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Detection of changes in modulus and viscosity of wheat flour doughs by the “work technique” of muller et al
Author(s) -
Bloksma A. H.
Publication year - 1967
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740180203
Subject(s) - viscosity , work (physics) , extension (predicate logic) , elastic modulus , constant (computer programming) , modulus , thermodynamics , materials science , mathematics , mechanics , composite material , physics , computer science , programming language
At a given total extension both the recoverable (elastic) and the irrecoverable (viscous) work, as determined by Muller et al. 3 with the Brabender extensograph, depend on the modulus as well as on the viscosity of the test‐piece. A theoretical analysis shows that, at constant elastic extension, the elastic work depends on the modulus only, and is not affected by changes in viscosity. On the other hand, if a few simplifying assumptions are permitted, the total work at constant viscous extension depends on the viscosity, but not on the modulus. Therefore, plots of elastic work against (a function of) the elastic extension and of the total work against the viscous extension permit easier detection of changes in modulus and viscosity than do plots of elastic and viscous work against the total extension.