Effect of the liquid temperature on the interaction behavior for single water droplet impacting on the immiscible liquid*

Abstract

The interaction of single water droplet impacting on immiscible liquid surface was focused with the temperature varying from 50 °C to 210 °C. The impact behavior is recorded with a high-speed camera running at 2000 frames per second. It is found that droplet diameter, oil temperature, and Weber number have important influences on impact behaviors. Three typical phenomena, including penetration, crater-jet, and crater-jet–secondary jet, were observed. Penetration only occurs when the Weber number is below 105. With Weber number increasing to 302, the jet begins to appear. Moreover, to gain deeper physical insight into the crater formation and jet formation, the energy of droplet impingement onto the liquid pool surface was estimated. The oil temperature has a significant effect on the energy conversion efficiency. High temperature is beneficial to improve energy conversion efficiency.

Facile Fabrication of a Robust Superhydrophilic/Underwater Superoleophobic Material for Oil-Fouling Expulsion

“…In addition, the interfacial tension between different oils/water and the SUSS should be considered and can be described as the adhesion work W between oil/water and the SUSS. Thus, σ o‑w and W can be calculated as follows, , the means of u in formula is the characteristic flow rate of water; according to the similarity criterion, it could be considered water rate flow u . The means of θ in formula is the CA of water to SUSS. σ normalo ‐ normalw = ρ u 2 l W normale W = σ normalL normalV ( 1 + cos ⁡ θ ) …”