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首页> 外文期刊>Journal of Materials Science >Droplet cooling in atomization sprays
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Droplet cooling in atomization sprays

机译：雾化喷雾中的液滴冷却

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Transport between droplets/particles and a gas phase plays an important role in numerous material processing operations. These include rapid solidification operations such as gas atomization and spray forming, as well as chemical systems such as flash furnaces. Chemical reaction rates and solidification are dependent on the rate of gas-particle or gas-droplet transport mechanisms. These gas-based processes are difficult to analyze due to their complexity which include particle and droplet distribution and the flow in a gas field having variations in temperature and velocity both in the jet cross-section and in the axial distance away from the jet source. Thus to study and properly identify the important variables in transport, these gas and droplet variations must be eliminated or controlled. This is done in this work using models based on a single fluid atomization system. Using a heat transport model (referred to as thermal model) validated using single fluid atomization of molten droplets and a microsegregation model, the effect of process variables on heat losses from droplets was examined. In this work, the effect of type of gas, droplet size, gas temperature, gas-droplet relative velocity on the heat transport from AA6061 droplets was examined. It is shown that for a given gas type, the most critical process variable is the gas temperature particularly as affected by two-way thermal coupling and the droplet size. The results are generalized and applied to explain the difference in droplet cooling rate from different atomization processes.
机译：液滴/微粒与气相之间的传输在许多材料处理操作中起着重要作用。这些措施包括快速凝固操作，例如气体雾化和喷涂成型，以及化学系统，例如闪蒸炉。化学反应速率和固化取决于气体颗粒或气体液滴传输机制的速率。这些基于气体的工艺由于其复杂性而难以分析，这些复杂性包括颗粒和液滴的分布以及在射流横截面和远离射流源的轴向距离均具有温度和速度变化的气田中的流动。因此，为了研究并正确识别运输中的重要变量，必须消除或控制这些气体和液滴的变化。在这项工作中，使用基于单个流体雾化系统的模型来完成此操作。使用通过熔融液滴的单流体雾化验证的传热模型（称为热模型）和微偏析模型，研究了工艺变量对液滴热量损失的影响。在这项工作中，研究了气体类型，液滴尺寸，气体温度，液滴相对速度对AA6061液滴传热的影响。结果表明，对于给定的气体类型，最关键的过程变量是气体温度，尤其是受双向热耦合和液滴尺寸影响的温度。将结果概括并用于解释不同雾化过程中液滴冷却速率的差异。

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