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Alberto Montesi

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Papers by Alberto Montesi

Research paper thumbnail of UPGRADING HEAVY HYDROCARBON OILS

Research paper thumbnail of Interplay of flow and microstructure in complex fluids: Semiflexible polymer solutions and emulsions

This thesis investigates the interactions between inicrostructural properties and flow conditions... more This thesis investigates the interactions between inicrostructural properties and flow conditions in polymeric solutions and in emulsions. An efficient algorithm is presented for Brownian dynamics simulations of semiflexible bead-rod chains with configuration-dependent anisotropic bead friction tensor. The algorithm for the dynamics and the stress generalizes an earlier one restricted to isotropic, configuration-independent friction (Grassia and Hinch 1996); it is based

Research paper thumbnail of Dynamics of Polymer Translocation through Nanopores: Theory Meets Experiment

Physical Review Letters, 2006

Research paper thumbnail of Flow Assurance Challenges in Deepwater Gas Developments

Proceedings of Asia Pacific Oil and Gas Conference and Exhibition, 2007

Research paper thumbnail of Flow Assurance Challenges in Indonesia Deepwater Gas Developments

Asia Pacific Oil and Gas Conference and Exhibition, 2007

Research paper thumbnail of Asphaltene Management in GOM DW Subsea Development

Offshore Technology Conference, 2011

Research paper thumbnail of Vorticity Alignment and Negative Normal Stresses in Sheared Attractive Emulsions

Physical Review Letters, 2004

Research paper thumbnail of Collapse of a semiflexible polymer in poor solvent

Research paper thumbnail of Brownian dynamics algorithm for bead-rod semiflexible chain with anisotropic friction

The Journal of Chemical Physics, 2005

Research paper thumbnail of Dynamics of polymer translocation through a nanopore induced by different sizes of crowding agents

The Journal of Chemical Physics, 2013

Research paper thumbnail of Time-Dependent Rheology of a Model Waxy Crude Oil with Relevance to Gelled Pipeline Restart †

Energy & Fuels, 2009

... Jules J. Magda ... 2 shows the results of this rheological gelation test obtained for the mod... more ... Jules J. Magda ... 2 shows the results of this rheological gelation test obtained for the model waxy oil using oscillatory shear parameters similar to those shown to be appropriate by Venkatesan et al.:(10) stress oscillation amplitude, 0.3 Pa; oscillation frequency, 0.126 rad/s; cooling ...

Research paper thumbnail of Measuring the particle size of a known distribution using the focused beam reflectance measurement technique

Chemical Engineering Science, 2008

Research paper thumbnail of Stochastic Spectral Dynamics of Single Semiflexible Filaments in Shear Flow

We develop a model of single semiflexible biopolymers in shear flow including stochastic (thermal... more We develop a model of single semiflexible biopolymers in shear flow including stochastic (thermal) forcing which is perturbative in (length)/(persistence length). The appropriate eigenfunctions are used to reduce the nonlinear stochastic partial differential equation to a high-dimensional stochastic dynamical system. The decomposition chosen gives a natural separation between slow and fast bending modes such that even a two- or three-

Research paper thumbnail of Buckling instability of dilute semiflexible rods in shear flow: effects on conformational and rheological properties

We have studied the dynamics of worm-like polymers in dilute solutions under shear flow and the e... more We have studied the dynamics of worm-like polymers in dilute solutions under shear flow and the effects on conformational and material properties of the two relevant dimensionless numbers, the ratio between contour length L and persistence length L_p, and the product of shear rate and relaxation time--the Weissenberg number Wi = dotgamma tau. We focus on chains with L /

Research paper thumbnail of The stochastic spectral dynamics of bending and tumbling

Research paper thumbnail of The propagation of pressure in a gelled waxy oil pipeline as studied by particle imaging velocimetry

AIChE Journal, 2012

ABSTRACT Paraffinic crude oils in pipelines may form waxy gels during flow shutdowns. These gels ... more ABSTRACT Paraffinic crude oils in pipelines may form waxy gels during flow shutdowns. These gels can be dislodged by applying pressure if the wall shear stress, proportional to the local pressure gradient, exceeds the gel yield stress. The simplest models assume that the axial pressure profile becomes linear immediately after a jump in upstream pressure, but this fails to account for gel time-dependent rheology or the effect of gel voids on pressure wave propagation. To investigate the former factor, pressure profile and particle imaging velocimetry (PIV) measurements were performed on a model oil gelled under pressure to reduce void formation. After a jump in upstream pressure to a value insufficient to restart flow, the axial pressure profile becomes linear in a two-step process, with an immediate small rise in downstream pressure followed by a time-delayed jump. The local downstream gel deformation measured by PIV exhibits similar two-step time dependence. © 2011 American Institute of Chemical Engineers AIChE J, 2012

Research paper thumbnail of Nuclear Magnetic Resonance Analysis of Methane Hydrate Formation in Water-in-Oil Emulsions

