Publications of Dr. Andrew Hrymak


S. Liu, A. N. Hrymak and Philip E. Wood, Design Modifications to SMX Static Mixer for Improving Mixing, AIChE Journal, 52, 150-157 (2006)

S. Liu, A.N. Hrymak and P.E. Wood, Laminar Mixing of Shear Thinning Fluids in a SMX Static Mixer, Chemical Engineering Science, 61, 1753-1759 (2006)

S. Liu, A.N. Hrymak, and Philip E. Wood, Drop Breakup in an SMX Static Mixer in Laminar Flow, Canadian Journal of Chemical Engineering, 83, 793-807 (2005)

V.L. Bravo, A.N. Hrymak, J.D. Wright, “Study of Particle trajectories, residence times and flow behaviour in kneading discs of intermeshing co-rotating twin-screw extruders”, Polymer Engineering and Science, 44, 779-793 (2004).

S. Jaffer, V.L. Bravo, P.E. Wood, A.N. Hrymak, and J.D. Wright, "Experimental validation of numerical simulations of the kneading disc section in a twin screw extruder", Poly. Eng. Sci., 40, 892-901, (2000).

V.L. Bravo, A.N. Hrymak and J.D Wright, "Numerical simulation of pressure and velocity profiles in mixing elements of a co-rotating twin screw extruder", submitted to Poly. Eng. Sci., 40, 525-541, (2000).

D.A. Johnson, P.E. Wood and A.N. Hrymak, "The effect of geometrical parameters on the flow field of an opposed jet RIM mix head: equal flow and matched fluids", Canadian Journal of Chemical Engineering, 74, 40-48, (1995).

M.R. Thompson, J.P. Puaux, A.N. Hrymak, and A.E. Hamielec, "Modeling the Residence Time Distribution of a Non-Intermeshing Twin-Screw Extruder", International Polymer Processing. 10, 111-119, (1995).

R. Yeo, P.E. Wood, and A.N. Hrymak, "A Numerical Study of Laminar 90 Degree Bend Duct Flow with Different Discretization Schemes", ASME Journal of Fluids Engineering, 113, pp 563-568, (1991).

P. Wood, A. Hrymak, R. Yeo, D. Johnson, and A. Tyagi, "Experimental and Computational Studies of the Fluid Mechanics in an Opposed Jet Mixing Head", Physics of Fluids A, 5, pp 1362-1368, (1991).


H.J. Larrazabal, A.N. Hrymak and J. Vlachopoulos, On the relationship between the work of adhesion and the critical shear stress for the onset of flow instabilities, Rheologica Acta, 45, 705-715 (2006).

H.J. Larrazabal, Hrymak, A.N., Vlachopoulos, J., “Effect of the chemical and morpohological conditions of the die wall on the extrusion of linear polyolefins”, Int Polym Proc, 21, 132-140, (2006)

Torres, A.N. Hrymak and J. Vlachopoulos, “Fast and efficient simulation of 3D creeping flow in ducts using a space-time marching algorithm”, Polymer Engineering and Science, 45, 249-259 (2005).

H.J. Larrazabal, A.N. Hrymak, J.Vlachopoulos, “Flow instabilities of linear PE in capillary dies – materials of construction of dies”, International Polymer Processing, 17, 44-48 (2002)

S.D. Taylor and A.N. Hrymak, "Visualization and Flow Simulation of a Two-Layer Slot Coater", Chemical Engineering Science, 54, 909-918, (1999).

A.J. Rincon, A.N. Hrymak, J. Vlachopoulos, "Transient Finite Element Analysis of Generalized Newtonian Coextrusion Flows in Complex Geometries", International Journal for Numerical Methods in Fluids, 29, 1151-1189, (1998).

A.N. Hrymak and J. Vlachopoulos, "Simulation of coextrusion flows of polymer melts: a review", Invited submission to Seikei Kakou (Japanese), 10, 695-705. Invited review, (1998).

Torres, A.N. Hrymak, J. Vlachopoulos, J. Dooley, B. Hilton, "Boundary conditions for contact lines in coextrusion flows". Rheologica Acta, 32, 513-525, 1993. Errata, 33, 241, (1994).

