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Concerning the Problems in Comparison of Drop Number Distribution Obtained by Spatial and Temporal Methods

The possibilities available in principle of measuring distributions of drop size and/or velocity in spray cones and their physical/ technical statements as a number concentration on the one hand and a number rate on the other are described, as well as their mutual conversion. Two-dimensional distributions of drop size and velocity, measured by a short-time double-flash photographic method (DFP) and a Laser-Doppler-Velocity-Sizemeter (LDVS) in a spray cone, are compared with each other and discussed in detail Particular attention is paid to the spray boundary conditions and their influence on the measurement results.