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On the compressibility of bread dough
Roger I. Tanner,Shaocong Dai,Chunguang Wang 한국유변학회 2006 Korea-Australia rheology journal Vol.18 No.3
Few investigations of bread dough compressibility have been reported in the literature, despite the fact that high compression stresses are often reached in processing. Here we report some experiments on the compressibility of an Australian wheat bread dough under compressive stresses up to 5 MPa, and show that the results are consistent with a mathematical model of bread dough containing entrained air. The implications for tensile testing are also considered.
On the congruence of some network and pom-pom models
Roger I. Tanner 한국유변학회 2006 Korea-Australia rheology journal Vol.18 No.1
We show that some network and pom-pom constitutive models are essentially the same. Instead of the usual confrontation, we suggest that the two approaches can offer useful mutual support: vital information about network destruction rates found from detailed pom-pom calculations can be used to improve the network models, while deductions about network creation rates can pinpoint areas needing further attention in the tube modelling area.A new form of the PTT model, the PTT-X model, results in improved shear and elongational flow descriptions, plus an improved recoil behaviour. The remaining problems of strain-time separation, second normal stress difference description, and reduction of parameters are also discussed and some suggestions for progress are offered.
A phenomenological approach to suspensions with viscoelastic matrices
Tanner Roger I.,Qi Fuzhong The Korean Society of Rheology 2005 Korea-Australia rheology journal Vol.17 No.4
A simple constitutive model for viscoelastic suspensions is discussed in this paper. The model can be used to predict the rheological properties (relative viscosity and all stresses) for viscoelastic suspensions in shear and elongational flow, and the constitutive equations combine a 'viscoelastic' behaviour component and a 'Newtonian' behaviour component. As expected, the model gives a prediction of positive first normal stress difference and negative second normal stress difference; the dimensionless first normal stress difference strongly depends on the shear rate and decreases with the volume fraction of solid phase, but the dimensionless second normal stress difference (in magnitude) is nearly independent of the shear rate and increases with the volume fraction. The relative viscosities and all the stresses have been tested against available experimental measurements.
On the congruence of some network and pom-pom models
Tanner, Roger I. The Korean Society of Rheology 2006 Korea-Australia rheology journal Vol.18 No.1
We show that some network and pom-pom constitutive models are essentially the same. Instead of the usual confrontation, we suggest that the two approaches can offer useful mutual support: vital information about network destruction rates found from detailed pom-pom calculations can be used to improve the network models, while deductions about network creation rates can pinpoint areas needing further attention in the tube modelling area. A new form of the PTT model, the PTT-X model, results in improved shear and elongational flow descriptions, plus an improved recoil behaviour. The remaining problems of strain-time separation, second normal stress difference description, and reduction of parameters are also discussed and some suggestions for progress are offered.
A phenomenological approach to suspensions with viscoelastic matrices
Roger I. Tanner,Fuzhong Qi 한국유변학회 2005 Korea-Australia rheology journal Vol.17 No.4
A simple constitutive model for viscoelastic suspensions is discussed in this paper. The model can be used to predict the rheological properties (relative viscosity and all stresses) for viscoelastic suspensions in shear and elongational flow, and the constitutive equations combine a viscoelastic behaviour component and a Newtonian behaviour component. As expected, the model gives a prediction of positive first normal stress difference and negative second normal stress difference; the dimensionless first normal stress difference strongly depends on the shear rate and decreases with the volume fraction of solid phase, but the dimensionless second normal stress difference (in magnitude) is nearly independent of the shear rate and increases with the volume fraction. The relative viscosities and all the stresses have been tested against available experimental measurements.
Relative viscosity of bimodal suspensions
Fuzhong Qi,Roger I. Tanner 한국유변학회 2011 Korea-Australia rheology journal Vol.23 No.2
A new differential (or multi-scale, mean field approach) model for the relative viscosity of bimodal suspensions is discussed in this paper. Solid spherical particles with a bimodal size distribution in a Newtonian solvent are considered. The problem of random close packing for a bidisperse system is studied. The bounds on volume fractions are given by 0.639<φ_(bm)<0.869, where the random close packing volume fraction for a monodisperse system, φ_(rcp)=0.639, is assumed. We propose that the bimodal suspension has a dominant large particle composition and that the small particles fill the empty spaces between the large particles. The model can therefore be based on the theory of monodisperse suspensions. The predictions of the relative viscosity for several bimodal suspensions given by the model are compared to experimental measurements. A reasonably good agreement is observed.
Relative viscosity of bimodal suspensions
Qi, Fuzhong,Tanner, Roger I. 한국유변학회 2011 Korea-Australia rheology journal Vol.23 No.2
A new differential (or multi-scale, mean field approach) model for the relative viscosity of bimodal suspensions is discussed in this paper. Solid spherical particles with a bimodal size distribution in a Newtonian solvent are considered. The problem of random close packing for a bidisperse system is studied. The bounds on volume fractions are given by o.639 < ${\varphi}_{bm}$ < 0.869, where the random close packing volume fraction for a monodisperse system, ${\varphi}_{rcp}$ = 0.639, is assumed. We propose that the bimodal suspension has a dominant large particle composition and that the small particles fill the empty spaces between the large particles. The model can therefore be based on the theory of monodisperse suspensions. The predictions of the relative viscosity for several bimodal suspensions given by the model are compared to experimental measurements. A reasonably good agreement is observed.
On the compressibility of bread dough
Wang, Chunguang,Dai, Shaocong,Tanner, Roger I. The Korean Society of Rheology 2006 Korea-Australia rheology journal Vol.18 No.3
Few investigations of bread dough compressibility have been reported in the literature, despite the fact that high compression stresses are often reached in processing. Here we report some experiments on the compressibility of an Australian wheat bread dough under compressive stresses up to 5 MPa, and show that the results are consistent with a mathematical model of bread dough containing entrained air. The implications for tensile testing are also considered.