Karagiannis, A.N. Hrymak, and J. Vlachopoulos, "Three Dimensional Studies on Bicomponent Extrusion", Rheologica Acta, 29, pp 71-87, (1990).

Karagiannis, A.N. Hrymak, and J. Vlachopoulos, "Three Dimensional Non-Isothermal Extrusion Flows", Rheologica Acta, 28, pp 121-133, (1989).

Karagiannis, H. Mavridis, A.N. Hrymak, J. Vlachopoulos, "Interface Determination in Bicomponent Extrusion", Polymer Engineering and Science, 28, 982-988, (1988).

Karagiannis, A.N. Hrymak, and J. Vlachopoulos, "Three Dimensional Extrudate Swell of Creeping Newtonian Jets", AIChE Journal, 34, pp 2088-2094, (1988).



L. Gu, S. Zhu and A.N. Hrymak, "Acidic and Basic Hydrolysis of Poly(N-vinylformamide)", J. Applied Polymer Science, 86, 3412-3410, (2002).

L. Gu, S. Zhu and A.N. Hrymak, "Synthesis and Flocculation Performance of Graft Copolymer of N-vinylformamide and polymdimethylaminoethyl methacrylate Methyl Chloride Macromonomer", Colloid and Interfacial Science. 280, 167-175 (2002).

L. Gu, S. Zhu*, A.N. Hrymak, R.H. Pelton "Nature of Poly(N-vinylformamide) Gel Formed in Free Radical Polymerization of N-vinylformamide", Macromol. Rapid Commun., 22, 212-214 ,(2001).

L. Gu, S. Zhu*, A.N. Hrymak, R.H. Pelton "Kinetics and Modelling of Free Radical Polymerization of N-Vinylformamide", Polymer, 42, 3077-3086, (2001).

J. Liu, R. Pelton, A.N. Hrymak, "Properties of poly(N-isopropylacrylamide) grafted colloidal silica", J. Colloid and Interface Sci., 227, 408-411, (2000).

R. Subramanian, Y.H. Huang, S. Zhu, A.N. Hrymak and R.H. Pelton, "ESR Studies and Reactive Extrusion of Polyacrylamide and Polydiallyldimethylammoniumchloride with peroxide", J. Appl. Polym. Sci., 77, 1154-1164, (2000).

L. Gu, A.N. Hrymak and S. Zhu, "Grafting of polyelectrolytes onto polyacrylamide by reactive processing, J. Applied Polymer Science, 74, 1412-1416, (1999).

L. Gu, S. Zhu, and A.N. Hrymak, "Modeling Molecular Weight Distribution of Comb Branched Graft Polymers" J. Polymer Science - Polymer Physics, 36, 704-714, (1998).

M.R. Thompson, A.N. Hrymak, and A.E. Hamielec, "Modeling the Reactive Modification of HDPE in a Non-Intermeshing Twin-Screw Extruder", Advances in Polymer Technology, 14, 87-96, (1995).

V.J. Triacca, P.E. Gloor, S. Zhu, A.N. Hrymak and A.E. Hamielec, "Free Radical Degradation of Polypropylene: Random Chain Scission", Polymer Engineering and Science, 33, pp 445-454, (1993).

Maier, A.N. Hrymak, and P.E. Wood, "Knit Lines in Reaction Injection Molding", Advances in Polymer Technology, 10, pp 61-74, (1990).



H. Mavridis, A.N. Hrymak, and J. Vlachopoulos, "The Effect of Fountain Flow on Molecular Orientation in Injection Molding", Journal of Rheology, 32, pp 639-663, (1988).

H. Mavridis, A.N. Hrymak, J. Vlachopoulos, "Transient Free Surface Flows in Injection Molding", AIChE Journal, 34, pp 403-410, (1988).

H. Mavridis, A.N. Hrymak, J. Vlachopoulos, "Finite Element Simulation of Stratified Multi-Phase Flows", AIChE Journal, 33, pp 410-422, (1987).

H. Mavridis, A.N. Hrymak, J. Vlachopoulos, "Mathematical Modelling of Injection Mold Filling: A Review", Advances in Polymer Technology, 6, pp 457-466, (1986).

