SIMULTANEOUS MEASUREMENT OF CONTINUOUS AND DISPERSED PHASE IN A 2 PHASE JET FLOW

In the present paper, a method is proposed and applied in order to inc rease the size range sensitivity of a Phase-Doppler-Anemometry (PDA) s ystem, allowing simultaneous measurement of size and velocity distribu tions of continuous and dispersed phases in gaseous, dispersed two pha se flow. Discrimination between the two phases is here directly achiev ed from the detected phase difference. Design considerations are prese nted to increase the size range sensitivity of the PDA system to appro ximately 1:200. Therefore, the optical properties for light scattering of the particles are properly adjusted to the measurement problem by colouring the particles homogeneously. The application of the system i s described by measurements of velocity profiles in a zone close to th e nozzle of a two phase jet with a tracer to particle diameter range o f 1 to 160 mu m. (C) 1998 Elsevier Science Ltd. All rights reserved.