Imperial College London

Professor Omar K. Matar

Faculty of EngineeringDepartment of Chemical Engineering

Vice-Dean (Education), Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 9618o.matar Website

 
 
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Assistant

 

Miss Nazma Mojid +44 (0)20 7594 3918

 
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Location

 

506ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

265 results found

Warner MRE, Craster RV, Matar OK, 2002, Dewetting of ultrathin surfactant-covered films, PHYSICS OF FLUIDS, Vol: 14, Pages: 4040-4054, ISSN: 1070-6631

Journal article

Matar OK, Craster RV, Warner MRE, 2002, Surfactant transport on highly viscous surface films, JOURNAL OF FLUID MECHANICS, Vol: 466, Pages: 85-111, ISSN: 0022-1120

Journal article

Kumar S, Matar OK, 2002, Instability of long-wavelength disturbances on gravity-modulated surfactant-covered thin liquid layers, JOURNAL OF FLUID MECHANICS, Vol: 466, Pages: 249-258, ISSN: 0022-1120

Journal article

Yeo LY, Matar OK, Perez de Ortiz ES, Hewitt GFet al., 2002, A description of phase inversion behaviour in agitated liquid-liquid dispersions under the influence of the Marangoni effect, CHEMICAL ENGINEERING SCIENCE, Vol: 57, Pages: 3505-3520, ISSN: 0009-2509

Journal article

Zhang YL, Matar OK, Craster RV, 2002, Surfactant spreading on a thin weakly viscoelastic film, JOURNAL OF NON-NEWTONIAN FLUID MECHANICS, Vol: 105, Pages: 53-78, ISSN: 0377-0257

Journal article

Warner MRE, Craster RV, Matar OK, 2002, Unstable van der Waals driven line rupture in Marangoni driven thin viscous films, PHYSICS OF FLUIDS, Vol: 14, Pages: 1642-1654, ISSN: 1070-6631

Journal article

Yeo LY, Matar OK, de Ortiz ESP, Hewitt GFet al., 2002, Simulation studies of phase inversion in agitated vessels using a Monte Carlo technique, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 248, Pages: 443-454, ISSN: 0021-9797

Journal article

Mietus WGP, Matar OK, Lawrence CJ, Briscoe BJet al., 2002, Droplet deformation in confined shear and extensional flow, CHEMICAL ENGINEERING SCIENCE, Vol: 57, Pages: 1217-1230, ISSN: 0009-2509

Journal article

Craster RV, Matar OK, Papageorgiou DT, 2002, Pinchoff and satellite formation in surfactant covered viscous threads, PHYSICS OF FLUIDS, Vol: 14, Pages: 1364-1376, ISSN: 1070-6631

Journal article

Yeo LY, Matar OK, de Ortiz ESP, Hewitt GFet al., 2002, A simple predictive tool for modelling phase inversion in liquid-liquid dispersions, CHEMICAL ENGINEERING SCIENCE, Vol: 57, Pages: 1069-1072, ISSN: 0009-2509

Journal article

Valluri P, Matar OK, Mendes MA, Hewitt GF, Valluri P, Matar OK, Mendes MA, Hewitt GFet al., 2002, Modelling hydrodynamics and mass transfer in structured packings (A review), Multiphase Science & Technology, Vol: 14, Pages: 303-348, ISSN: 0276-1459

Journal article

Valluri P, Matar OK, Mendes MA, Hewitt GFet al., 2002, Modelling hydrodynamics and mass transfer in structured packings (A review), Multiphase Science & Technology, Vol: 14, Pages: 303-348, ISSN: 0276-1459

Journal article

Yeo LY, Matar OK, de Ortiz ESP, Hewitt GFet al., 2001, The dynamics of Marangoni-driven local film drainage between two drops, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 241, Pages: 233-247, ISSN: 0021-9797

Journal article

Matar OK, Craster RV, 2001, Models for Marangoni drying, PHYSICS OF FLUIDS, Vol: 13, Pages: 1869-1883, ISSN: 1070-6631

