Power spectra observed in laser scattering from moving, polydisperse particle systems in flames—I. Theory

Aerosol formation in an isothermal stagnation flow

“…This is the relative uncertainty of the results. The absolute values of particle size have been shown to compare well with direct microscope measurements if the conditions for the theory of LDS are satisfied (Hinds and Reist, 1972 (a,b); Penner et al 1976). Equation (1) not only assumes a uniform flow field but also assumes a monodisperse aerosol.…”

“…[2] k is the Boltzmann constant, T is the gas temperature and t/is the absolute viscosity of the gas, in this case taken to be the viscosity of air at 293 K. Equation (1) is appropriate for either stationary aerosols or for flows with a uniform velocity (see Penner et al (1976) for more details). The flow in the present experiment is not, however, uniform but exhibits a velocity gradient.…”

“…3 shows the relationship of measured H.W. with sin 2 (0/2) which should be a straight line according to theory (Penner et al 1976). The results indicate that the system performs as expected.…”

Measurement of the fluid-velocity profile using a self-mixing superluminescent diode

“…Reported equations have been obtained considering axisymmetric flow in D, single scattering regime and negligible absorption effects. Conversely, a detailed analysis of the theoretical output provided by a 'conventional'-coherent source-LDV is well known and widely discussed in the literature [1,2,9,13,[26][27][28] and the extension to the low coherence source may be quite straightforward.…”