"Cocurrent Downflow of Air and Water in a Two Dimensional Packed Column." AIChE J., 32, 1677, 1986 [with G. Christensen and S. J. McGovern].

"Mathematical Modeling of Pulsing Flow in Large Trickle Beds." AIChE J., 33, 455, 1987.

"Onset of Pulsing in Two-Phase Cocurrent Downflow through a Packed Bed." AIChE J., 34, 1850, 1988 [with K. Grosser and R. G Carbonell].

"A Macroscopic Model for Countercurrent Gas-Liquid Flow in Packed Columns." AIChE J., 35, 1282, 1989 [with D. C. Dakworth].

"Pulsing Flow in Trickle Beds: A Dynamic Model." AIChE J., 36, 605, 1990 [with D. C. Dankworth].

"Time-dependent Hydrodynamics of Multiphase Flow Reactors." Chem. Eng. Sci., 45, 2239, 1990 [with D. C. Dankworth and I. G. Kevrekidis].

"Gas-Particle Flow in CFB Risers." Proceedings of The Fourth International Conference on Circulating Fluidized Beds, 367-372, 1994 [with S. Dasgupta and R. Jackson].

"Gas-Solid Flow in Vertical Tubes." AIChEJ., 17, 1009, 1991 [with J. A. Pita].

"The Effect of Boundaries on Trickle Bed Hydrodynamics." AlChEJ., 37, 1237 , 1991 [with M. J. Szady].

"Time-Dependent Vertical Gas-Liquid Flow in Packed Beds." Chem. Eng. Sci., 47, 337, 1992 [with D. C. Dankworth].

"Infinite Wavelength Analysis for Two-Phase Flow: A Three Parameter Computer-Assisted Study of Global Bifurcations." Physica D, 55, 197 , 1992 [with D. C. Dankworth and I. G. Kevrekidis].

"Stability of Periodic Traveling Waves in Trickle Beds." Chem. Eng. Sci., 47, 3257, 1992 [with D.C. Dankworth].

"Developing Flow of a Gas-Particle Mixture in a Vertical Riser." AlChEJ., 39, 541, 1993 [with J.A. Pita].

"Gas-Particle Flow in a Duct of Arbitrary Inclination with Particle-Particle Interactions." AIChEJ., 39, 1261, 1993 [with R. Ocone and R. Jackson].

"Turbulent Gas-Particle Flow in Vertical Risers." AIChEJ., 40, 215, 1994 [with S. Dasgupta and R. Jackson].

"Liquid Distribution in Trickle Bed Reactors." Energy & Fuels, 8, 532, 1994.

"A Two-Phase Model for Subcooled and Superheated Liquid Jets." in AIChE Symp. Ser. on Modelling and Mitigating the Consequences of Accidental Release of Hazardous Materials, 189, 1995 [with R. Muralidhar, G. R. Jersey, and F. J. Krambeck].

"Instabilities and the Formation of Bubbles in Fluidized Beds." J. Fluid Mech., 303, 327 1995 [with K. G. Anderson and R. Jackson].

"One- and two-Dimensional Traveling wave Solutions in Gas-Fluidized Beds." J. Fluid Mech., 306, 183, 1996 [with B. J. Glasser and I. G. Kevrekidis].

"Stability of Bounded Shear Flow of Granular Materials." J. Fluid Mech., 308, 31, 1996 [with C.-H. Wang and R. Jackson].

"Traveling Waves in Multi-phase Flows." Advances in Fluid Mechanics, 9, 307, 1996 [with M.G. Göz, B.J. Glasser and I.G. Kevrekidis].

"Fully-developed Traveling Wave Solutions and Bubble Formation in Fluidized Beds." Journal of Fluid Mechanics, 334, 157, 1997 [with B.J. Glasser and I.G. Kevrekidis].

"Instabilities of Fully-developed Rapid Flow of Granular Material in a Channel." Journal of Fluid Mechanics, 342, 179, 1997 [with C.-H. Wang and R. Jackson].

"Developing Flow of Gas-Particle Mixtures in Vertical Ducts." Ind. Eng. Chem. Res., 36, 3375, 1997 [with S. Dasgupta and R. Jackson].

"Gas-Particle Flow in Vertical Pipes with High Mass Loading of Particles." Powder Technology, 96, 6, 1998 [with S. Dasgupta and R. Jackson].

"The Growth, Saturation, and Scaling Behaviour of One- and Two-Dimensional Disturbances in Fluidized Beds." Journal of Fluid Mechanics, 362, 83, 1998 [with M.F. Goz].

"From Bubbles to Clusters in Fluidized Beds." Physical Review Letters, 81, 1849, 1998 [with B.J. Glasser and I.G. Kevrekidis].

"Dynamics of Gas-Particle Flow in Circulating Fluidized Beds." Powder Technology, 100, 173, 1998 [with A. Srivastava, K. Agrawal, S.B.R. Karri and T.M.Knowlton].

"Bubble Flow Simulations with the Lattice-Bolztmann Methods." Chemical Engineering Science, 54, 4817, 1999 [with K. Sankaranarayanan, X. Shan and I.G. Kevrekidis].

"The Effect of Boundaries on the Plane Couette Flow of a Granular Material: A Bifurcation Analysis." Journal of Fluid Mechanics, 397, 203, 1999 [with P.R. Nott, M.B. Alam, K. Agrawal, and R. Jackson].