29 citations · 87 across the 12 of their papers we have counts for
12 papers
A comprehensive Darcy-type law for viscoplastic fluids: II. Rheology & topology
Emad Chaparian
We extend our recently proposed framework (Chaparian, Phys. Rev. Fluids 10(9) 093301, 2025) for deriving a Darcy-type law governing viscoplastic flows through porous media to incor…
A comprehensive Darcy-type law for viscoplastic fluids: I. Framework
Emad Chaparian
A comprehensive Darcy-type law for viscoplastic fluids is proposed. Different regimes of yield-stress fluid flow in porous media can be categorised based on the Bingham number (i.e…
Yielding to percolation: a universal scale
Emad Chaparian
A theoretical and computational study analysing the initiation of yield-stress fluids percolation in porous media is presented. Yield-stress fluid flows through porous media are co…
General hydrodynamic features of elastoviscoplastic fluid flows through randomised porous media
Saeed Parvar, Emad Chaparian, Outi Tammisola
A numerical study of yield-stress fluids flowing in porous media is presented. The porous media is randomly constructed by non-overlapping mono-dispersed circular obstacles. Two cl…
Squeeze cementing of micro-annuli: a visco-plastic invasion flow
Mahdi Izadi, Emad Chaparian, Elizabeth Trudel +1
Squeeze cementing is a process used to repair leaking oil and gas wells, in which a cement slurry is driven under pressure to fill an uneven leakage channel. This results in a Hele…
Atypical plug formation in internal elastoviscoplastic fluid flows over a non-smooth topology
Miguel E. Villalba, Masoud Daneshi, Emad Chaparian +1
An experimental and computational investigation of the internal flow of elastoviscoplastic fluids over non-smooth topologies is presented in two complimentary studies. In the first…
Computational Rheometry of Yielding and Viscoplastic Flow in Vane-and-Cup Rheometer Fixtures
Emad Chaparian, Crystal E. Owens, Gareth H. McKinley
A planar two-dimensional computational analysis is presented to qualify traditional and fractal vane-in-cup geometries for accurate rheometry of simple viscoplastic fluids with and…
Flow onset for a single bubble in yield-stress fluids
Ali Pourzahedi, Emad Chaparian, Ali Roustaei +1
We use computational methods to determine the minimal yield-stress required in order to hold static a buoyant bubble in a yield-stress liquid. The static limit is governed by the b…
Bubble clouds in viscoplastic fluids
Emad Chaparian, Ian A. Frigaard
Viscoplastic fluids can hold bubbles/particles stationary by balancing the buoyancy stress with the yield stress. In the present study, we investigate a suspension of bubbles in a…
The first open channel for a yield-stress fluid in complex porous media
Dimitrios Fraggedakis, Emad Chaparian, Outi Tammisola
The prediction of the first fluidized path of a yield-stress fluid in complex porous media is a challenging yet an important task to understand the fundamentals of fluid flow in se…
Complex sliding flows of yield-stress fluids
Emad Chaparian, Outi Tammisola
A theoretical and numerical study of complex sliding flows of yield-stress fluids is presented. Yield-stress fluids are known to slide over solid surfaces if the tangential stress…
Computing the Yield Limit in Three-dimensional Flows of a Yield Stress Fluid About a Settling Particle
José A. Iglesias, Gwenael Mercier, Emad Chaparian +1
Calculating the yield limit (the critical ratio of the yield stress to the driving stress), of a viscoplastic fluid flow is a challenging problem, often needing iteration in…