The ‘Bullet-Piston’ (B-P) dynamic stressing technique has been used to study the tensile strength, Fc, of Newtonian and non-Newtonian fluids. A comparative study of the effects of viscosity on Fc for silicone oils (Newtonian) and aqueous polyacrylamide (PAA) solutions (non-Newtonian) was made. Both systems exhibited a power law dependency of the form Fc ∝ µn, where µ is the viscosity and n is the power index. For the Newtonian system, n was found to be 0.09 in close agreement with the findings of Couzens and Trevena (1974) for silicone oils whilst a value of 0.16 was found for the PAA solutions.

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