By S.L. Soo
Essentially the most unique and efficient learn experts within the box of particle-fluid circulate structures are assembled during this e-book, that is a major and present reference quantity. The ebook specializes in equipment of dimension and innovations for engineers
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1 is said to be Ohmic; whereas, a material following a non-liner power law such as v-1” in the current-voltage characteristic is non-Ohmic. Non-Ohmic behavior has been discussed by Lampert and Mark (1970), Lacharme (1978), and Kingery (1976). An alternative representation of the volume resistivity 93 is its reciprocal or electrical conductivity c= 3 t - l For isotropic samples, the material resistivity (or conductivity) is independent of the direction of the applied field. The resistivity depends primarily on the material temperature and is independent of the size of the sample (Weast, 1970).
Due to the actual cut-off nature of a stage, some oversize particles (d, > do) fail to be collected while some undersize particles (d, > d50)are captured by the impaction. It is noted that a real impactor will collect the same amount of particles as the ideal stage if the amount of uncollected larger particles matches that of collected smaller particles. With that concern, an effective cut-off diameter (ECD) of an impaction stage is defined as the diameter where the amount of uncollected larger particles equals that of collected smaller particles.
19 Schematic collection eficiencies of a three-stage cascade impactor 36 Instrumentation for Fluid-Particle Flow Particle aerodynamic size distributions can be obtained from the measurements of particle mass on each impaction stage of a cascade impactor. However, the analysis is normally not quite straight forward. 19, it is evident that the same sized particles may be collected on several impaction stages instead of on a single stage. This particle size overlapping increases the difficulties of the analysis.
Instrumentation for Fluid-Particle Flow by S.L. Soo