A critical review on measures to suppress flow boiling instabilities in microchannels

Mao, Ning; Zhuang, Jiaojiao; He, Tianbiao; Song, Mengjie

doi:10.1007/s00231-020-03009-2

Cited by 38 publications

(11 citation statements)

References 113 publications

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“…Bubble condensation is an essential phenomenon for the description of heat and mass transfer in subcooled boiling. It is encountered in many industrial applications, such as microreactors or microchannels, where the bubble dynamics influence the cooling capacity and introduce instabilities to a robust operating condition [1,2]. The size and the shape of vapor bubbles change continuously during the condensation process, and this phenomenon significantly affects the flow structure.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Single Vapor Bubble Condensation with Sharp Interface Mass Transfer Model

Samkhaniani

Stroh

2022

Thermo

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Pure numerical simulation of phase-change phenomena such as boiling and condensation is challenging, as there is no universal model to calculate the transferred mass in all configurations. Among the existing models, the sharp interface model (Fourier model) seems to be a promising solution. In this study, we investigate the limitation of this model via a comparison of the numerical results with the analytical solution and experimental data. Our study confirms the great importance of the initial thermal boundary layer prescription for a simulation of single bubble condensation. Additionally, we derive a semi-analytical correlation based on energy conservation to estimate the condensing bubble lifetime. This correlation declares that the initial diameter, subcooled temperature, and vapor thermophysical properties determine how long a bubble lasts. The simulations are carried out within the OpenFOAM framework using the VoF method to capture the interface between phases. Our investigation demonstrates that calculation of the curvature of interface with the Contour-Based Reconstruction (CBR) method can suppress the parasitic current up to one order.

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Section: Introductionmentioning

confidence: 99%

Simulation of Single Vapor Bubble Condensation with Sharp Interface Mass Transfer Model

Samkhaniani

Stroh

2022

Thermo

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“…The surface micro/nanostructure can be used in the micro-channel to increase the nucleate site density, promote the nucleation of bubbles at low wall superheat, and restrain boiling delay, thus not only eliminating the two-phase instability but also enhancing boiling heat transfer [22][23][24]. Some scholars have put forward methods for active suppression of micro-channel flow boiling instability, such as increasing the inlet liquid pressure to prevent backflow [25], using a subcooled liquid jet to prevent bubbles from growing [26,27], etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Heat Transfer Performance of Pump-Assisted Capillary Phase-Change Loop

et al. 2021

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To overcome the two-phase flow instability of traditional boiling heat dissipation technologies, a porous wick was used for liquid-vapor isolation, achieving efficient and stable boiling heat dissipation. A pump-assisted capillary phase-change loop with methanol as the working medium was established to study the effect of liquid-vapor pressure difference and heating power on its start-up and steady-state characteristics. The results indicated that the evaporator undergoes four heat transfer modes, including flooded, partially flooded, thin-film evaporation, and overheating. The thin-film evaporation mode was the most efficient with the shortest start-up period. In addition, heat transfer modes were determined by the liquid-vapor pressure difference and power. The heat transfer coefficient significantly improved and the thermal resistance was reduced by increasing liquid-vapor pressure as long as it did not exceed 8 kPa. However, when the liquid-vapor pressure exceeded 8 kPa, its influence on the heat transfer coefficient weakened. In addition, a two-dimensional heat transfer mode distribution diagram concerning both liquid-vapor pressure difference and power was drawn after a large number of experiments. During an engineering application, the liquid-vapor pressure difference can be controlled to maintain efficient thin-film evaporation in order to achieve the optimum heat dissipation effect.

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“…However, future demand for increased LDB power will eventually call for highperformance cooling systems in high-powered electronics systems. As an alternative cooling system to single-phase water cooling, two-phase flow in a microchannel (MC) has been widely investigated because of its high heat transfer coefficient (HTC) (Thome, 2004;Cheng and Xia, 2017;Karayiannis, 2017;Sandler et, 2018;Al-Zaidi et al, 2019;Mao et al, 2021). Thome (2004), Sandler (2017), and Karayiannis and Mahmoud (2017) reviewed the experiments and theories on flow boiling heat transfer in MCs.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on heat transfer enhancement in subcooled flow boiling under pressurized conditions

Shiono

Kano

2021

JTST

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In this study, the cooling capabilities of flow boiling heat transfer aided by electrohydrodynamic (EHD) force and diamond-electrodeposited boiling surface is investigated in a micro-slit channel (MSC). The MSC uses a two-phase flow cooling system, in which an electric field is applied to a dielectric liquid using a slit electrode. To reduce the wall temperature below 60 °C and promote cooling in electronic devices, a dielectric liquid with a saturation temperature of 15 °C HCFO-1224yd (AGC, AMOLEA, CF 3 CF = CHCI) was selected as a working fluid. Moreover, the entire system was pressurized using nitrogen gas to suppress liquid flow instabilities due to the generation of cavitation at the saturated system pressure. To enhance boiling heat transfer, the surface was electrically deposited with fine diamond particles (mixture of particles with diameters 20 and 1.5 m), and an electric field of −5 kV/mm was applied between the surface and slit electrode. The experiments were conducted under various system pressures (75-230 kPa), mass flow rates (1.67-5.00 g/s), and degrees of subcooling (5-15 K) to evaluate the heat transfer performance. The electric field was effective in increasing both the critical heat flux (CHF) and heat transfer coefficient (HTC). The high electric field enhanced the boiling heat transfer until the inflow liquid entirely evaporated. Increasing the mass flow rate was also effective in increasing the CHF and HTC at lower wall temperatures, resulting in a maximum of 101 W/cm 2 at 64 °C and 37 kW/m 2 •K at 52 °C, respectively. Increasing the system pressure improved the HTC but elevated the wall temperature. Subcooling was effective in increasing HTC. Increase in either pressure or subcooling did not change the CHF because the entire inflow liquid evaporated in the MSC chamber due to the electric field effect.

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A critical review on measures to suppress flow boiling instabilities in microchannels

Cited by 38 publications

References 113 publications

Simulation of Single Vapor Bubble Condensation with Sharp Interface Mass Transfer Model

Simulation of Single Vapor Bubble Condensation with Sharp Interface Mass Transfer Model

Experimental Study on the Heat Transfer Performance of Pump-Assisted Capillary Phase-Change Loop

Experimental study on heat transfer enhancement in subcooled flow boiling under pressurized conditions

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