The goal of this work is to determine how different parameters affect the dynamic Leidenfrost temperature of droplets impacting on superheated cylindrical surface through experimental investigation. The parameters affecting the dynamic Leidenfrost temperature of impacting droplet such as Weber number, surface temperature and curvature diameter, film thickness, droplet spreading and contact time are examined. Greater vapour film thickness generated by concave surfaces facilitates early rebound, lowering the dynamic Leidenfrost temperature and raising critical weber number of droplet breakup. In convex surfaces, the gravity component resulting from curvature promotes droplet spreading after impact, but in concave surfaces, it restricts. Due to significant spreading, the vapour layer thickness is lower on convex surfaces than on concave surfaces, resulting in a greater dynamic Leidenfrost temperature. When comparing concave and convex surfaces with the same curvature diameter, Weber number and temperature, there is a noticeable decrease in contact time. Furthermore, it was discovered that for both convex and concave surfaces, the contact time increased with curvature diameter.

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Experimental Investigations on Parameters Affecting the Dynamic Leidenfrost Temperature of Impacting Droplet

  • B. S. Renjith,
  • K. Niju Mohammed,
  • Ranjith S. Kumar

摘要

The goal of this work is to determine how different parameters affect the dynamic Leidenfrost temperature of droplets impacting on superheated cylindrical surface through experimental investigation. The parameters affecting the dynamic Leidenfrost temperature of impacting droplet such as Weber number, surface temperature and curvature diameter, film thickness, droplet spreading and contact time are examined. Greater vapour film thickness generated by concave surfaces facilitates early rebound, lowering the dynamic Leidenfrost temperature and raising critical weber number of droplet breakup. In convex surfaces, the gravity component resulting from curvature promotes droplet spreading after impact, but in concave surfaces, it restricts. Due to significant spreading, the vapour layer thickness is lower on convex surfaces than on concave surfaces, resulting in a greater dynamic Leidenfrost temperature. When comparing concave and convex surfaces with the same curvature diameter, Weber number and temperature, there is a noticeable decrease in contact time. Furthermore, it was discovered that for both convex and concave surfaces, the contact time increased with curvature diameter.