Dr. Leonard F. Pease is the group leader for the Operational Systems Engineering Group in the Earth Systems Science Division at Pacific Northwest National Laboratory (PNNL). His research includes leading the invention and development of the mesofluidic suite of separations technologies for slurry processing. Also, since spring 2020, Dr. Pease has been evaluating how COVID-19 transports through buildings.
He originally joined PNNL in 1992, leaving to pursue and obtain a PhD in chemical and materials engineering from Princeton University, specializing in electrohydrodynamics and polymer patterning. Thereafter, he pursued research at postdoctoral level at the National Institute of Science and Technology (NIST), specializing in virus characterization using aerosol techniques.
After founding two companies to commercialize biomedical solutions he and his team invented, Dr. Pease returned to PNNL to support jet mixing, slurry transport, industrial hygiene, thermodynamics, advanced manufacturing, and mesofluidic separations projects. His expertise includes analytical and computational modeling, quality assurance, and flowsheet improvement. He has a broad technical background and a strong approach to innovation and multidisciplinary thinking.
Disciplines and Skills
- Aerosol Science
- Biological and Bioprocess Engineering
- Electrochemical Engineering
- Fluid Dynamics and Mixing
- Internal Medicine
- Mass Transfer Processes
- Mathematical Modeling and Validation
- Microbiome Science
- Organic and Polymer Chemistry
- Pharmaceutical Process Development
- Process Control, Intensification, and Design
- Quality Assurance Review
- Social Network Analysis
- Slurry Transport
- PhD, Chemical and Materials Engineering, Princeton University
- BS, Chemical Engineering, Brigham Young University
Affiliations and Professional Service
Arab-American Frontiers of Science, Engineering, and Medicine Symposium, an international conference hosted by the National Academic of Sciences, Engineering, and Medicine (NASEM):
- Organizing committee co-chair for 8th annual symposium (virtual, 2021)
- Co-chair for infectious disease session at 7th annual symposium (Cairo, 2019)
- Chair for microbiome session at 6th annual symposium (Kuwait, 2018)
- Patent pending (Battelle No. 31482-E), "Mesofluidic separator—Clog-free filtration system"
Pease L.F., T. Salsbury, K.K. Anderson, R.M. Underhill, J.E. Flaherty, E. Vlachokostas, and C. Burns, et al. 2022. "Size Dependent Infectivity of SARS-CoV-2 via Respiratory Droplets Spread through Central Ventilation Systems." International Communications in Heat and Mass Transfer 132. PNNL-SA-161825. doi:10.1016/j.icheatmasstransfer.2021.105748
Vlachokostas E., C. Burns, T. Salsbury, R.C. Daniel, D.P. James, J.E. Flaherty, and N. Wang, et al. 2022. "Experimental Evaluation of Respiratory Droplet Spread to Rooms Connected by a Central Ventilation System." Indoor Air 32, no. 1:Art. No. e12940. PNNL-SA-162537. doi:10.1111/ina.12940
Burns C., T.G. Veldman, J.E. Serkowski, R.C. Daniel, X. Yu, M.J. Minette, and L.F. Pease. 2021. "Mesofluidic Separation versus Dead-end Filtration." Separation and Purification Technology 254. PNNL-SA-150803. doi:10.1016/j.seppur.2020.117256
Pease L.F., A.P. Kuprat, G.L. Dai, A.H. Bonneville, M.D. White, and C.A. Fernandez. 2021. "Insights into the Physical-Chemical Properties of a CO2-Responsive Fracturing Fluid." In Proceedings of the World Geothermal Congress 2021, October 24-27, 2021, Virtual and Reykjavik, Iceland, Paper No. 31000. Bonn:International Geothermal Association. PNNL-SA-166429.
Pease L.F., J.A. Bamberger, and M.J. Minette. 2021. "Attached and Attaching Three-Dimensional Jets from Circular Nozzles: Analytical Model." Journal of Fluids Engineering--Transactions of the ASME 143, no. 3:034503. PNNL-SA-153350. doi:10.1115/1.4049045
Pease L.F., J.A. Bamberger, C. Burns, and M.J. Minette. 2021. "Large Particle Separation From Non-Newtonian Slurries Using Bump Arrays." In Proceedings of the ASME 2021 Fluids Engineering Division Summer Meeting (FEDSM 2021), August 10-12, 2021, Virtual, Online, 3, FEDSM2021-65904, V003T08A023. New York, New York:ASME. PNNL-SA-159468. doi:10.1115/FEDSM2021-65904
Pease L.F., J.E. Serkowski, T.G. Veldman, J. Williams, X. Yu, M.J. Minette, and J.A. Bamberger, et al. 2021. "Can Bump Arrays Separate Particles from Turbulent Flows?." In Proceedings of the ASME 2021 Fluids Engineering Division Summer Meeting (FEDSM 2021), August 10-12, 2021, Virtual, Online, 3, FEDSM2021-67696, V003T08A024. New York, New York:ASME. PNNL-SA-153733. doi:10.1115/FEDSM2021-67696
