Jet ejection from droplets near the Leidenfrost temperature

Abstract

Droplets impinging on a hot surface that is near the Leidenfrost temperature were experimentally investigated. Ejection of jets from the top of the droplet was observed during the transient interaction between the droplet and a hot wall. We term this phenomenon jet ejection from droplets. When the bottom of the droplet initially impacts the hot surface, a jet is to be ejected from the top of the droplet. The jet ejection occurred only at low impact velocities and around the wetting limit temperature. It was not observed when droplets were dropped from large heights or when the surface was at a high temperature.

Fabrication of thin inorganic temperature-sensitive paint using ball milling and its temporal response delay

“…Ozawa [11] developed the fast-response thin TSP and obtained time sequential temperature images using a high-speed camera at a temporal resolution of 71 µs. In addition, because boiling is a dynamic phenomenon, its visualization requires a measurement system with a high temporal resolution [12][13][14][15]. One of authors [15] investigated an interesting behavior of a jet-ejected boiling droplet near the Leidenfrost temperature.…”

“…In addition, because boiling is a dynamic phenomenon, its visualization requires a measurement system with a high temporal resolution [12][13][14][15]. One of authors [15] investigated an interesting behavior of a jet-ejected boiling droplet near the Leidenfrost temperature. The behavior of splashing droplet was observed using a high-speed camera 30 000 frames per second (fps).…”

“…The behavior of splashing droplet was observed using a high-speed camera 30 000 frames per second (fps). When a droplet impinges on a superheated surface near the Leidenfrost temperature, it jumps, and an unusual dynamic phenomenon occurs in a very short time [15].…”