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 Twin Cities
… → 1979
Chemical Engineering, Diploma, National University of La Plata
… → 1974
Research interests
- Complex systems
- dynamics of granular matter
- mixing and segregation processes
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Network
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GOALI: Fine Particle De-Mixing in Granular Flows
Lueptow, R. M., Ottino, J. M. & Umbanhowar, P.
6/1/22 → 5/31/25
Project: Research project
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GOALI: Flow driven segregation at the particle level
Lueptow, R. M., Ottino, J. M., Umbanhowar, P. & Umbanhowar, P.
10/1/19 → 9/30/23
Project: Research project
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UNS: Controlling mixing and segregation of granular media using unsteady flows
Umbanhowar, P., Lueptow, R. M. & Ottino, J. M.
7/1/15 → 6/30/20
Project: Research project
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Cutting and Shuffling: A New Dynamical Systems Paradigm for Mixing
Ottino, J. M., Lueptow, R. M. & Umbanhowar, P.
9/1/14 → 8/31/18
Project: Research project
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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
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Drag force in granular shear flows: regimes, scaling laws and implications for segregation
Jing, L., Ottino, J. M., Umbanhowar, P. B. & Lueptow, R. M., Oct 10 2022, In: Journal of fluid Mechanics. 948, A24.Research output: Contribution to journal › Article › peer-review
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Potentialities and limitations of machine learning to solve cut-and-shuffle mixing problems: A case study
Lynn, T. F., Ottino, J. M., Lueptow, R. M. & Umbanhowar, P. B., Oct 12 2022, In: Chemical Engineering Science. 260, 117840.Research output: Contribution to journal › Article › peer-review
1 Scopus citations -
Segregation forces in dense granular flows: Closing the gap between single intruders and mixtures
Duan, Y., Jing, L., Umbanhowar, P. B., Ottino, J. M. & Lueptow, R. M., Mar 25 2022, In: Journal of fluid Mechanics. 935, A244.Research output: Contribution to journal › Article › peer-review
2 Scopus citations -
Segregation patterns in three-dimensional granular flows
Yu, M., Ottino, J. M., Lueptow, R. M. & Umbanhowar, P. B., Aug 2022, In: Physical Review E. 106, 2, 024902.Research output: Contribution to journal › Article › peer-review
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A unified description of gravity- And kinematics-induced segregation forces in dense granular flows
Jing, L., Ottino, J. M., Lueptow, R. M. & Umbanhowar, P. B., 2021, In: Journal of fluid Mechanics. 925, A29.Research output: Contribution to journal › Article › peer-review
6 Scopus citations
Datasets
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Supplementary material from "Continuum modelling of segregating tridisperse granular chute flow"
Deng, Z. (Contributor), Umbanhowar, P. (Creator), Ottino, J. M. (Creator) & Lueptow, R. M. (Creator), figshare, 2018
DOI: 10.6084/m9.figshare.c.4028617.v1, https://figshare.com/collections/Supplementary_material_from_Continuum_modelling_of_segregating_tridisperse_granular_chute_flow_/4028617/1
Dataset