Dr. Anthony Pearson
J R A Pearson's current research interests are all connected with oilfield problems involving flow in porous media.
- The specification of rheological equations of state for worm-like surfactant fluids, and their detailed parametrisation by comparison with observed flow behaviour. This involves the use of stress measurements on "controlled" flows in rheometers as well as velocimetry measurements for "uncontrolled" flows in more complex geometries. The application sought is to simulation of flow of these fluids in network models for real porous media (reservoir rocks), from which Darcy-scale continuum models models can be derived.
- Phase separation, such as shear banding, in systems with a shear stress "maximum" in uniform steady simple shear flow. This in turn has led to a consideration of mass transfer in non-uniform flow fields, whereby the surfactant, and hence micelle concentration, becomes a function of the deformation rate in a complex flow field. Surprisingly, experimental observations have demonstrated large concentration variations in flow patterns typical of real reservoir flows.
- Comparison of models for dispersion in porous-media flows of multi-phase and complex fluids. The simplest model, and the one currently favoured in reservoir simulation, is a simple diffusive one where the diffusion coefficient is a second rank tensor multiplied by the Darcy viscosity, i.e. linearly proportional to the local Peclet number. However experiments at all scales in real rock flows suggest that diffusion is always "anomalous", and depends on Peclet number in a more elaborate analytical fashion.
- Hammond, PS and Pearson, JRA (2010) Pore-Scale Flow in Surfactant Flooding. TRANSPORT POROUS MED 83 (1): 127-149 Sp. Iss. SI MA
- Pearson, JRA (2009) On a simple model for surfactant-dominated contact-line movement. CHEM ENG SCI 64 (22): 4737-4743 Sp. Iss. SI
- Pearson, JRA and Roberts, GW (2009) Whither Rheology? Some comments following a conference of that name held at Lake Vyrnwy in March 2007 Foreword. J NON-NEWTON FLUID 157 (3): 139-140 Sp. Iss. SI A
- Pearson, JRA (2007) Can conventional continuum mechanics provide adequate simulations for flows of complex fluids?. IND ENG CHEM RES 46 (19): 6133-6139 SEP 12 2007
- Anderson, VJ, Pearson, JRA and Sherwood, JD (2006) Oscillation superimposed on steady shearing: Measurements and predictions for wormlike micellar solutions. J RHEOL 50 (5): 771-796 SEP-OCT 2006
- Tardy, PMJ and Pearson, JRA (2006) A 1D-averaged model for stable and unstable miscible flows in porous media with varying Peclet numbers and aspect ratios. TRANSPORT POROUS MED 62 (2): 205-232 FEB 2006
- Pritchard, D and Pearson, JRA (2006) Viscous fingering of a thixotropic fluid in a porous medium or a narrow fracture. J NON-NEWTON FLUID 135 (2-3): 117-127 MAY 30 2006
- Boek, ES, Padding, JT, Anderson, VJ, Tardy, PMJ, Crawshaw, JP and Pearson, JRA (2005) Constitutive equations for extensional flow of wormlike micelles: stability analysis of the Bautista-Manero model. J NON-NEWTON FLUID 126 (1): 39-46 FEB 20 2005
