Webthe present experiments indicate a very di erent drag-reduction mechanism due to the presence of the vapor layer. For a smooth solid sphere, the delayed separa-tion is due … WebMay 23, 2011 · We demonstrate and quantify a highly effective drag reduction technique that exploits the Leidenfrost effect to create a continuous and robust lubricating vapor layer on the surface of a heated solid sphere moving in a liquid. Using high-speed video, …

Steerable drops on heated concentric microgroove arrays

WebLeidenfrost vapor layer in a liquid exhibits signi cant drag reduction during free fall. ... on drag reduction caused by the presence of a stable Leidenfrost vapor layer on a sphere 4. 10 2 10 3 10 4 10 5 Re 10 6 C D 0.4 0.2 0.6 0.8 0 PP11 PP10 PP3 Water, 95°C Standard drag curve FIG. 1. Experimental data showing the variation of the drag coe ... WebOct 14, 2016 · The creation of a low-temperature Leidenfrost state with a continuous and thick vapor film in between the rotor and the water leads to an apparent slip layer and … is thai language close to vietnamese

Thermo-fluid-dynamics of inverse Leidenfrost levitation of small …

WebJun 25, 2014 · We demonstrate and quantify a highly effective drag reduction technique that exploits the Leidenfrost effect to create a continuous and robust lubricating vapor layer on the surface of a heated ... WebWe demonstrate and quantify a highly effective drag reduction technique that exploits the Leidenfrost effect to create a continuous and robust lubricating vapor layer on the surface of a heated solid sphere moving in a liquid. Using high-speed video, we show that such vapor layers can reduce the hydrodynamic drag by over 85%. These results appear to … WebAug 1, 2016 · Drag reduction by leidenfrost vapor layers. Phys. Rev. Lett. (2011) G. Lagubeau et al. Leidenfrost on a ratchet. Nat. Phys. ... The formation of a thermally insulating vapor layer at the Leidenfrost state poses a major concern for heat transfer performance and safety operation of many phase change thermal systems. It is desirable … igcse revision