课题组指导本科生在国际一流期刊发表闪蒸喷雾学术论文
发布时间：2019-03-13
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- 发布时间：
- 2019-03-13
- 文章标题：
- 课题组指导本科生在国际一流期刊发表闪蒸喷雾学术论文
- 内容：
文章题目：Experimental and theoretical studies on the droplet temperature behavior of R407C two-phase flashing spray
作者：Zhi-Fu Zhou, Meng-Yuan Hu, Hui Xin Bin Che⇑, Guo-Xiang Wang
其中作者之一胡梦圆（Meng-Yuan Hu）为化工学院四年级本科生。
本课题组长期致力于培养具有科研开创精神和实践能力的优秀本科生、研究生。欢迎优秀人才的加盟。
文章简介
本工作对R407C闪蒸喷雾场液滴温度特性开展了实验与理论研究，应用细丝热电偶探针测量了全场的温度分布特性，发展了一种预测液滴温度的理论模型--液滴蒸发耦合模型。相比传统的单相模型，耦合模型能够极大改善对液滴温度预测的准确性。
Abstract:Flashing spray is a common phenomenon in many industrial fields. A rapid droplet temperature changein flashing spray is an important feature, which distinguishes this phenomenon from other traditionalsprays. This study provides first-hand droplet temperature data of an R407C flashing spray, which servesas a substitute for R22, by conducting systematic experiments. A coupled droplet evaporation model isalso introduced to predict the droplet temperature of flashing spray, rather than CFD simulation, forthe first time considering the coupling of heat and mass transfer between a droplet surface and its surroundingregion of influence. Experimental result shows that droplet temperature first decreases rapidlywith axial distance, and then a gradual decrease in the downstream until its minimum value is reached. Ahot core is observed near the nozzle exit, where the droplet temperature is higher at the spray center thanin its periphery region. Droplet radial temperature distribution becomes uniform in the far spray field.The interaction of heat and mass transfer between the droplet surface and its surrounding region of influenceis revealed using a coupled evaporation model. That is, the vapor mass fraction and temperature ofthe influence region undergo increase and decrease with evaporating time, respectively. Therefore, thecoupled evaporation model presents better performance than a one-way evaporation model in predictingdroplet minimum temperature. This predictive result agrees well with the experimental data. The minimumtemperature of a predictive droplet is independent of the initial diameter and velocity of thisdroplet.