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- W2976085655 abstract "We report the first comparative study of the phase-change Rayleigh–Bénard (RB) convection system and the classical RB convection system to systematically characterize the effect of the oscillating solid-liquid interface on the RB convection. Here, the role of Stefan number Ste (defined as the ratio between the sensible heat to the latent heat) and the Rayleigh number based on the averaged liquid height R a f is systematically explored with direct numerical simulations for low Prandtl number fluid (Pr = 0.0216) in a phase-change RB convection system during the stationary state. The control parameters R a f (3.96 × 10 4 ≤ R a f ≤ 9.26 × 10 7 ) and Ste (1.1 × 10 −2 ≤ Ste ≤ 1.1 × 10 2 ) are varied over a wide range to understand its influence on the heat transport and flow features. Here, we report the comparison of large-scale motions and temperature fields, frequency power spectra for vertical velocity, and a scaling law for the time-averaged Nusselt number at the hot plate [Formula: see text] vs R a f for both the RB systems. The intensity of solid-liquid interface oscillations and the standard deviation of Nu h increase with the increase in Ste and R a f . There are two distinct RB flow configurations at low R a f independent of Ste. At low and moderate R a f , the ratio of the Nusselt number for phase-change RB convection to the Nusselt number for classical RB convection [Formula: see text] is always greater than one. However, at higher R a f , the RB convection is turbulent, and [Formula: see text] can be less than or greater than one depending on the value of Ste. The results may turn out to be of immense consequence for understanding and altering the transport characteristics in the phase-change RB convection systems." @default.
- W2976085655 created "2019-10-03" @default.
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- W2976085655 date "2019-09-01" @default.
- W2976085655 modified "2023-09-25" @default.
- W2976085655 title "Comparison of the quasi-steady-state heat transport in phase-change and classical Rayleigh-Bénard convection for a wide range of Stefan number and Rayleigh number" @default.
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- W2976085655 doi "https://doi.org/10.1063/1.5110295" @default.
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