Jeffrey S. Allen

Jeffrey Allen

Contact

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

  • Medici, Ezequiel F., Allen, Jeffrey S., and Waite, Gregory P., 2014, Modeling Shockwaves Generated by Explosive Volcanic Eruptions,” Geophysical Research Letters, Vol. 41 (2), pp. 414-421, DOI: 10.1002/2013GL058340.
  • Medici, Ezequiel F., Allen, Jeffrey S., 2013, “Evaporation, Two Phase Flow, and Thermal Transport in Porous Media with Application to Low-temperature Fuel Cells,” International Journal of Heat and Mass Transfer, Vol. 65, pp.779-788, DOI:10.1016/j.ijheatmasstransfer.2013.06.035.
  • Rivera, Julio L., Sutherland, John W., Allen, Jeffrey S., 2013, “Lift-Off Behavior of Micro and Nanoparticles in Contact With a Flat Surface,” Journal of Fluids Engineering, Vol. 135 (10) Article No. 101205, 6 pages, DOI: 10.1115/1.4024563.
  • Chevres, Lee Roy, Shin, Dong Hwan, Hernandez, Joseph, Choi, Chang Kyoung, Allen, Jeffrey S., Lee, Seong-Hyuk, 2013, “Fringe Pattern Visualization of Contact Lines during Evaporation of Nanofluid Droplets,” Journal of Heat Transfer, Vol. 135 (8) (080912), Article No. HT-13-1138, 1 page, DOI: 10.1115/1.4024194.
  • Allen, Jeffrey, Herescu, Alexandru, 2012, "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.
  • Allen, Jeffrey, Shahbazian Yassar, Reza, Parikh, Nishith, 2012, "Microstructure of Gas Diffusion Layers for PEM Fuel Cells," Fuel Cells, Vol. 12, No. 3, pp. 382-390.
  • Medici, E., Allen, Jeffrey S., 2011, "Scaling Percolation in Thin Porous Layers," Physics of Fluids, Vol. 23, No. 12, Article ID 122107, 9 pages.
  • Allen, Jeffrey S., Medici, E.F., 2011, "Incorporation of Evaporation and Vapor Transport in Pore Level Models of Fuel Cell Porous Media," ECS Transactions, Vol. 41, No. 1, pp. 141-152.

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