The rheological characteristics of peanut butter were determined in two types of lubricated squeezing flow tests, one based on constant deformation rate and the other on deformation under constant stress (creep). Elongational flow was observed in both types of tests. When the flow regime was not governed by viscoelastic effects, peanut butter could be described as a power law fluid with consistency on the order of 70–200 KPa and flow index of 0.5–0.7.
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Campanella et al. (1987) studied this question.
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