Modulation of homogeneous and isotropic turbulence in emulsions
Modulation of homogeneous and isotropic turbulence in emulsions
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DOI：
10.1017/jfm.2022.179
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发表时间：
2022-04-08
影响因子：
3.7
通讯作者：
Brandt, Luca
中科院分区：
文献类型：
--
作者：
Crialesi-Esposito, Marco;Rosti, Marco Edoardo;Brandt, Luca
我们提出了一个数值研究的乳液在均匀和各向同性湍流（HIT）在Re λ = 137。该问题是通过直接数值模拟，其中的流体的体积是用来表示的复杂功能的液-液界面。我们考虑了两种等密度流体的混合物，其中流体性质是变化的，目的是理解它们在湍流调制中的作用，特别是体积分数（0.03 <α < 0.5），粘度比（0.01 < mu（d）/mu（c）< 100）和大尺度韦伯数（10.6 < We（L）< 106.5）。通过研究积分量和光谱逐尺度分析进行的分析表明，能量从大尺度到小尺度一致地通过界面传输，并且没有观察到逆级联。此外，总表面被发现是成正比的能量传输的量，而粘度和表面张力改变的动态，调节能量传输。我们还观察到液滴尺寸分布的-10/3和-3/2标度，这表明导致其推导的尺寸参数在HIT条件下得到验证。
We present a numerical study of emulsions in homogeneous and isotropic turbulence (HIT) at Re-lambda = 137. The problem is addressed via direct numerical simulations, where the volume of fluid is used to represent the complex features of the liquid-liquid interface. We consider a mixture of two iso-density fluids, where fluid properties are varied with the goal of understanding their role in turbulence modulation, in particular the volume fraction (0.03 < alpha < 0.5), viscosity ratio (0.01 < mu(d)/mu(c) < 100) and large-scale Weber number (10.6 < We(L) < 106.5). The analysis, performed by studying integral quantities and spectral scale-by-scale analysis, reveals that energy is transported consistently from large to small scales by the interface, and no inverse cascade is observed. Furthermore, the total surface is found to be directly proportional to the amount of energy transported, while viscosity and surface tension alter the dynamic that regulates energy transport. We also observe the -10/3 and -3/2 scaling on droplet size distributions, suggesting that the dimensional arguments that led to their derivation are verified in HIT conditions.