Abstract
The dilatational relaxation spectra of a number of crude oil/air systems have been determined using both the first-order approximations of Ferry et al., and an exact method first described by Wiff. The inferred spectra have been correlated with measured foamability indices, and it has been shown that a decrease in foamability index correlates with a shift in the spectral maximum to longer relaxation times. A contrast is also drawn between the behaviour of defoamers and pro-foamers. The exact method of spectra determination gives rise to line spectra positioned at relaxation times corresponding to the peaks of the first-order spectra. The use of Cole—Cole plots to justify these single line spectra is outlined.
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