H. Mavridis, A.N. Hrymak, J.Vlachopoulos, "Deformation and Orientation of Fluid Elements Behind an Advancing Front", Journal of Rheology, 30, pp 555?563, (1986).

H. Mavridis, A.N. Hrymak, J.Vlachopoulos, "Finite Element Simulation of Fountain Flow in Injection Molding", Polymer Engineering and Science, 26, pp 449?454, (1986).



X. Qin, M.R. Thompson, A.N. Hrymak, A. Torres, “Rheological Comparison Of Chemical And Physical Blowing Agents In A Thermoplastic Polyolefin”, IEC Research, 45, 2734-2740 (2006).

M.R. Thompson, M.R., X. Qin, G.Zhang and A.N. Hrymak, “Aspects of Foaming a Glass-Reinforced Polypropylene with Chemical Blowing Agents”, J. App Poly Sci, 102, 4696-4706 (2006)

X. Qin, M.R. Thompson and A.N. Hrymak, “Rheology studies of polyethylene/chemical blowing agent solutions within an injection molding machine”, Polymer Engineering and Science, 45, 1108-1118 (2005).

V.L. Bravo and A.N. Hrymak, “Nozzle injection of physical blowing agents in the injection molding of microcellular foams”, International Polymer Processing, 20, 149-156 (2005).

M. Rodic and A.N. Hrymak*, "The modified imbedded disk retraction method for measurement of interfacial tension in polymer melts", submitted to Rheologica Acta, 40, 339-348, (2001)

M.W. Woo, P. Wong, Y. Tang, V. Triacca, P.E. Gloor, A.N. Hrymak and A.E. Hamielec, "Melting Behavior and thermal properties of HDPE", Polymer Engineering and Science, 35, 151-156, (1995).

M. Corak, M. Van De Wiele, R. Pelton and A. Hrymak, "Polystyrene latex deposition onto polyethylene film consecutively treated with cationic and anionic polymer", Colloids and Surfaces A. 90, 203-211, (1994).

J.P. Bareman, R.I. Reid, A.N. Hrymak and T.A. Kavassalis, "Estimation of Solvent Diffusion Coefficients Using Molecular Dynamics Simulations", Molecular Simulation, 11, 243-250, (1993).

Karagiannis, H. Mavridis, A.N. Hrymak, J. Vlachopoulos, "A Finite Element Convergence Study for Shear Thinning Flow Problems", International Journal for Numerical Methods in Fluids, 8, pp 123-138, (1988).

J. Vlachopoulos, and A.N. Hrymak, "Calendering Poly(Vinyl Chloride): Theory and Experiments", Polymer Engineering and Science, 20, pp. 725?731, (1980).



J. Wang, A.N. Hrymak. R. Pelton, ", Specific Surface and Effective Volume of Water Swollen Pulp Fibers by a Permeability Method, J.Pulp and Paper Science, 28, 13-16 (2002)

J. Wang, A.N. Hrymak and R.H. Pelton, "Compressible porous and fibrous beds formed from dilute pulp suspensions", IEC Research, 41, 572-578 (2002)

J. Wang, R. Pelton*, Andrew N. Hrymak and Yongmoon Kwon, "New insights into dispersed air effects in brownstock washing", Tappi, 84 (1), 101 (2001).

G. Wang, R. Pelton, A.N. Hrymak, N. Shawafaty, Y.M. Heng, "On the role of hydrophobic particles and surfactants in defoaming", Langmuir, 15, 2202-2208, (1999).

D. De, A.N. Hrymak and R. Pelton, "A Network of Zones Model for Reactive Polymer Enhanced Miscible Displacement in a Porous Cylinder", Chemical Engineering Science, 53, 3545-3559, (1998).

D. De, A.N. Hrymak and R. Pelton, "Polyelectrolyte Precipitate Formation During Miscible Displacement in Porous Media', AIChE Journal, 43, pp 2415-2423, (1997).

R.E. Lappan, A.N. Hrymak and R. Pelton, "Dependence of in situ precipitate deposition on flow characteristics in multi-permeability porous media", Chemical Engineering Science, 52, pp 2963-2975, (1997).

