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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

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 journalArticle

  • 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 journalArticle

  • 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 journalArticle

  • 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 journalArticle

  • 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 journalArticle

  • 3 Scopus citations