EFFECT OF MEASURING VOLUME

The procedure of continuum counterpart of time averaging for successive arrival time of particles Ati and averaging window of time At covering O[102] particles to control the statistical error. 

AZj is the particle flow area allocated to particle i in the principal flow direction (axial), m or d. for spherical particles, Azj, and Wp (axial component of particle velocity t/p)were given by the PDPA using, say, the green beams of the LDV. The details constituting Azi (Saffman, 1987) as applied to our study were discussed in van de Wall and Soo, 1994, along with the relation between particle concentration and probe volume. The local axial component of the particle cloud velocity is now  

For the transverse component of particle cloud velocity, since An is not readily determined, Up is determined by, using the data from, say, the blue beams of the LDV, 

This introduction illustrates a common concern of probe dimension or measuring volume in relation to particle size or spacing in the evaluation of measured data. Instrumentation and devices in the following chapters are 

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