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Afshin Goharzadeh
Researcher at Petroleum Institute
Publications - 59
Citations - 701
Afshin Goharzadeh is an academic researcher from Petroleum Institute. The author has contributed to research in topics: Particle image velocimetry & Asphaltene. The author has an hindex of 10, co-authored 52 publications receiving 565 citations. Previous affiliations of Afshin Goharzadeh include American Petroleum Institute & University of Le Havre.
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Transition layer thickness at a fluid-porous interface
TL;DR: In this paper, the length scale of the transition region between a porous layer and its overlying fluid layer is measured and compared with the permeability and the matrix grain size using particle image velocimetry and refractive index matching.
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Examining Asphaltene Solubility on Deposition in Model Porous Media.
Yu-Jiun Lin,Peng He,Mohammad Tavakkoli,Nevin Thunduvila Mathew,Yap Yit Fatt,John C. Chai,Afshin Goharzadeh,Francisco M. Vargas,Sibani Lisa Biswal +8 more
TL;DR: A study of the dynamics of asphaltene deposition in porous media using microfluidic devices and pore-scale visualization and velocity profiles, as well as three stages of deposition, were examined to determine the important convection-diffusion effects on deposition.
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Characterizing Asphaltene Deposition in the Presence of Chemical Dispersants in Porous Media Micromodels
Yu-Jiun Lin,Peng He,Mohammad Tavakkoli,Nevin Thunduvila Mathew,Yap Yit Fatt,John C. Chai,Afshin Goharzadeh,Francisco M. Vargas,Sibani Lisa Biswal +8 more
TL;DR: In this article, the authors describe the use of porous media microfluidic devices to evaluate how chemical dispersants change asphaltene deposition, and the resulting deposition kinetics are visualized at both the matrix scale and pore scale.
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Experimental characterization of intermittency regimesin the Couette-Taylor system
TL;DR: In this article, the authors investigate the properties of spatio-temporal intermittency states (turbulent bursts and spiral turbulence) in the Couette-Taylor system and show that the mean turbulent fraction increases continuously from turbulent bursts to spiral turbulence and depends on the angular velocity of both cylinders.
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Weak temperature gradient effect on the stability of the circular Couette flow
TL;DR: In this paper, the influence of a weak radial temperature gradient in a wide gap and large aspect ratio Couette-Taylor system was investigated, and it was shown that a radial temperature gradients destabilizes the Couette flow leading to a pattern of traveling helicoidal vortices occurring only near the bottom of the system.