A general method for obtaining shear stress and normal stress functions from parallel disk rheometry data
Yeow, Y. Leong, Chandra, Dolly, Sardjono, Albert A., Wijaya, Hartono, Leong, Yee-Kwong, and Khan, Ash (2005) A general method for obtaining shear stress and normal stress functions from parallel disk rheometry data. Rheologica Acta, 44 (3). pp. 270-277.
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The problems of converting the torque and normal force versus rim shear rate data generated by parallel disk rheometers into shear stress and normal stress difference as functions of shear rate are formulated as two independent integral equations of the first kind. Tikhonov regularization is used to obtain approximate solutions of these equations. This way of handling parallel disk rheometer data has the advantage that it is independent of the rheological constitutive equation and noise amplification is kept under control by the user-specified parameter in Tikhonov regularization. If the fluid under test exhibits a yield stress, Tikhonov regularization computation will simultaneously give an estimate of the yield stress. The performance of this method is demonstrated by applying it to a number of data sets taken from the published literature and to laboratory measurements conducted specifically for this investigation.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||integral equation; inverse problem; non-newtonian viscosity; normal stress; Tikhonov regularization|
|FoR Codes:||09 ENGINEERING > 0904 Chemical Engineering > 090499 Chemical Engineering not elsewhere classified @ 100%|
|SEO Codes:||86 MANUFACTURING > 8606 Industrial Chemicals and Related Products > 860699 Industrial Chemicals and Related Products not elsewhere classified @ 100%|
|Deposited On:||22 Mar 2010 15:19|
|Last Modified:||18 Oct 2013 00:53|
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