Jeffrey S. Allen

Jeffrey Allen

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John & Joan Calder Associate Professor, Mechanical Engineering–Engineering Mechanics

  • PhD, Mechanical & Aerospace Engineering, University of Dayton
  • MS, Mechanical & Aerospace Engineering, University of Dayton
  • BSE, Mechanical & Aerospace Engineering, University of Dayton

Biography

Dr. Allen is an experimentalist interested in the study of two-phase flow in capillary systems; such as found in the gas flow channels and diffusion media of PEM fuel cells. The behavior of liquid water in the internal passages of Proton Exchange Membrane (PEM) fuel cells, a class of low temperature fuel cells, presents a serious challenge to the development of reliable and efficient power units. The factors which influence capillary flow are well established (contact angle, geometry and surface tension), but the behavior of gas-liquid flows subject to capillary phenomena in the complex, manifolding passages of PEM fuel cells is not fully understood. Other active research involves investigations of the stability of evaporating and condensing liquid films, microfluidic systems such as lab-on-a-chip, microfluidic diagnostic development, design and optimization of micro-fuel reformers, and low-gravity fluid dynamics.

Links of Interest

Research Interests

  • Stability of evaporating and condensing liquid films
  • Microfluidic systems such as lab-on-a-chip
  • Microfluid diagnostic development
  • Design and optimization of micro-fuel reformers
  • Low-gravity fluid dynamics

Areas of Expertise

  • Capillary Flow
  • Interfacial Transport Phenomena
  • Fuel Cells
  • Phase-Change Heat Transfer
  • Microgravity Fluid Physics

Recent Publications

  • Jeffrey Allen, DeSheng (Dennis) Meng, "Micro- and Nanofluidics for Energy Conversion," IEEE Nano Magazine, Vol. 2, No. 4, pp. 19-23, 2009-12-00 Read More
  • Jeffrey Allen, Reza Shahbazian Yassar, Parikh, N., "Effect of Deformation on Electrical Properties of Carbon Fibers used in Gas Diffusion Layer of PEM Fuel Cells," Journal of Power Sources, Vol. 193, No. 2, pp. 766-768, 2009-09-05 Read More
  • Jeffrey Allen, Reza Shahbazian Yassar, N. Parikh, "Effect of Deformation on Eletrical Properties of Carbon Fibers Used in Gas Diffusion Layer of PEM Fuel Cells," Journal of Power Sources, Vol. 193, Issue 2, 2009-09-00
  • Jeffrey Allen, Medici, E., "Existence of the Phase Drainage Diagram in PEM Fuel Cell Fibrous Diffusion Media," Journal of Power Sources, Vol 191, No. 2, pp 417-427, 2009-06-15 Read More
  • Jeffrey Allen, Fultz, D.W., "Visualization of Pressure in Microchannels," Journal of Heat Transfer, Vol. 130, No. 8, 080907 (1 page), 2008-08-00 Read More
  • Jeffrey Allen, James C. Hermanson, Jeramy T. Kimball, Sanjoy M. Som, "Stability and Heat Transfer Characteristics of Unsteady Condensing and Evaporating Films," International Journal of Heat and Mass Transfer Volume 50, Issues 9-10, May 2007, Pages 1927-1937, 2007-05-00 Read More
  • Jeffrey Allen, A. Herescu, "A Theoretical Discussion of a Menisci Micropump Driven by an Electric Field," Journal of Fluids Engineering, Volume 129, Issue 4, 404 (8 pages), 2007-04-00 Read More