Evaluation of the Performance of the Drag Force Model in Predicting Droplet Evaporation for R134a Single Droplet and Spray Characteristics for R134a Flashing Spray
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Evaluation of the Performance of the Drag Force Model in Predicting Droplet Evaporation for R134a Single Droplet and Spray Characteristics for R134a Flashing Spray
- 发表刊物：
- Energies
- 摘要：
- 本文给予单液滴蒸发理论模型和闪蒸喷雾数值模拟，应用自编程序和Openfoam，主要研究了阻力模型对单液滴蒸发、闪蒸喷雾和液滴群行为的影响机理和规律。
Abstract
Drag force plays an important role in determining the momentum, heat and mass transfer
of droplets in a flashing spray. This paper conducts a comparative study to examine the performance
of drag force models in predicting the evolution of droplet evaporation for R134a single droplet
and spray characteristics for its flashing spray. The study starts from single moving R134a droplet
vaporizing in atomispheric environment, to a fully turbulent, flashing spray caused by an accidental
release of high-pressure R134a liquid in the form of a straight-tube nozzle, using in-house developed
code and a modified sprayFoam solver in OpenFOAM, respectively. The e ect of the nozzle diameter
on the spray characteristics of R134a two-phase flashing spray is also examined. The results indicate
that most of the drag force models have little e ect on droplet evporation in both single isolated
droplet modelling and fully two-phase flashing spray simulation. However, the Khan–Richardson
model contributes to di erent results. In particular, it predicts a much di erent profile of the droplet
diameter distribution and a much lower droplet temperature in the radial distance. The nozzle
diameter has a significant impact on the flashing spray. A smaller diameter nozzle leads to more
internse explosive atomization, shorter penetration distance, lower droplet diameter and velocity,
and a faster temperature decrease.
- 合写作者：
- Zhi-Fu Zhou 1, Dong-Qing Zhu, Guan-Yu Lu , Bin Chen,*, Wei-Tao Wu and Yu-
- 卷号：
- 12
- 页面范围：
- 4618
- 是否译文：
- 否
- 发表时间：
- 2019-12-05