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RISS 인기검색어
- 검색키워드
- 저자 : Yusuf Uludag (검색결과 2 건)
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Kerim Yapici,Yusuf Uludag 한국유변학회 2013 Korea-Australia rheology journal Vol.25 No.4
Computational results for steady laminar flow of three different shear thinning fluids lid-driven square cavity are presented. The viscoelastic nature of the fluids is represented by linear and exponential Phan-Thien Tanner (PTT) and Giesekus constitutive models. Computations are based on finite volume technique incorporating non-uniform collocated grids. The stress terms in the constitutive equations are approximated by higher-order and bounded scheme of Convergent and Universally Bounded Interpolation Scheme for the Treatment of Advection (CUBISTA). Effects of the elasticity, inertia as well as constitutive model parameters on the stress and velocity fields, size and intensity of the primary and secondary vortexes are investigated and discussed in detail. Moreover highly accurate benchmark numerical solutions are provided for each considered constitutive model.
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Rheological characterization of polyethylene glycol based TiO2 nanofluids
Kerim Yapici,Nese K. Cakmak,Naciye Ilhan,Yusuf Uludag 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.4
Rheological characterization of TiO2 nanoparticle dispersions in polyethylene glycol (PEG 200) is presentedover 1-10 wt% particle mass fraction range in terms of shear viscosity, thixotropy and linear viscoelasticity. A stress controlled rheometer fitted by a cone-and-plate system was employed for the rheologicalmeasurements between –10oC and 40oC. The non-linear viscoelastic experiments revealed that TiO2-PEG200 nanofluid exhibits a shear thinning behavior when particle mass fraction exceeds 1%. No appreciablechange in the shear viscosity versus shear rate behavior was detected over the course of four days ofdispersion storage. At high particle concentrations the dispersions had a yield stress that was determined byfitting the results through Herschel-Bukley model. Within the studied range of particle concentration, noevidence of thixotropic behavior was observed. In addition, relative viscosity measured at high shear regionwas found to be independent of the temperature. On the other hand, strong temperature dependency wasobserved at low shear region particularly at high temperatures. Storage and loss moduli of the TiO2-PEG200 nanofluid were determined by frequency sweep measurements with applied stresses in the linearviscoelastic region. It was found that when the applied stress is lower than the corresponding yield stressTiO2-PEG 200 nanofluid showed a gel structure especially at high particle mass concentration.
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