Lattice Boltzmann study of pool boiling heat transfer enhancement on structured surfaces

Chang, Xiangting; Huang, Haibo; Cheng, Yongpan; Lu, Xi‐Yun

doi:10.1016/j.ijheatmasstransfer.2019.05.041

Cited by 43 publications

(6 citation statements)

References 40 publications

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“…Over time, the pseudopotential method was applied to more complex problems such as pool boiling or boiling inside channel flows. For these applications, the second form of gravity became widely used [12][13][14][15][16][17]20 .…”

Section: Gravitational Force In the Pseudopotential Methods Literaturementioning

confidence: 99%

“…Some authors use a conventional formulation for this force as F g = ρg [7][8][9][10][11] . Other authors opt for a formulation in the form F g = (ρ − ρ )g, where ρ is the average density of the domain [12][13][14][15][16][17][18][19][20] . If the force of gravity is small enough to lead to only minor differences in the pressure in the simulation, those formulations will give very similar results.…”

Section: Introductionmentioning

confidence: 99%

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Effects of gravity induced pressure variations for thermal liquid-gas phase-change simulations with the pseudopotential lattice Boltzmann method

Czelusniak¹,

Cabezas‐Gómez²,

Wagner³

2023

Preprint

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Direct simulations of phase-change and phase-ordering phenomena are becoming more common. Recently qualitative simulations of boiling phenomena have been undertaken by a large number of research groups. One seldom discussed limitations is that large values of gravitational forcing are required to simulate the detachment and rising of bubbles formed at a bottom surface. The forces are typically so large that neglecting the effects of varying pressure in the system becomes questionable. In this paper we examine the effect of large pressure variations induced by gravity using pseudopotential lattice Boltzmann simulations. These pressure variations lead to height dependent conditions for phase co-existence and nucleation of either gas or liquid domains. Because these effects have not previously been studied in the context of these simulation methods we focus here on the phase-stability in a one dimensional system, rather than the additional complexity of bubble or droplet dynamics. Even in this simple case we find that the different forms of gravitational forces employed in the literature lead to qualitatively different phenomena, leading to the conclusion that the effects of gravity induced pressure variations on phase-change phenomena should be very carefully considered when trying to advance boiling and cavitation as well as liquefaction simulations to become quantitative tools.

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Section: Gravitational Force In the Pseudopotential Methods Literaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of gravity induced pressure variations for thermal liquid-gas phase-change simulations with the pseudopotential lattice Boltzmann method

Czelusniak¹,

Cabezas‐Gómez²,

Wagner³

2023

Preprint

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show abstract

“…In recent years, the lattice Boltzmann method (LBM) has been developed into an effective and powerful computational fluid dynamics technique. It has been widely used in modelling complex multiphase flows including boiling (Chang, Huang & Lu 2017;Chang et al 2019), droplet evaporation and condensation (Ledesma-Aguilar, Vella & Yeomans 2014; Hessling, Xie & Harting 2017) and the moving contact line problem (Kusumaatmaja, Hemingway & Fielding 2016). The multiphase LBM, as a diffuse-interface model, can automatically capture the GLI by incorporating two-phase interactions.…”

Section: Methodsmentioning

confidence: 99%

Width effect on contact angle hysteresis in a patterned heterogeneous microchannel

Chang

Huang

et al. 2022

J. Fluid Mech.

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The width effect on contact angle hysteresis in a microchannel with patterned heterogeneous surfaces is systematically investigated. In the model, identical defects periodically appear on the background surface. To this end, a droplet's evaporation and condensation processes inside the microchannel are studied by theoretical analysis and numerical simulation based on a diffuse-interface lattice Boltzmann method. The microchannel width effect on the system's equilibrium properties is studied. The results demonstrate that the number of equilibrium configurations increases linearly with the microchannel width ( $b$ ), and has a quadratic relationship with the cosine of the reference contact angle and the heterogeneity strength ( $\varepsilon$ ). The average most stable contact angle is independent of $b$ and is always equal to the contact angle predicted by the Cassie–Baxter equation. For contact angle hysteresis ( $H$ ), when the microchannels are narrow and wide, there are individual-effect-dominated hysteresis (IDH) and collective-effect-dominated hysteresis (CDH), respectively. The IDH and CDH are hysteresis modes corresponding to the jumping behaviour of contact lines affected by individual defects and two neighbouring defects, respectively. Based on the graphical force balance approach, we establish a scaling law to quantify the connection between $H$ , $b$ and $\varepsilon$ . Specifically, in the IDH mode, $H\sim b \varepsilon ^2$ , while in the CDH mode, $H$ increases linearly with $\varepsilon$ but nonlinearly with $b$ .

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“…In nucleation boiling, the geometry of nucleation sites due to micro-structure entirely effect on bubble dynamics. Recently, some numerical simulations [3][4][5] and experiments [6][7][8][9][10][11] have been performed to investigate boiling mechanism of artificial nucleation site by lattice Boltzmann method (LBM) [12][13][14][15][16][17][18][19][20][21]. Most of simulations only focus on nucleation sites.…”

Section: Introductionmentioning

confidence: 99%

Studying the effect of geometry of micro-cavity on pool boiling by LBM

Huang

Zhou²,

Huai³

et al. 2023

J. Phys.: Conf. Ser.

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Pool boiling heat transfer from structured surface is simulated numerically with a 3D OTRT (optimal two relaxation time) Lattice Boltzmann method. This work shows in detail that multiple bubbles grow and coalesce over hydrophilic (θ = 50°) surfaces in 3D view, heat flux transfers from heater surface to fluid, and temperature of heater surface varies with time. Specifically, four types of geometry in microstructure surfaces are examined and compared. It is found that heat flux of S5 is the highest and its wall temperature is the lowest. When compared with S0, the heat flux of S5~S7 increased a lot due to the easier formation of vapor blanket, and cubic shaped cavity alleviates largely this deterioration. Next, the large quantity of heat from the three phase contact line in the vicinity of side wall accounts for bubble nucleation and energy from the evaporation of thin liquid between bubbles and superheated wall helps bubbles to grow further. Besides, it is found that S5 increases nucleate site density, reduces boiling incipience superheat, and enhances remarkably heat transfer performance.

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Lattice Boltzmann study of pool boiling heat transfer enhancement on structured surfaces

Cited by 43 publications

References 40 publications

Effects of gravity induced pressure variations for thermal liquid-gas phase-change simulations with the pseudopotential lattice Boltzmann method

Effects of gravity induced pressure variations for thermal liquid-gas phase-change simulations with the pseudopotential lattice Boltzmann method

Width effect on contact angle hysteresis in a patterned heterogeneous microchannel

Studying the effect of geometry of micro-cavity on pool boiling by LBM

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