A BRIEF STUDY ON THE MIXTURE RULES OF THE ACOUSTIC NONLINEARITY PARAMETER B A IN BINARY BIOLOGICAL MIXTURES/

Using the improved thermodynamic method, the acoustic non-linearity pa rameter B/A of binary biological mixtures - such as pig blood, sheep b lood and bovine blood - is measured in order to test the mixture rules proposed by Apfel and Sehgal. The results show that the B/A values of the above-mentioned blood decrease with an increasing volume fraction of water. The B/A value varies linearly with the volume fraction of p rotein. It is also shown that, treated as a binary mixture, the blood obeys the trend that the B/A value varies with the volume of water. Th is is in agreement with the rules proposed by Apfel and Sehgal. Howeve r, the measured B/A value is not exactly equal to that of the mixture rules.