R.E. Lappan, R. Pelton, I. McLennan, J. Patry and A.N. Hrymak, “Kraft Lignin-PolyDADMAC Precipitate Formation”. Industrial and Engineering Chemistry Research, 36, 1171-1175, (1997).

R.E. Lappan, A.N. Hrymak and R. Pelton, "Polymer Enhanced Brown Stock Washing: Mill Trial", TAPPI J., 79, 170-178, (1996).



S.D. Moon and A.N. Hrymak, "Scheduling of the Batch Annealing Process - Deterministic Case", Computers and Chemical Engineering, 23, 1193-1208, (1999).

S.D. Moon and A.N. Hrymak, "A novel MILP model for short term scheduling of a special class of multipurpose batch plants", IEC Research, 38, 2144, (1999). (Research Note)

P. Seferlis and A.N. Hrymak, "Sensitivity Analysis for Chemical Process Optimization", Computer and Chemical Engineering, 20, 1177-1200, (1996).

Mizoguchi, T.E. Marlin and A.N. Hrymak, "Operations Optimization and Control Design for a Petroleum Distillation Process", Canadian Journal of Chemical Engineering, 73, 896-907, (1995).

P. Seferlis, A.N. Hrymak, "Adaptive collocation on finite element models for the optimization of multi-stage distillation units", Chemical Engineering Science. 49, 1369-1382, (1994).

P. Seferlis, A.N. Hrymak, "Optimization of Distillation Units Using Collocation Models", AIChE Journal, 40, 813-825, (1994).

J.K. Bailey, A.N. Hrymak, S.S. Treiber, and R.B. Hawkins, "Nonlinear Optimization of a Hydrocracker Fractionation Plant", Computers and Chemical Engineering, 17, pp 123-138, (1993).

A.N. Hrymak, A.W. Westerberg, "Computational Considerations for Moving Finite Element Methods", Chemical Engineering Science, 41, pp 1673?1680, (1986).

A.N. Hrymak, G.J. McRae, A.W. Westerberg, "An Implementation of a Moving Finite Element Method", Journal of Computational Physics, 63, pp 168?190, (1986).

A.N.Hrymak, G.J.McRae, A.W.Westerberg, "Combined Analysis and Optimization of Extended Heat Transfer Surfaces", Journal of Heat Transfer, 107, pp 527?532, (1985).

C.M. Crowe, Y.A. Garcia Campos, and A.N. Hrymak, "Reconciliation of Process Flow Rates by Matrix Projection", AIChE Journal, 29, pp. 881?888, (1983).



D.R. Woods, A.N. Hrymak, R.R. Marshall et al, "Developing Problem Solving Skills: the McMaster Problem Solving Program", Journal of Engineering Education, April, 75-91, 1996. {Winner of the Wickendon Award of the ASEE, 1998}

Woods, D.R., W.C. Duncan-Hewitt, F.A. Hall, C.H. Eyles and A.N. Hrymak, "Tutored versus Tutorless Groups in Problem-Based Learning", American Journal Pharmaceutical Education, 60, 231-238, (1996).

D.R. Woods, R.R. Marshall, A.N. Hrymak, "Self-Assessment in the Context of the McMaster Problem Solving Program", Assessment and Evaluation in Higher Education, 13, no. 2, pp 107-127, (1988).



M.Eng. / M.A.Sc.

Hector Marquez-Lona, (co-supervisor M.R. Thompson) “Extrusion foaming of branched, random copolymer and homopolymer polypropylene”

Xuecheng Huang, “Properties of thermoplastic starch/poly(lactic acid) blends”

Patrick Diebel, “Properties of Flexible PVC Film produced on prototype equipment and production calendaring equipment”

Laure Saunier, “Flow of dispersions in coating die geometries”

Mirna Robles,(co-supervisor J. Vlachopoulos) “Water debinding in powder injection molding”

Ma Ronglin, {co-supervisor P.E. Wood), “Studies of the flow fields and mixing performance in a twin-screw extruder”

Jean-Francois Dube, (co-supervisor T.E. Marlin), “Scheduling of Pulp Mills”.

Warren Reynolds, (co-supervisor M. Elbestawi), "Optimization of cooling circuits in injection molding"

Neil Smith, "Melting behaviour of polyethylenes synthesized with a constrained geometry catalyst".

