Details

Autor(en) / Beteiligte

• Okuyama, Kunito
• Yoshida, Kensuke

Titel

Dynamic behavior with rapid evaporation of an inkjet water droplet upon collision with a high-temperature solid above the limit of liquid superheat

Ist Teil von

• International journal of heat and mass transfer, 2018-01, Vol.116, p.994-1002

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Spontaneous nucleation is observed at the temperature to significantly exceed the kinetic superheat limit.•Solid surface temperature significantly decreases during the spontaneous nucleation.•Decrease in surface temperature may affect subsequent phase-change phenomena that occur on the micro-scale. The dynamic behavior of the rapid evaporation of an inkjet droplet of water upon collision with a high-temperature silicon substrate has been investigated experimentally. The colliding droplet spreads into a thin disk-shaped liquid film and then splashes away. The splashing behavior depends on the solid temperature, which varies significantly due to nucleation and evaporation while spreading along the solid surface. Even when the temperature of the contact interface of the substrate, as estimated by transient heat conduction, significantly exceeds the kinetic limit of liquid superheat, numerous fine bubbles are simultaneously generated, presumably by spontaneous nucleation, beneath the liquid film and break up the film, which is dispersed into fine droplets. The surface temperature at the collision point is measured using a small platinum film sensor and exhibits a significant decrease compared to the heat conduction to the liquid for this peculiar nucleation.