Study of Arc Mobility and Reignition in a Static Gap Discharge with Magnetic Field
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Microstructure effect on reignition and welding properties of copper-tungsten electric contact
Copper-tungsten contacts are frequently used in high power circuit breakers and contactors in air, oil, SF/sub 6/, or vacuum. Arc interruption and anti-welding properties are important design parameters. In this study, we examined the effects of tungsten particle size on reignition and weld resistance in air. Oxidation and mechanical properties are also determined to find the optimum contact properties for arc erosion under thermal and mechanical stresses. Static gap arc erosion is used to supplement observations in a dynamic weld test. This avoided device mechanical variables that affect contact erosion.
Correlations for mass transfer between fluidized spheres and a liquid
Abstract Data on mass transfer between the solid particles and the liquid in a fluidized bed have been analyzed. After a convenient selection, various correlations have been derived. They show that for a given fluidized system, the Sherwood number is independent on the Reynolds number.