objective of this investigation is to study the growth and heat transfer of single bubble and multiple bubbles during flow boiling in a microchannel using the VOSET method. In order to verify the accuracy of the numerical model adopted in this paper, the results obtained by the present method were compared with that of previous experiments and numerical calculations. After that, effects of Re and wall superheat on the bubble morphologies and heat transfer in a microchannel were studied. Increasing Reynolds number could increase the bubble growth rate and boiling flow heat transfer. However, there was a slight increase in heat transfer performance with an increase in wall superheat. In addition, when Re reached a certain value, the elongated bubble zone would appear in the microchannel. Further, the stretching length, the contact length between the heated wall and the vapour and the second kind of thin liquid layer were analyzed in detail. Finally, more importantly, the dynamics and heat transfer of multiple bubbles with different bubble waiting time were presented. With a decrease in bubble waiting time, the heat transfer performance was enhanced significantly.

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“…Jafari and Okutucu-Ozyurt [29] simulated flow boiling process in a microchannel considering an artificial cavity at the channel wall using Cahn -Hilliard method. The bubble is nucleated from the artificial cavity and it grows up till it reaches the channel height and then departs from the nucleation site.…”

Section: Prediction Of Heat Transfer Coefficientmentioning

confidence: 99%

Modeling of pressure drop and heat transfer for flow boiling in a mini/micro-channel of rectangular cross-section

Jain

Jayaramu

Gedupudi

2019

International Journal of Heat and Mass Transfer

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In the present study, a 1-dimensional model is proposed to estimate the pressure drop and heat transfer coefficient for flow boiling in a rectangular microchannel. The present work takes into account the pressure fluctuations caused due to the confined bubble growth and the effect of pressure fluctuations on the heat transfer characteristics. The heat transfer model considers five zones, namely, liquid slug, partially confined bubble, fully confined (elongated) bubble, partial dryout and full dry-out. The model incorporates the thinning of liquid film due to shear stress at liquid-vapour interface in addition to evaporation. The transient fluctuations in pressure and heat transfer coefficient, along with the time-averaged ones, are verified with the experimental data available in the literature. Heat transfer characteristics with flow reversal caused by inlet compressibility are also presented.

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Numerical simulation of flow boiling from an artificial cavity in a microchannel

Cited by 48 publications

References 24 publications

Dimensional optimization of two-phase flow boiling in microchannel heat sinks

Dimensional optimization of two-phase flow boiling in microchannel heat sinks

Numerical Investigation on Single Bubble and Multiple Bubbles Growth and Heat Transfer During Flow Boiling in A Microchannel Using the VOSET Method

Modeling of pressure drop and heat transfer for flow boiling in a mini/micro-channel of rectangular cross-section

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