Journal article

Mietus WGP, Matar OK, Seevaratnam G, Wong A, Briscoe BJ, Lawrence CJet al., 2001, Couette flow of two immiscible liquids between two concentric cylinders: The formation of toroidal drops and liquid sheaths, PHYSICAL REVIEW LETTERS, Vol: 86, Pages: 1211-1214, ISSN: 0031-9007

Journal article

Yeo LY, Matar OK, de Ortiz SP, Hewitt GFet al., 2001, Predicting phase inversion behaviour using a Monte Carlo technique, 2nd International Symposium on Multi-Phase Flow and Transport Phenomena, Publisher: BEGELL HOUSE, INC, Pages: 144-151

Conference paper

Craster RV, Matar OK, 2000, The role of dynamic modulation in the stability of viscoelastic flow down an inclined plane, Journal of Fluid Mechanics, Vol: 425, Pages: 213-233, ISSN: 0022-1120

In this study we have theoretically investigated the effect of parallel superposition of modulation on the stability of single-layer Newtonian and viscoelastic flows down an inclined plane. Specifically, a specifically, a spectrally based numerical technique in conjunction with Floquet theory has been used to investigate the linear stability of this class of flows. Based on these analyses we have demonstrated that parallel superposition of modulation can be used to stabilize or destabilize flow of Newtonian and viscoelastic fluids down an inclined plane. In general at low Reynolds number Re (i.e. O(1)) and in the limit of long and O(1) waves the effect of dynamic modulation on the stability of viscoelastic flows is much more pronounced; however, relatively large modulation amplitudes are required to achieve significant stabilization/destabilization. In addition, the dependence of the most dominant modulation frequencies on Re and the Weissenberg number We have been identified. Specifically, it has been shown that for Newtonian flows low-frequency modulations are destabilizing and the most dominant modulation frequency scales with 1/Re. On the other hand, for viscoelastic flows in the absence of fluid inertia low-frequency modulations are stabilizing and the most dominant modulation frequency scales with 1/We. In finite-Re viscoelastic flows the most dominant destabilizing modulation frequency scales with 1/Re while the most stabilizing modulation frequency scales with 1/WeRe. Finally, it has been demonstrated that the mechanism of both purely elastic and inertial instabilities in flows down an inclined plane is unchanged in the presence of dynamic modulation.

Journal article

Craster RV, Matar OK, Craster RV, 2000, Surfactant transport on mucus films, Journal of Fluid Mechanics, Vol: 425, Pages: 235-258

Journal article

Yeo LY, Matar OK, Perez de Ortiz ES, Hewitt GFet al., 2000, Phase inversion and associated phenomena, Multiphase Science and Technology, Vol: 12, Pages: 51-116

Journal article

Matar OK, Troian SM, 1999, The development of transient fingering patterns during the spreading of surfactant coated films, PHYSICS OF FLUIDS, Vol: 11, Pages: 3232-3246, ISSN: 1070-6631

Journal article

Matar OK, Troian SM, 1999, Spreading of a surfactant monolayer on a thin liquid film: Onset and evolution of digitated structures, Chaos, Vol: 9, Pages: 141-153

Journal article

Matar OK, Troian SM, 1998, Growth of non-modal transient structures during the spreading of surfactant coated films, Physics of Fluids, Vol: 10, Pages: 1234-1236

Journal article

Matar OK, Troian SM, 1997, Dynamics and stability of surfactant coated thin spreading films, Symposium on Dynamics in Small Confining Systems, at the 1996 MRS Fall Meeting, Publisher: MATERIALS RESEARCH SOCIETY, Pages: 237-242, ISSN: 0272-9172

Conference paper

Matar OK, Troian SM, 1997, Linear stability analysis of an insoluble surfactant monolayer spreading on a thin liquid film, Physics of Fluids, Vol: 9, Pages: 3645-3657

Journal article

Ripple D, Matar O, 1993, Viscosity of the saturated liquid-phase of 6 halogenated compounds and 3 mixtures, Journal of Chemical and Engineering Data, Vol: 38, Pages: 560-564

Journal article

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