Fuzhong Qi
University of Sydney
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Publication
Featured researches published by Fuzhong Qi.
Journal of Rheology | 2013
Shaocong Dai; Erwan Bertevas; Fuzhong Qi; Roger I. Tanner
We present the results of measuring the three viscometric functions [the relative viscosity ηr, and the first (N1) and second (N2) normal stress differences] for nominally monosize sphere suspensions in a silicone fluid, which is nominally Newtonian. The measurements of ηr and N1−N2 were made with a parallel-plate rheometer, while we used the open semicircular trough method to give N2 directly. With the trough method measurements of N2 could be made down to a 10% concentration (φ=0.1); measurements were continued up to 45% concentration. The trough surface shows visually that N2 is directly proportional to the shear stress τ, and the measurements of N2 agree quite well with the results of Zarraga et al. [J. Rheol. 44, 185–220 (2000)] in the range where concentrations overlap (0.3–0.45) and with those of later investigators. The results for N1 show greater scatter. In the range 0.1≤φ≤0.45, our best estimate of N2/τ is −4.4φ3 and that of N1/τ is −0.8φ3. Hence, the magnitude of N2 is much greater than that o...
Rheologica Acta | 2012
Fuzhong Qi; Roger I. Tanner
Multimodal suspensions, consisting of non-colloidal spherical particles and a Newtonian matrix, are considered. A new differential (or multi-scale mean field approach) model for the relative viscosity of multimodal suspensions has been developed. The problem of the random close packing fraction of the solid phase is also investigated. We suppose that the multimodal suspension has a dominant large particle composition and that the smaller particles are embedded in the empty space between the larger particles. The relative viscosity model can therefore be based on the theory of monomodal suspensions. Experimental data of Eveson are compared to the predictions given by using three different models of monomodal suspensions respectively. The Maron–Pierce approach appears to give the best agreement with Eveson’s experiments. However, due to experimental uncertainties, we recommend that the Mendoza and Santamaria-Holek (MSH) formula be adopted.
Journal of Rheology | 2014
Shaocong Dai; Fuzhong Qi; Roger I. Tanner
We have measured the viscometric functions (η, N1, and N2) for a suspension of noncolloidal spherical particles in a Boger fluid matrix. The polymethyl methacrylate particles were nominally 40 μm in size, and the matrix fluid was similar to that used by Zarraga et al. [J. Rheol. 45, 1065–1084 (2001)]. The volume concentrations (ϕ) ranged from 5% to 40%, and a combination of the open trough and parallel-plate methods was used. The viscosity did not shear-thin for higher concentrations, unlike the Newtonian matrix case; for the larger concentrations we saw a mild shear-thickening. This is in agreement with the work of Zarraga et al. [J. Rheol. 45, 1065–1084 (2001)] and Scirocco et al. [J. Rheol. 49, 551–567 (2005)]. N2 was always negative, and its magnitude increased with concentration. N1 was initially positive as in the matrix fluid, but for ϕ>0.3, it became negative, similar to the result of Aral and Kalyon [J. Rheol. 41, 599–620 (1997)]; also, we found, at a constant shear stress, that |N2/N1| was great...
Rheologica Acta | 2013
Roger I. Tanner; Fuzhong Qi; Shaocong Dai
We have collected six sets of results for the ratio of the second normal stress difference to the shear stress
Rheologica Acta | 2013
Roger I. Tanner; Fuzhong Qi; S. Uthayakumaran; Shao Cong Dai
(N_{2}/\tau )
Cereal Research Communications | 2014
S. Uthayakumaran; Roger I. Tanner; Shaocong Dai; Fuzhong Qi; C. W. Wrigley
in non-colloidal suspensions of spheres in Newtonian matrices. They all show a near-cubic dependence on the volume fraction
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2010 (ICCMSE-2010) | 2015
Roger I. Tanner; Fuzhong Qi; Shaocong Dai
\varphi
Journal of Non-newtonian Fluid Mechanics | 2008
Roger I. Tanner; Fuzhong Qi; Shaocong Dai
in the range
Journal of Non-newtonian Fluid Mechanics | 2005
Roger I. Tanner; Fuzhong Qi
0.1 < \varphi < 0.5
Journal of Non-newtonian Fluid Mechanics | 2007
Roger I. Tanner; Shaocong Dai; Fuzhong Qi
, in contrast to the square law predictions of Brady and Morris (J Fluid Mech 348:103–139, 1997) for dilute suspensions. We suggest that the difference can be resolved by using a dependence on the square of the effective volume fraction
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Commonwealth Scientific and Industrial Research Organisation
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