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Evaluation of the Performance of the Drag Force Model in Predicting Droplet Evaporation for R134a Single Droplet and Spray Characteristics for R134a Flashing Spray

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  • Zhi-Fu Zhou

    (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Dong-Qing Zhu

    (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Guan-Yu Lu

    (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Bin Chen

    (State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Wei-Tao Wu

    (School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Yu-Bai Li

    (Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA)

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 effect 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 effect on droplet evporation in both single isolated droplet modelling and fully two-phase flashing spray simulation. However, the Khan–Richardson model contributes to different results. In particular, it predicts a much different 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.

Suggested Citation

  • Zhi-Fu Zhou & Dong-Qing Zhu & Guan-Yu Lu & Bin Chen & Wei-Tao Wu & Yu-Bai Li, 2019. "Evaluation of the Performance of the Drag Force Model in Predicting Droplet Evaporation for R134a Single Droplet and Spray Characteristics for R134a Flashing Spray," Energies, MDPI, vol. 12(24), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:24:p:4618-:d:294436
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    References listed on IDEAS

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    1. Cheng, Wen-Long & Zhang, Wei-Wei & Chen, Hua & Hu, Lei, 2016. "Spray cooling and flash evaporation cooling: The current development and application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 55(C), pages 614-628.
    2. Qingpu Li & Leren Tao & Lei Li & Yongpan Hu & Shengli Wu, 2017. "Experimental Investigation of the Condensation Heat Transfer Coefficient of R134a inside Horizontal Smooth and Micro-Fin Tubes," Energies, MDPI, vol. 10(9), pages 1-18, August.
    3. M.H.H. Ishak & Farzad Ismail & Sharzali Che Mat & M.Z. Abdullah & M.S. Abdul Aziz & M.Y. Idroas, 2019. "Numerical Analysis of Nozzle Flow and Spray Characteristics from Different Nozzles Using Diesel and Biofuel Blends," Energies, MDPI, vol. 12(2), pages 1-25, January.
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    Cited by:

    1. Dmitrii V. Antonov & Roman M. Fedorenko & Pavel A. Strizhak, 2022. "Micro-Explosion Phenomenon: Conditions and Benefits," Energies, MDPI, vol. 15(20), pages 1-19, October.

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