Jeffrey S. Allen
- MEEM 831
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
- 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
- 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.
- 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.
- 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.