Leidenfrost Point Reduction on Micropatterned Metallic Surfaces
| Autor: | Albertus J. Huis in ’t Veld, Daniel Arnaldo del Cerro, Alvaro Marin, B. Pathiraj, Detlef Lohse, G.R.B.E. Römer |
|---|---|
| Přispěvatelé: | Physics of Fluids, Faculty of Engineering Technology, Faculty of Science and Technology |
| Rok vydání: | 2012 |
| Předmět: |
02 engineering and technology
Surface finish 01 natural sciences Leidenfrost effect 010305 fluids & plasmas Metal Optics 0103 physical sciences Electrochemistry Surface roughness General Materials Science IR-81840 Spectroscopy business.industry Chemistry Drop (liquid) Surfaces and Interfaces Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics METIS-288461 Boiling point Drag visual_art visual_art.visual_art_medium Levitation 0210 nano-technology business |
| Zdroj: | Langmuir, 28(42), 15106-15110. American Chemical Society Langmuir |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la302181f |
| Popis: | Droplets are able to levitate when deposited over a hot surface exceeding a critical temperature. This is known as the Leidenfrost effect. This phenomenon occurs when the surface is heated above the so-called Leidenfrost point (LFP), above which the vapor film between the droplet and hot surface is able to levitate the droplet. Such a critical temperature depends on several factors. One of the most studied parameters has been the surface roughness. Almost all of the experimental studies in the literature have concluded that the LFP increases with the roughness. According to these results, it seems that the roughness is detrimental for the stability of the vapor film. In contrast with these results, we present here a micropatterned surface that significantly reduces the LFP. The temperature increase, relative to the boiling point, required to reach the LFP is 70% lower than that on the flat surface. The reasons for such an effect are qualitatively and quantitatively discussed with a simple semiempirical model. This result can be relevant to save energy in applications that take advantage of the Leidenfrost effect for drop control or drag reduction. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|