Abstract
The longitudinal dispersion of a finite slug of gas has been measured at various velocities by using a gas (1,3-butadiene) that absorbs in the ultra-violet region and passing the dispersed slug through a narrow beam of ultra-violet light of wavelength 250mμ. To avoid effects of differences in gas density, the second gas (1-butyne) was chosen to have the same molecular weight as butadiene. The range of applicability of Sir Geoffrey Taylor’s virtual coefficient of diffusivity has been discussed. The experimental observation that the peak mean concentration passes through a maximum value with velocity has been explained by considering the relative rates of dispersion by convection, longitudinal molecular diffusion and radial molecular diffusion.
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