- Oddie, G and Pearson, JRA (2004) Row-rate measurement in two-phase flow. ANNU REV FLUID MECH 36: 149-172 2004
- Fadili, A, Tardy, PMJ and Pearson, JRA (2002) A 3D filtration law for power-law fluids in heterogeneous porous media. J NON-NEWTON FLUID 106 (2-3): 121-146 SEP 20 2002
- Pearson, JRA and Tardy, PMJ (2002) Models for flow of non-Newtonian and complex fluids through porous media. J NON-NEWTON FLUID 102 (2): 447-473 Sp. Iss. SI F
- Thompson, MJ, Pearson, JRA and Mackley, MR (2001) The effect of droplet extension on the rheology of emulsions of water in alkyd resin. J RHEOL 45 (6): 1341-1358 NOV-DEC 2001
- Hammond, PS, Meredith, AW, Pearson, JRA and Billingham, J (2000) Modelling gas-liquid flow through pipes of variable cross-section. FLUID MEC A 57: 239-249 2000
- Pearson, JRA (1999) Length scales, asymptotics and non-linear singularities. IUTAM SYMPOSIUM ON NON-LINEAR SINGULARITIES IN DEFORMATION AND FLOW, PROCEEDINGS : 1-12 1999
- Pearson, JRA and Ferguson, J (1998) Thoughts old and new on moving contact lines. FLUID MEC A 43: 223-239 1998
- Pearson, JRA (1998) Turbulent gas-liquid flows. PROGRESS AND TRENDS IN RHEOLOGY V : 45-48 1998
- Pearson, JRA (1996) Contact lines moving at high Reynolds number. XIITH INTERNATIONAL CONGRESS ON RHEOLOGY, PROCEEDINGS : 620-620 1996
- PEARSON, JRA (1994) REPORT ON UNIVERSITY-OF-WALES INSTITUTE-OF-NON-NEWTONIAN-FLUID-MECHANICS MINISYMPOSIUM ON CONTINUUM AND MICROSTRUCTURAL MODELING IN COMPUTATIONAL RHEOLOGY - SEIONT-MANOR, GWYNEDD, 11-12-APRIL-1994. J NON-NEWTON FLUID 55 (2): 203-205 NOV 1994
- DESROCHES, J, DETOURNAY, E, LENOACH, B, PAPANASTASIOU, P, PEARSON, JRA, THIERCELIN, M and CHENG, A (1994) THE CRACK-TIP REGION IN HYDRAULIC FRACTURING. P ROY SOC LOND A MAT 447 (1929): 39-48 OCT 8 1994
- PEARSON, JRA (1994) ON SUSPENSION TRANSPORT IN A FRACTURE - FRAMEWORK FOR A GLOBAL-MODEL. J NON-NEWTON FLUID 54: 503-513 AUG 1994
- PEARSON, JRA (1994) FLOW CURVES WITH A MAXIMUM. J RHEOL 38 (2): 309-331 MAR-APR 1994
- PEARSON, JRA (1994) 2-PHASE MODELS FOR COMPLEX FLUID PHENOMENA - SOME EXAMPLES. CHEM ENG SCI 49 (5): 727-732 MAR 1994
- LESAGE, M, HALL, P, PEARSON, JRA and THIERCELIN, MJ (1991) PORE-PRESSURE AND FRACTURE-GRADIENT PREDICTIONS. J PETROL TECHNOL 43 (6): 652-654 JUN 1991
- PEARSON, JRA and SHERWOOD, JD (1988) CONTINUUM MODELING OF CROSS-FLOW FILTRATION. PHYSICOCHEM HYDRODYN 10 (5-6): 647-661 1988
- MOORE, CA and PEARSON, JRA (1975) EXPERIMENTAL INVESTIGATIONS INTO AN ISOTHERMAL SPINNING THREADLINE - EXTENSIONAL RHEOLOGY OF A SEPARAN AP-30 SOLUTION IN GLYCEROL AND WATER. RHEOL ACTA 14 (5): 436-446 1975
- PEARSON, JRA, SHAH, YT and VIEIRA, ESA (1973) STABILITY OF NONISOTHERMAL FLOW IN CHANNELS .1. TEMPERATURE-DEPENDENT NEWTONIAN FLUID WITHOUT HEAT GENERATION. CHEM ENG SCI 28 (11): 2079-2088 1973
- PEARSON, JRA and PICKUP, TJF (1973) STABILITY OF WEDGE AND CHANNEL FLOW OF HIGHLY VISCOUS AND ELASTIC LIQUIDS. POLYMER 14 (5): 209-214 1973