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Full-Text Articles in Engineering
The Effect Of Oxygen On Properties Of Zirconium Metal, Jie Zhao
The Effect Of Oxygen On Properties Of Zirconium Metal, Jie Zhao
Doctoral Dissertations
The influence of oxygen on the thermophysical properties of zirconium has been investigated using MSL-EML (Material Science Laboratory Electromagnetic Levitator) on ISS (International Space Station) in collaboration with NASA (National Aeronautics and Space Administration), ESA (European Space Agency), and DLR (German Aerospace Center). Zirconium samples with different oxygen concentrations was subjected to multiple melt cycles during which the thermophysical properties, such as density, viscosity and surface tension, have been measured at various undercooled and superheated temperatures. Also, there are melt cycles for verifying the solidification mechanism. Similar samples were found to show anomalous nucleation of the solid for certain ranges …
Surface Driven Flows : Liquid Bridges, Drops And Marangoni Propulsion, Samrat Sur
Surface Driven Flows : Liquid Bridges, Drops And Marangoni Propulsion, Samrat Sur
Doctoral Dissertations
Molecules sitting at a free liquid surface against vacuum or gas have weaker binding than molecules in the bulk. The missing (negative) binding energy can therefore be viewed as a positive energy added to the surface itself. Since a larger area of the surface contains larger surface energy, external forces must perform positive work against internal surface forces to increase the total area of the surface. Mathematically, the internal surface forces are represented by surface tension, defined as the normal force per unit of length. One common manifestation of surface tension is the difference in pressure it causes across a …