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NMR VELOCIMETRY STUDY OF THE TEMPERATURE DEPENDENT RHEOLOGY OF BUTTER, SEMISOFT BUTTER AND MARGARINE
Author(s) -
BRITTON M. M.,
CALLAGHAN P. T.
Publication year - 2000
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.2000.tb00288.x
Subject(s) - rheology , velocimetry , materials science , shear thinning , couette flow , power law , composite material , mechanics , flow (mathematics) , physics , mathematics , statistics
A new rheological characterization technique is described in which nuclear magnetic resonance (NMR) velocimetry is used to measure velocity profiles across the annular gap of a Couette cell, for materials that exhibit yield stress and power law shear thinning properties. The materials studied were butter, semi‐soft butter and margarine over a temperature range from 25C to 42C. The method enables the observation of heterogeneous behavior across the different stress regimes that are present in the Couette gap and flow visualization makes it possible to clearly identify the existence or absence of slip effects at the wall. The results show that the power law exponents are strongly temperature dependent for the edible fat materials investigated.