Direct simulation of flow-boiling crisis and its porous-metasurface control for very large dryout limit
International Journal of Heat and Mass Transfer（2022）
摘要
•DNS of saturated-water flow boiling, based on the Zuber hexagonal unit cell with circular vapor site, is used to predict the dryout of the leading-edge surface liquid track.•A CHF-flow velocity relation in the wavelength-modulation regime is suggested.•To further increase the CHF, the rectangular vapor sites are leveed to prevent shear instability of the liquid track, establishing geometric-confined modulation regime.•The FBCW has an internal hydrodynamic resistance (capillary-viscous limit) which is smaller than the geometric-confined modulation CHF.
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关键词
Flow boiling critical heat flux,Porous metasurface,Zuber pool boiling CHF unit cell,Critical wavelength,Wavelength modulation,Hydrodynamic instability,Kelvin-Helmholtz instability,Rayleigh-Taylor instability,Capillary-viscous limit,Superheat limit,Direct numerical simulation of flow boiling,Large eddy simulation of two-phase flow
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