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RISS 인기검색어
- 검색키워드
- 저자 : Peter J. Scales (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Compressive rheology of aggregated particulate suspensions
Peter J. Scales,Shane P. Usher,Brendan Gladman 한국유변학회 2006 Korea-Australia rheology journal Vol.18 No.4
The measurement of the compressional rheological parameters for an aggregated particulate suspension is described. The parameters include the compressive yield stress and hindered settling function, describing the extent and rate of dewatering respectively. The variation of these parameters with shear rate and time of shear is also considered in the light of their sensitivity to low shear rates, with particular reference to the case of flocculated particulate suspensions. The latter is seen to be important in the future development of a comprehensive understanding of compressive rheology of aggregated particulate suspensions in industrial applications such as thickening, filtration and centrifugation.
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Compressive rheology of aggregated particulate suspensions
Gladman Brendan,Usher Shane P.,Scales Peter J. The Korean Society of Rheology 2006 Korea-Australia rheology journal Vol.18 No.4
The measurement of the compressional rheological parameters for an aggregated particulate suspension is described. The parameters include the compressive yield stress and hindered settling function, describing the extent and rate of dewatering respectively. The variation of these parameters with shear rate and time of shear is also considered in the light of their sensitivity to low shear rates, with particular reference to the case of flocculated particulate suspensions. The latter is seen to be important in the future development of a comprehensive understanding of compressive rheology of aggregated particulate suspensions in industrial applications such as thickening, filtration and centrifugation.
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Viscoelasticity of coagulated alumina suspensions
Kumar, Ashish,Stickland, Anthony D.,Scales, Peter J. 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.2
The solid-to-liquid transition of a model coagulated alumina suspension at concentrations above the gel point was investigated to explore the critical parameter for describing network failure under shear forces. Static (creep and creep-recovery) and dynamic (small and large amplitude oscillatory) shear experiments were combined to examine shear softening in these systems and time-based dependence in the yielding dynamics. The particulate network structure exhibits failure and viscous dissipation under creep and oscillatory shear tests at stress values well below the conventionally defined yield stress. Results from strain recovery tests highlight a time-dependence for failure, where only partial recovery of strain energy was possible once a specific duration of creep was surpassed. The system was observed to fail at a common strain value across all methods of rheology testing. These results are self-consistent, showing a clear transition from the linear to non-linear viscoelastic region for a coagulated material under shear stress. It provides the starting point to incorporate mechanical viscoelastic models to extract time constants for yielding behaviour. This work also presents one of the first reported LAOS and creep results for particulate suspensions using a vane geometry.
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Viscoelasticity of coagulated alumina suspensions
Ashish Kumar,Anthony D. Stickland,Peter J. Scales 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.2
The solid-to-liquid transition of a model coagulated alumina suspension at concentrations above the gel point was investigated to explore the critical parameter for describing network failure under shear forces. Static (creep and creep-recovery) and dynamic (small and large amplitude oscillatory) shear experiments were combined to examine shear softening in these systems and time-based dependence in the yielding dynamics. The particulate network structure exhibits failure and viscous dissipation under creep and oscillatory shear tests at stress values well below the conventionally defined yield stress. Results from strain recovery tests highlight a time-dependence for failure, where only partial recovery of strain energy was possible once a specific duration of creep was surpassed. The system was observed to fail at a common strain value across all methods of rheology testing. These results are self-consistent, showing a clear transition from the linear to non-linear viscoelastic region for a coagulated material under shear stress. It provides the starting point to incorporate mechanical viscoelastic models to extract time constants for yielding behaviour. This work also presents one of the first reported LAOS and creep results for particulate suspensions using a vane geometry.
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Effect of sodium dodecylbenzene sulfonate on the dispersion stability of ceramic glaze suspension
Suphapan Satchawan,Orn-anong Arqueropanyo,Wimol Naksata,Chairoj Rattanakawin,Sakdiphon Thiansem,Preecha Panya,Ponlayuth Sooksamiti,Peter J. Scales 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
Sodium dodecylbenzene sulfonate (SDBS) was used to render the stability of ceramic glaze dispersionwhich is composed of limestone, feldspar, quartz, kaolin and ferric oxide. The measured zeta potential showed negativevalues for the systems in deionized water and 0.001 M MgCl2 media at pH above 2, but a positive value was observedin 0.1M MgCl2 at pH higher than 6.7. Adsorption of SDBS in aqueous suspensions of ceramic glaze in deionized waterand in 0.001 M MgCl2, within the concentration range studied, followed both the Langmuir and Freundlich isotherms,but the Freundlich isotherm was more favored. Adsorption of SDBS in 0.1M MgCl2 corresponded to the Freundlichisotherm. From dispersion stability investigation, SDBS could render the suspension in deionized water and in 0.001mM MgCl2 more than in 0.1 mM MgCl2.
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