Grants per year
Personal profile
Research Interests
Current topics of interest include investigations of a broad class of problems where there is a competition between order and disorder, such as in mixing and segregation of granular matter or fluid mixing and, more generally, problems in the realm of complex systems involving tools such as agent-based models and network theory.
The interest in basic understanding of mixing lies in the ubiquity of mixing processes in technology and nature; examples are found in chemical, mechanical, and aeronautical engineering, but also in geophysics, physiology, oceanography, polymer engineering, and environmental sciences.
The work in granular dynamics involves a blend of theory, computations, and experimental work that reaches into applications. While important to a wide range of industries, our understanding of solid mixing and segregation is primitive. Some key questions we are currently addressing are: What features of mixing can be predicted computationally? What causes demixing and how it interplays with mixing? How can mixing be optimized?
Education/Academic qualification
Chemical Engineering, PhD, University of Minnesota
… → 1979
Chemical Engineering, Diploma, National University of La Plata, Argentina
… → 1974
Research interests
- Complex systems
- dynamics of granular matter
- mixing and segregation processes
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Grants
GOALI: Flow driven segregation at the particle level
Lueptow, R. M., Ottino, J. M. & Umbanhowar, P.
10/1/19 → 9/30/22
Project: Research project
UNS: Controlling mixing and segregation of granular media using unsteady flows
Lueptow, R. M., Ottino, J. M. & Umbanhowar, P.
7/1/15 → 6/30/20
Project: Research project
Cutting and Shuffling: A New Dynamical Systems Paradigm for Mixing
Lueptow, R. M., Ottino, J. M. & Umbanhowar, P.
9/1/14 → 8/31/18
Project: Research project
REU Supplement for DynSyst_Special_Topics: A Dynamical Systems Approach to Mixing and Segregation of Granular Matter
Lueptow, R. M. & Ottino, J. M.
5/21/13 → 7/31/14
Project: Research project
DynSyst_Special_Topics: A Dynamical Systems Approach to Mixing and Segregation of Granular Matter
Lueptow, R. M. & Ottino, J. M.
8/15/10 → 7/31/14
Project: Research project
Research Output
Axisymmetric granular flow on a bounded conical heap: Kinematics and size segregation
Isner, A. B., Umbanhowar, P. B., Ottino, J. M. & Lueptow, R. M., May 18 2020, In : Chemical Engineering Science. 217, 115505.Research output: Contribution to journal › Article
Granular flow in a wedge-shaped heap: Velocity field, kinematic scalings, and segregation
Isner, A. B., Umbanhowar, P. B., Ottino, J. M. & Lueptow, R. M., Jan 1 2020, (Accepted/In press) In : AIChE Journal. e16912.Research output: Contribution to journal › Article
1
Scopus
citations
Identifying invariant ergodic subsets and barriers to mixing by cutting and shuffling: Study in a birotated hemisphere
Lynn, T. F., Ottino, J. M., Umbanhowar, P. B. & Lueptow, R. M., Jan 10 2020, In : Physical Review E. 101, 1, 012204.Research output: Contribution to journal › Article
Cutting and shuffling a hemisphere: Nonorthogonal axes
Lynn, T. F., Smith, L. D., Ottino, J. M., Umbanhowar, P. B. & Lueptow, R. M., Mar 7 2019, In : Physical Review E. 99, 3, 032204.Research output: Contribution to journal › Article
2
Scopus
citations
Diffusion, mixing, and segregation in confined granular flows
Fry, A. M., Umbanhowar, P. B., Ottino, J. M. & Lueptow, R. M., Mar 2019, In : AIChE Journal. 65, 3, p. 875-881 7 p.Research output: Contribution to journal › Article
3
Scopus
citations