Jeffrey S. Allen

Jeffrey Allen


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


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

  • Bellur, K., Médici, E.F., Kulshreshtha, M., Konduru, V., Tyrewala, D., Tamilarasan, A., McQuillen, J., Leão, J.B., Hussey, D.S., Jacobson, D.L., Scherschligt, J., Hermanson, J.C., Choi, C.K., Allen, J.S., "A New Experiment for Investigating Evaporation and Condensation of Cryogenic Propellants," Journal of Cyrogenics, online October 2015, doi:10.1016/j.cryogenics.2015.10.016 Read More
  • Zenyuk, Iryna V., Medici, Ezequiel, Allen , Jeffrey, Weber, Adam Z. “Coupling Continuum and Pore-network Models for Polymer-electrolyte Fuel Cells,” International Journal of Hydrogen Energy, online August 2015, DOI 10.1016/j.ijhydene.2015.08.009 Read More
  • Chang, Jen-Yung, Wang, Shuo, Allen, Jeffrey S., Lee, Seong Hyuk, Chang, Suk Tai, Choi, Young-Ki, Friedrich, Craig R., Choi, Chang Kyoung, "A Novel Miniature Dynamic Cell Culture Platform using Electro-Osmosis Diode Pumping", Biomicrofluidics, Aug 2014, Vol. 8, No. 4, pp. 0444116, DOI:10.1063/1.4892894 Read More
  • Fultz, Derek W., Allen, Jeffrey S., 2014, "Nonintrusive Pressure Measurement in Microfluidic Systems via Backscattering Interferometry," Experiments in Fluids, Vol. 55(6), Article No. 1754, 12 pages, DOI 10.1007/s00348-014-1754-0. Read More
  • Shin, Dong Hwan, Allen, Jeffrey S., Choi, Chang Kyoung, Lee, Seong Hyuk, "Visualization in the Contact Line Region of an Evaporating Nanofluid Drop," Journal of Heat Transfer, Aug 2014, Vol. 136, No. 8, Paper No. HT-14-1211, pp. 080913, DOI: 10.1115/1.4027531
  • Shin, Dong Hwan, Allen, Jeffrey S., Choi, Chang Kyoung, Lee, Seong Hyuk, Visualization of an Evaporating Thin Layer during the Evaporation of a Nanofluid Droplet,” Langmuir, Jan 2015, Vol. 31, No. 4, pp. 1237-1241, DOI: 10.1021/la504133h
  • Narendranath, Aneet D., Hermanson, James C., Kolkka, Robert W., Struthers, Allan A., Allen, Jeffrey S., 2014, "The Effect of Gravity on the Stability of an Evaporating Liquid Film," Microgravity Science and Technology, Vol. 26 (3), pp. 189-199, DOI 10.1007/s12217-014-9395-8. Read More
  • 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. Read More
  • 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. Read More
  • 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. Read More
  • 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. Read More
  • 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. Read More
  • Medici, E., Allen, Jeffrey S., 2011, "Scaling Percolation in Thin Porous Layers," Physics of Fluids, Vol. 23, No. 12, Article ID 122107, 9 pages. Read More
  • 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. Read More
  • Medici, E.F., and Allen, Jeffrey S., 2011, "Modeling and Diagnostics of Fuel Cell Porous Media for Improving Water Transport," ECS Transactions, Vol. 41, No. 1, pp. 165-178, DOI: 10.1149/1.3635552. 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
  • Jeffrey Allen, Son, S.Y., Collicott, S.J., "Chapter 46. PEMFC Flow-Field Design for Improved Water Management," chapter in Handbook of Fuel Cells, Volume 5, 2009-01-00
  • 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

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

Principal Investigator: Jeffrey Allen
Co-PI: Chang Kyoung Choi
College/School: College of Engineering
Department(s): Mechanical Engineering-Engineering Mechanics
Center/Institute: Multi-Scale Technologies Institute (MuSTI)