Shiping Liu, (co-supervisor P.E. Wood), "Laminar Mixing in Kenics Type Static Mixers".

Hector Larrazabal, "Flow instabilities of linear polyethylenes in capillary dies".

Willard Martin, (co-supervisor H. Mahabadi), "A Kinetic Study of the Crosslinking of unsaturated polyesters in the absence of vinyl monomers".

Dominic Sinopoli, (co-supervisor P.E. Wood), "The onset of flow in an impingement mixing chamber".

Chunliang Zhang, (co-supervisor C.M. Crowe) "Simultaneous Data Reconciliation and Parameter Estimation in Real-time Optimization".

Shawn Taylor, "Two Layer Slot Coating: Study of Die Geometry and Interfacial Region"

Heather Wright, “Structural Reaction Injection Molding: Rheology and Kinetics”

John Brydges, (co-supervisor T.E. Marlin), “Issues in Real Time Optimization: The gas and liquid Recovery Section of a Fluidized Catalytic Cracking Unit”

Michael Kempe, (co-supervisor R.H. Pelton), "Dynamic Model of Pulp Washers"

Bruce Watson, (co-supervisor G. Patry), "Examination of Dynamic Rectangular Secondary Clarifier Models"

Michael Thompson, (co-supervisor A.E. Hamielec), "Simultaneous Scission and Cross-linking of HDPE in a Twin Screw Extruder"

Tamara McCaw, (co-supervisor T. Marlin), "Two Layer Optimization of a Catalytic Reformer"

Andrew Ho, (co-supervisor P.E. Wood),"Impingement Mixing for reaction injection molding"

W. Bradley MacDonald, (co-supervisor S. Treiber), "Interior Point Algorithms for Refinery Scheduling Problems"

Atsushi Mizoguchi, (co-supervisor T. Marlin), "The Effect of Control Structure on Real-time Optimization"

Geoffrey McIlwraith, (co-supervisor P.A. Taylor), "An Expert System for Control of a Thermomechanical Pulp Refining System"

Kirk Bailey, (co-supervisor S. Treiber), "Nonlinear Optimization of a Hydrocracker Fractionation Plant"

Chris Maier, (co-supervisor P.E. Wood), “Knit Lines in Reaction Injection Moldings"

Ian Moore, "Synthesis of Energy Integrated Distillation Sequences"


PhD Completed

Xiaonan Qin (co-supervisor M.R. Thompson) “In-Line Rheology And Physical Properties Of Thermoplastic Foam”

Shiping Liu, (co-supervisor P.E. Wood)”Laminar Mixing in an SMX Static Mixer”

Hector Larrazabal, (co-supervisor J. Vlachopoulos) “Effects of the die wall conditions on the extrusion of linear polyolefins”

Jinsong Wang, (co-supervisor R. Pelton), Experiments and Modeling of Pulp Mat Formation.

Leming Gu, (co-supervisor S. Zhu), “Free Radical Polymerization of N-PVF”.

Farhad Sharif, (co-supervisor J. Vlachopoulos), "3-D Finite Element Analysis of Viscoelastic Flow".

Alberto Rincon, (co-supervisor J. Vlachopoulos), "Transient Simulation of Non-Newtonian Coextrusion Flows in Complex Geometries".

Victor Bravo, (co-supervisor J.D. Wright), "Finite Element Simulation of Flow in Twin Screw Extruders".

Ashok Tyagi, (co-supervisor P.E. Wood), "Jet to Jet Impingement in a Confined Space"

Agustin Torres, (co-supervisor J. Vlachopoulos), "Finite Element Analysis of Layer Non-Uniformity in Coextrusion Flows"

Panageotis Serferlis, "Collocation Models for Distillation Units and Sensitivity Analysis Studies in Process Optimization"

Ronald Yeo, (co-supervisor P.E. Wood), "A Numerical Study of Jet-to-Jet Impingement In a Mixing Head"

Aristotelis Karagiannis, (co-supervisor J. Vlachopoulos), "Modelling of Single Component and Bicomponent Extrusion Flows"

Harilaos Mavridis, (co-supervisor J. Vlachopoulos), "Finite Element Studies in Injection Mold Filling"