Research paper thumbnail of UPGRADING HEAVY HYDROCARBON OILS

Research paper thumbnail of Interplay of flow and microstructure in complex fluids: Semiflexible polymer solutions and emulsions

This thesis investigates the interactions between inicrostructural properties and flow conditions... more This thesis investigates the interactions between inicrostructural properties and flow conditions in polymeric solutions and in emulsions. An efficient algorithm is presented for Brownian dynamics simulations of semiflexible bead-rod chains with configuration-dependent anisotropic bead friction tensor. The algorithm for the dynamics and the stress generalizes an earlier one restricted to isotropic, configuration-independent friction (Grassia and Hinch 1996); it is based

Research paper thumbnail of Dynamics of Polymer Translocation through Nanopores: Theory Meets Experiment

Physical Review Letters, 2006

Research paper thumbnail of Flow Assurance Challenges in Deepwater Gas Developments

Proceedings of Asia Pacific Oil and Gas Conference and Exhibition, 2007

Research paper thumbnail of Flow Assurance Challenges in Indonesia Deepwater Gas Developments

Asia Pacific Oil and Gas Conference and Exhibition, 2007

Research paper thumbnail of Asphaltene Management in GOM DW Subsea Development

Offshore Technology Conference, 2011

Research paper thumbnail of Vorticity Alignment and Negative Normal Stresses in Sheared Attractive Emulsions

Physical Review Letters, 2004

Research paper thumbnail of Collapse of a semiflexible polymer in poor solvent

Research paper thumbnail of Brownian dynamics algorithm for bead-rod semiflexible chain with anisotropic friction

The Journal of Chemical Physics, 2005

Research paper thumbnail of Dynamics of polymer translocation through a nanopore induced by different sizes of crowding agents

The Journal of Chemical Physics, 2013

Research paper thumbnail of Time-Dependent Rheology of a Model Waxy Crude Oil with Relevance to Gelled Pipeline Restart †

Energy & Fuels, 2009

... Jules J. Magda ... 2 shows the results of this rheological gelation test obtained for the mod... more ... Jules J. Magda ... 2 shows the results of this rheological gelation test obtained for the model waxy oil using oscillatory shear parameters similar to those shown to be appropriate by Venkatesan et al.:(10) stress oscillation amplitude, 0.3 Pa; oscillation frequency, 0.126 rad/s; cooling ...

Research paper thumbnail of Measuring the particle size of a known distribution using the focused beam reflectance measurement technique

Chemical Engineering Science, 2008

Research paper thumbnail of Stochastic Spectral Dynamics of Single Semiflexible Filaments in Shear Flow

We develop a model of single semiflexible biopolymers in shear flow including stochastic (thermal... more We develop a model of single semiflexible biopolymers in shear flow including stochastic (thermal) forcing which is perturbative in (length)/(persistence length). The appropriate eigenfunctions are used to reduce the nonlinear stochastic partial differential equation to a high-dimensional stochastic dynamical system. The decomposition chosen gives a natural separation between slow and fast bending modes such that even a two- or three-

Research paper thumbnail of Buckling instability of dilute semiflexible rods in shear flow: effects on conformational and rheological properties

We have studied the dynamics of worm-like polymers in dilute solutions under shear flow and the e... more We have studied the dynamics of worm-like polymers in dilute solutions under shear flow and the effects on conformational and material properties of the two relevant dimensionless numbers, the ratio between contour length L and persistence length L_p, and the product of shear rate and relaxation time--the Weissenberg number Wi = dotgamma tau. We focus on chains with L /

Research paper thumbnail of The stochastic spectral dynamics of bending and tumbling

Research paper thumbnail of The propagation of pressure in a gelled waxy oil pipeline as studied by particle imaging velocimetry

AIChE Journal, 2012

ABSTRACT Paraffinic crude oils in pipelines may form waxy gels during flow shutdowns. These gels ... more ABSTRACT Paraffinic crude oils in pipelines may form waxy gels during flow shutdowns. These gels can be dislodged by applying pressure if the wall shear stress, proportional to the local pressure gradient, exceeds the gel yield stress. The simplest models assume that the axial pressure profile becomes linear immediately after a jump in upstream pressure, but this fails to account for gel time-dependent rheology or the effect of gel voids on pressure wave propagation. To investigate the former factor, pressure profile and particle imaging velocimetry (PIV) measurements were performed on a model oil gelled under pressure to reduce void formation. After a jump in upstream pressure to a value insufficient to restart flow, the axial pressure profile becomes linear in a two-step process, with an immediate small rise in downstream pressure followed by a time-delayed jump. The local downstream gel deformation measured by PIV exhibits similar two-step time dependence. © 2011 American Institute of Chemical Engineers AIChE J, 2012

Research paper thumbnail of Nuclear Magnetic Resonance Analysis of Methane Hydrate Formation in Water-in-Oil Emulsions

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