Abstract

The effect of evaporation of several types of liquid (water, ethanol, acetone, and glycerol) on the turbulence dynamics, propagation of the dispersed phase, and heat transfer in a backward-facing step for the droplet diameter \(d_{1}\) = 1–100 \(\mu\)m and mass fraction \(M_{L1}\) = 0–0.1 was studied numerically. The two-fluid two-temperature Euler model was used for calculation of the motion and heat transfer in the droplet-laden flow. The system of Reynolds-averaged Navier–Stokes equations (RANS) written down with consideration of the presence and evaporation of droplets of different liquids was used in the work. The turbulent kinetic energy of the carrier gas phase was described using the model of transfer of the Reynolds stress model with consideration of the two phases of the flow. The effect of suppression of the turbulence of the carrier gas phase is minimal for acetone droplets (more than 7%) and maximal for glycerol and water droplets (up to 15%). The heat transfer enhancement at the use of ethanol droplets is maximal (more than two times compared with the single-phase separated flow), and evaporation of acetone droplets led to minimum heat transfer intensification (up to 25%).

中文翻译：

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液滴蒸发对背向台阶后载液流中湍流和传热影响的数值模拟

摘要

几种液体（水、乙醇、丙酮和甘油）蒸发对液滴直径\(d_{1}\)的湍流动力学、分散相传播和传热的影响 ) = 1–100  \(\mu\) m 和质量分数 \(M_{L1}\)= 0–0.1 进行了数值研究。双流体双温度欧拉模型用于计算液滴流动中的运动和传热。在工作中使用了考虑到不同液体液滴的存在和蒸发而写下的雷诺平均 Navier-Stokes 方程组 (RANS)。使用雷诺应力模型的传递模型描述了载气相的湍流动能，并考虑了流动的两个相。抑制载气相湍流的效果对于丙酮液滴（超过 7%）最小，对于甘油和水滴（高达 15%）最大。使用乙醇液滴时的传热增强是最大的（与单相分离流相比超过两倍），