Simulations of microlayer formation in nucleate boiling

Guion, Alexandre; Afkhami, Shahriar; Zaleski, Stéphane; Buongiorno, Jacopo

doi:10.1016/j.ijheatmasstransfer.2018.06.041

Cited by 51 publications

(54 citation statements)

References 56 publications

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“…Hänsch and Walker (2016) studied the hydrodynamics of microlayer formation using detailed interface-tracking computations. The work of Guion et al (2018) focused on the hydrodynamic microlayer formation during the very early inertial bubble growth regime. A recent work of Urbano et al (2018) presents CFD computations of the microlayer formation and evaporation, solving for the temperatures in the fluid region but without incorporating conjugate heat transfer into the solid (Hänsch et al, 2015).…”

Section: 'Physically-based' Predictionsmentioning

confidence: 99%

Microlayer formation and depletion beneath growing steam bubbles

Hänsch

Walker

2019

International Journal of Multiphase Flow

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Microlayers, the few-microns-thick layers of liquid that sometimes remain beneath bubbles growing on a heated substrate, are widely observed in experiments, but theoretical understanding of their formation, behaviour and role in bubble growth is limited. In this paper we present detailed interface-tracking simulations of the formation and depletion of such microlayers. Validation of our results is presented to the degree that available measurements of such a rapid and microscopic phenomenon allow. The work extends previous mechanistic hydrodynamic-only CFD simulations of early microlayer formation up to typical bubble departure times. These calculations confirm the understanding that the bubble growth rate and the resulting bubble shape determine the presence and overall extent of microlayers underneath steam bubbles. Their thickness is strongly influenced by viscous effects and surface tension. We then present coupled, physically self-consistent CFD simulations of the formation and evaporative depletion of such microlayers. This modelling suggests strongly that the evaporation process itself constitutes a significant fraction of the small resistance to heat and mass transfer presented by the very thin liquid layer. Inclusion of representations of evaporative thermal resistance, consistent with those suggested in the literature, is seen to promote the prediction of microlayer formation. Identification of the classes of conditions under which microlayers seem likely to be formed is presented, along with an assessment of their relative contributions to bubble growth. Comparisons of the predictions with recent detailed microlayer measurements indicate good agreement.

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Section: 'Physically-based' Predictionsmentioning

confidence: 99%

Microlayer formation and depletion beneath growing steam bubbles

Hänsch

Walker

2019

International Journal of Multiphase Flow

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“…The dry patch is sometimes assumed to be covered by an adsorbed film of molecular thickness, presenting no resistance to heat transfer (Schweikert, Sielaff & Stephan 2019). Recent numerical evidence (Hänsch & Walker 2016;Guion et al 2018;Urbano et al 2018) suggests that the microlayer profile is not of monotonic shape, but rather features a thickened region, or 'hump', immediately adjacent to the microregion (see inset to figure 1). Such a profile, i.e.…”

Section: Introductionmentioning

confidence: 99%

On the modelling of the transition between contact-line and microlayer evaporation regimes in nucleate boiling

Bureš

Sato

2021

J. Fluid Mech.

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“…This correlation has been derived for the case of water in conditions similar to the test cases presented in the current paper. It is understood that other fluids in different conditions of temperature and pressure might exhibit radically different microlayer behavior [36]. The implications on boiling heat transfer might be far reaching, however they are not relevant for the present study, which, as the ref.…”

Section: Figure 17mentioning

confidence: 81%