Steady State Vapor Bubble in Pool Boiling

Zou, An; Chanana, Ashish; Agrawal, Amit; Wayner, Peter; Maroo, Shalabh C.

doi:10.1038/srep20240

Cited by 41 publications

(37 citation statements)

References 36 publications

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“…For one particular case of these jet flows termed the "bubble bunch jet flow", it was speculated to consist of a stream of vapour bubbles [3] (page 66). Interestingly, this observation was made close to the critical heat flux that may relate to the loss of the liquid microlayer [19] which resulted into a pinning of the three phase contact line.…”

Section: Fig 3 A) Solution Of the Kicked Bubble Oscillator Model (Smentioning

confidence: 99%

Oscillate boiling from microheaters

Gonzalez-Avila

Nguyen

et al. 2017

Phys. Rev. Fluids

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We report about an intriguing boiling regime occurring for small heaters embedded on the boundary in subcooled water. The microheater is realized by focusing a continuous wave laser beam to about 10 µm in diameter onto a 165 nm-thick layer of gold, which is submerged in water. After an initial vaporous explosion a single bubble oscillates continuously and repeatably at several 100 kHz. The microbubble's oscillations are accompanied with bubble pinch-off leading to a stream of gaseous bubbles into the subcooled water. The self-driven bubble oscillation is explained with a thermally kicked oscillator caused by the non-spherical collapses and by surface pinning. Additionally, Marangoni stresses induce a recirculating streaming flow which transports cold liquid towards the microheater reducing diffusion of heat along the substrate and therefore stabilizing the phenomenon to many million cycles. We speculate that this oscillate boiling regime may allow to overcome the heat transfer thresholds observed during the nucleate boiling crisis and offers a new pathway for heat transfer under microgravity conditions.Introduction.-The thermal energy transfer from a heater into a liquid is greatly increased once the boiling temperature is reached and vapor bubbles are formed. Then the previous convective driven flow becomes advected by the growing and detaching bubbles rising into the bulk under the action of gravity. By increasing the temperature of the heater further more bubbles are nucleated until a continuous vapor layer is formed [1]. In this so-called film boiling regime heat transfer is strongly reduced; this regime limits the design and efficiency of common heaters. To overcome this boiling crisis, research is focused on the enhancement of heat transfer while avoiding the transition to film boiling. Current promising approaches are the texturing of the heater surface [2] or the use of thin electrically heated wires [3]. Here we report a nucleate boiling regime on a flat substrate where the vapor bubble does not detach from the surface yet transports heat through a flow caused by bubble oscillations and thermocapillary stresses. This letter starts with a description of this unexpected oscillate boiling regime and relates the phenomenon with reports from literature having some similarity before we provide two simple models. The first model, based on a set of ordinary differential equations (ODEs), explains the orgin of the bubble oscillation and the dependency of the oscillation frequency on the heater power. The second model describes the thermal gradients and the resulting thermocapillary flow using a Navier Stokes solver which is compared to the experimental measurements. This novel oscillate boiling regime may allow to overcome the film boiling regime through an auto-oscillatory flow from a constant heat input.

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Section: Fig 3 A) Solution Of the Kicked Bubble Oscillator Model (Smentioning

confidence: 99%

Oscillate boiling from microheaters

Gonzalez-Avila

Nguyen

et al. 2017

Phys. Rev. Fluids

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“…Pool boiling study is of fundamental importance in understanding liquid-vapor phase change physics12345 and enabling many important applications67. In pool boiling heat transfer study, two benchmarks are used to evaluate liquid-vapor phase change heat transfer performance: Critical Heat Flux (CHF) and Heat Transfer Coefficient (HTC)8.…”

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confidence: 99%

Independent and collective roles of surface structures at different length scales on pool boiling heat transfer

Rioux

2016

Sci Rep

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Spherical Cu nanocavity surfaces are synthesized to examine the individual role of contact angles in connecting lateral Rayleigh-Taylor wavelength to vertical Kevin-Helmholtz wavelength on hydrodynamic instability for the onset of pool boiling Critical Heat Flux (CHF). Solid and porous Cu pillar surfaces are sintered to investigate the individual role of pillar structure pitch at millimeter scale, named as module wavelength, on hydrodynamic instability at CHF. Last, spherical Cu nanocavities are coated on the porous Cu pillars to create a multiscale Cu structure, which is studied to examine the collective role and relative significance of contact angles and module wavelength on hydrodynamic instability at CHF, and the results indicate that module wavelength plays the dominant role on hydrodynamic instability at CHF when the height of surface structures is equal or above ¼ Kelvin-Helmholtz wavelength. Pool boiling Heat Transfer Coefficient (HTC) enhancements on spherical Cu nanocavity surfaces, solid and porous Cu pillar surfaces, and the integrated multiscale structure have been investigated, too. The experimental results reveal that the nanostructures and porous pillar structures can be combined together to achieve even higher enhancement of HTC than that of individual structures.

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“…It is this fact combined with their efficiently in removing heat 17 that makes them attractive for a propulsion mechanism. We hereby propose and demonstrate micro-particle propulsion with a light generated bubble.…”

Section: Introductionmentioning

confidence: 99%

Light generated bubble for microparticle propulsion

Frenkel

Niv

2017

Sci Rep

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Light activated motion of micron-sized particles with effective forces in the range of micro-Newtons is hereby proposed and demonstrated. Our investigation shows that this exceptional amount of force results from accumulation of light-generated heat by a micron-sized particle that translates into motion due to a phase transition in the nearby water. High-speed imagery indicates the role of bubble expansion and later collapse in this event. Comparing observations with known models reveals a dynamic behavior controlled by polytropic trapped vapor and the inertia of the surrounding liquid. The potential of the proposed approach is demonstrated by realization of disordered optical media with binary light-activated switching from opacity to high transparency.

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Steady State Vapor Bubble in Pool Boiling

Cited by 41 publications

References 36 publications

Oscillate boiling from microheaters

Oscillate boiling from microheaters

Independent and collective roles of surface structures at different length scales on pool boiling heat transfer

Light generated bubble for microparticle propulsion

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