Computational simulations of spray flows typically start with bulk liquid flow, bulk-to-droplet conversion algorithm for primary atomization, then tracking of discrete particle motion. The key step is the atomization criterion and subsequent drop size conversion. To facilitate this process, we consider the Weber number, based on strain rate (We_st), as the local atomization condition in computational simulations of spray flows. This atomization criterion is tested within the computational protocol developed in this laboratory, which uses the integral theory as the primary atomization algorithm. Based on this definition, We_st ~ 10⁷ appears to work quite well in specifying the location of primary atomization, across different spray geometries. Therefore, the conservation equations of mass and energy in integral forms can be effectively coupled with the CFD-based momentum solver to simulate spray flows, by using the current atomization criterion.

中文翻译：

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应变率韦伯数作为喷雾流模拟计算协议中的局部雾化条件

喷雾流的计算模拟通常从散装液体流动、用于初级雾化的散装到液滴转换算法开始，然后跟踪离散颗粒运动。关键步骤是雾化标准和随后的液滴尺寸转换。为了促进这一过程，我们将基于应变率 (We _st ) 的韦伯数视为喷雾流计算模拟中的局部雾化条件。该原子化标准在本实验室开发的计算协议中进行了测试，该协议使用积分理论作为主要原子化算法。根据这个定义，We _st ~ 10 ⁷似乎在指定不同喷雾几何形状的初级雾化位置方面效果很好。因此，积分形式的质量和能量守恒方程可以与基于CFD的动量求解器有效耦合，利用当前的雾化准则来模拟喷雾流动。