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

  • Medici, E. F., I. V. Zenyuk, D. Y. Parkinson, A. Z. Weber, and J. S. Allen. "Understanding Water Transport in Polymer Electrolyte Fuel Cells Using Coupled Continuum and Pore-Network Models." Fuel Cells, Apr 2016. DOI: 10.1002/fuce.201500213 Read More
  • Médici, Ezequiel F. and Jeffrey S. Allen. "A Quantitative Technique to Compare Experimental Observations and Numerical Simulations of Percolation in Thin Porous Materials." Transport in Porous Media, pp. 1-13, Mar 2016. Read More
  • Bellur, Kishan, Vinaykumar Konduru, Manan Kulshrestha, Daanish Tyrewala, Ezequiel Medici, Jeffrey S. Allen, Chang Kyoung Choi, Daniel S. Hussey, David C. Jacobson, Juscelino B. Leão, John McQuillen, James Hermanson, and Arun Tamilarasan. "Contact Angle Measurement of Liquid Hydrogen (Lh2) in Stainless Steel and Aluminum Cells." Journal of Heat Transfer, Vol. 138, No. 2, pp. 020904-04, Jan 2016. DOI: 10.1115/1.4032232 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, Vol. 40, No. 46, pp. 16831-16845, Dec 2015, DOI 10.1016/j.ijhydene.2015.08.009 Read More
  • 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
  • Moon, J. H., C. K. Choi, J. S. Allen, and S. H. Lee. "A Rebounding Droplet Impacting on a Static Droplet." Journal of Heat Transfer-Transactions of the ASME 137, No. 8, 1 page, Aug 2015. Accession Number: WOS:000357585600010 Read More
  • Bellur, Kishan, Ezequiel Medici, Jeffrey Allen, Chang Kyoung Choi, Jimes Hermanson, Arun Tamilarasan, Daniel Hussey, David Jacobson, Juscelino B. Leao, and John McQuillen. "Neutron Radiography of Condensation and Evaporation of Hydrogen in a Cryogenic Condition." Journal of Heat Transfer, Vol. 137, No. 8, Article 080901-01, Aug 2015. DOI.10.1115/1.4030442 Read More
  • 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