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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

DROPLET IMPACT BEHAVIOR ON MICRO-STRUCTURED SURFACE FROM BOILING TEMPERATURE TO LEIDENFROST TEMPERATURE

Su Cheong Park
Pohang University of Science and Technology, Pohang, Republic of Korea

Seok Won Han
Incheon National University, Incheon, Republic of Korea

Gyu Hyun Shim
Incheon National University, Incheon, Republic of Korea

Byoung Tak Kong
Incheon National University, Incheon, Republic of Korea

Ho Seon Ahn
Incheon National University, Incheon, Republic of Korea

Abstract

In this study, droplet impact behavior on heated micro-structures has been investigated. We present droplet impact behavior from boiling point to Leidenfrost point on structured silicon surfaces. The given surfaces consist of bundles of micro scale pillars which are manufactured by Deep reactive-ion etching (DRIE) process. The structured surfaces are designed as D4S4, D8S8, D40S40, and D80S80 where D is diameter of pillar and S is space of pillars (micro meter). A deionized water droplet was impinged onto heated surface and the surface temperature is ranging from 100 to 340 degree Celsius and droplet impact behavior was visualized by high speed camera. The cooling performance was analyzed by droplet evaporating time and droplet impact behavior on structured surface. The results of droplet impact experiments on a structured surface were compared with each cases. Five distinct droplet impact modes were identified, including "droplet burst" and droplet impact behavior, which was significantly affected by structure geometry on the surface, such as having the Leidenfrost temperature increase with decreasing structure size. This approach would lead the effects of surface roughness and capillary wicking on droplet impact phenomena.

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