Jeffrey S. Allen

Jeffrey Allen

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John & Joan Calder 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

Areas of Expertise

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

Research Interests

  • Stability of evaporating and condensing liquid films
  • Capillary-Scale Gas-Liquid Flow
  • Near-Field Optical Diagnostics
  • Thermal and Mass Transport in Porous Media and Fuel Cells
  • Low-gravity fluid dynamics
  • Weak Atmospheric Shock Waves

Recent Publications

  • Jeffrey Allen, Alexandru Herescu, "The Influence of Channel Wettability and Geometry on Water Plug Formation and Drop Location in a Proton Exchange Membrane Fuel Cell Flow Field," Journal of Power Sources, Vol. 216, pp. 337-344, 2012-10-15 Read More
  • Jeffrey Allen, Reza Shahbazian Yassar, Nishith Parikh, "Microstructure of Gas Diffusion Layers for PEM Fuel Cells," Fuel Cells, Vol. 12, No. 3, pp. 382-390, 2012-04-12 Read More
  • Jeffrey Allen, E.F. Medici, "Scaling Percolation in Thin Porous Layers," Physics of Fluids, Vol. 23, No. 12, Article ID 122107, 9 pages, 2011-12-23 Read More
  • Jeffrey Allen, E.F. Medici, "Incorporation of Evaporation and Vapor Transport in Pore Level Models of Fuel Cell Porous Media," ECS Transactions, Vol. 41, No. 1, pp. 141-152, 2011-00-00 Read More
  • Jeffrey Allen, E.F. Medici, "Modeling and Diagnostics of Fuel Cell Porous Media for Improving Water Transport," ECS Transactions, Vol. 41, No. 1, pp. 165-178, 2011-00-00 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, Andrew M. Schafer, "Improved Water Removal from Fuel Cell Flow Channels via Natural Frequency Excitation of Free Surfaces," ECS Transactions, Vol. 41, No. 1, pp. 1887-1896, 2011-00-00 Read More
  • 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, 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

Recent Research Projects

A New Experiment for Determining Evaporation and Condensation Coefficients of Cryogenic Propellants and Development of an Efficient Computational Model of Cryogenic Film Stability in Microgravity

Investigators
Principal Investigator: Jeffrey Allen
Co-PI: Chang Kyoung Choi
College/School: College of Engineering
Department(s): Mechanical Engineering-Engineering Mechanics