振荡流中的冰融化
Ice melting in an oscillatory flow
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中文总结 AI 辅助
该研究通过二维直接数值模拟，分析无浮力条件下振荡流的振幅和频率对冰圆盘融化动力学的影响，识别出慢振荡的强制对流状态与快振荡的扩散极限状态两种机制，揭示了融水积聚对热传递的抑制作用。
中文摘要 AI 辅助
我们采用二维直接数值模拟，在无浮力条件下，研究受外部振荡流作用的冰圆盘的融化动力学，改变流动振幅和振荡频率。我们识别出由边界层内平流与扩散相互作用主导的两种不同状态：对于慢振荡，融化过程可由有效稳态流很好地描述，适用于经典强制对流的描述；对于快振荡，融化时间显著增加并趋近于扩散极限状态，原因是振荡流无法更新振荡边界层内的流体，导致冷融水在界面附近积聚，降低了热传递效率。
英文摘要
We investigate the melting dynamics of an ice disk subjected to an external oscillatory flow using two-dimensional direct numerical simulations, in the absence of buoyancy, varying the flow amplitude and its oscillation frequency. We identify two distinct regimes governed by the interplay between advection and diffusion within the boundary layer. For slow oscillations, the melting process is well described by an effective steady flow, where a description based on classical forced convection is applicable. For fast oscillations the melting time increases significantly and approaches the diffusion limit regime, as a result of the oscillatory flow being unable to renew the fluid within the oscillating boundary layer, causing cold meltwater to accumulate near the interface and reducing heat transfer.