Pease L.F., N. Wang, T. Salsbury, R.M. Underhill, J.E. Flaherty, E. Vlachokostas, and G.R. Kulkarni, et al. 2021. "Investigation of Potential Aerosol Transmission and Infectivity of SARS-CoV-2 through Central Ventilation Systems Building and Environment." Building and Environment 197. PNNL-SA-156558. doi:10.1016/j.buildenv.2021.107633
Fiskum S.K., L.F. Pease, and R.A. Peterson. 2020. "Review of Ion Exchange Technologies for Cesium Removal from Caustic Tank Waste." Solvent Extraction and Ion Exchange 38, no. 6:573-611. PNNL-SA-149785. doi:10.1080/07366299.2020.1780688
Pease L.F., and J.A. Bamberger. 2020. "Attached Jet Velocity Profiles in Mixing Tanks." In Proceedings of the ASME 2020 Fluids Engineering Division Summer Meeting FEDSM2020 July 13-16, 2020, Orlando, Florida, USA, 2, Paper No: FEDSM2020-20220, V002T03A039. New York, New York:ASME. PNNL-SA-150572. doi:10.1115/FEDSM2020-20220
Pease L.F., J.A. Bamberger, and M.J. Minette. 2020. "Implications of Non-Bingham Rheology." In Proceedings of the ASME 2019 International Mechanical Engineering Congress and Exhibition November 11-14, 2019 Salt Lake City, UT, 7, Paper No: IMECE2019-11841, V007T08A029. New York, New York:ASME. PNNL-SA-142881. doi:10.1115/IMECE2019-11841
Pease L.F., M.J. Minette, and J.A. Bamberger. 2020. "Radial Wall Jet Flow Over Sigmoidal Surfaces." In Proceedings of the ASME 2020 International Mechanical Engineering Congress and Exposition IMECE2020 November 16-19, 2020, Virtual, Online, 10, Paper No: IMECE2020-24058, V010T10A017. New York, New York:ASME. PNNL-SA-153394. doi:10.1115/IMECE2020-24058
Pease L.F., A. Fuher, J.A. Bamberger, C. Burns, R.C. Daniel, and M.J. Minette. 2019. "Is Radioactive Tank Waste a Bingham Fluid?." In Proceedings of the ASME-JSME-KSME 2019 Joint Fluids Engineering Conference, AJKFLUIDS2019, July 28-August 1, 2019, San Francisco, CA. New York, New York:American Society of Mechanical Engineers. PNNL-SA-142356. doi:10.1115/AJKFluids2019-5216
Pease L.F., K.K. Anderson, J.A. Bamberger, and M.J. Minette. 2019. "Statistics for Testing Under Adverse Conditions." Journal of Verification, Validation and Uncertainty Quantification 4, no. 2:Art. No. 021007; Paper No: VVUQ-18-1037. PNNL-SA-138318. doi:10.1115/1.4045117
Pease L.F., R.C. Daniel, and C. Burns. 2019. "Slurry Rheology of Hanford Sludge." Chemical Engineering Science 199. PNNL-SA-138317. doi:10.1016/j.ces.2018.12.044
Rappe K.G., L. Alexander, J.H. Wahl, A.M. Melville, L.J. Rotness, R.K. Hagins, and A.H. Zacher, et al. 2018. NUCON Vapor Abatement Unit Performance on Hanford Tank Farm Chemicals of Potential Concern. PNNL-27816. Richland, WA: Pacific Northwest National Laboratory. NUCON Vapor Abatement Unit Performance on Hanford Tank Farm Chemicals of Potential Concern
Bamberger J.A., L.F. Pease, and M.J. Minette. 2017. "Solids Erosion Patterns Developed by Pulse Jet Mixers." In ASME 2017 Fluids Engineering Division Summer Meeting, Symposium on Fluid Measurement and Instrumentation, July 30-August 3, 2017, Waikoloa, Hawaii, 1B, V01BT06A012; Paper No. FEDSM2017-69382. New York, New York:American Society of Mechanical Engineers. PNNL-SA-122491. doi:10.1115/FEDSM2017-69382
Pease L.F., J.A. Bamberger, and M.J. Minette. 2017. Implications of Upwells as Hydrodynamic Jets in a Pulse Jet Mixed System. PNNL-24382 Rev 1.0. Richland, WA: Pacific Northwest National Laboratory. Implications of Upwells as Hydrodynamic Jets in a Pulse Jet Mixed System
Pease L.F. 2016. Drag Reducing and Cavitation Resistant Coatings. PNNL-25923. Richland, WA: Pacific Northwest National Laboratory. Drag Reducing and Cavitation Resistant Coatings
Pease L.F., J.A. Bamberger, L.A. Mahoney, S.T. Yokuda, and M.J. Minette. 2016. "A Simple Criterion to Estimate Performance of Pulse Jet Mixed Vessels." In Proceedings of the ASME 2016 Fluids Engineering Division Summer Meeting FEDSM2016 July 10-14, 2016, Washington, DC, 1B, V01BT24A004, FEDSM2016-7751. New York, New York:American Society of Mechanical Engineers. PNNL-SA-116485. doi:10.1115/FEDSM2016-7751
Pease L.F., J.A. Bamberger, and M.J. Minette. 2015. Implications of Upwells as Hydrodynamic Jets in a Pulse Jet Mixed System. PNNL-24382; WTP-RPT-239, Rev 0. Richland, WA: Pacific Northwest National Laboratory. Implications of Upwells as Hydrodynamic Jets in a Pulse Jet Mixed System
Erian F.F., and L.F. Pease. 2001. "Three Phase Upward Flow in a Vertical Pipe." In Proceedings of the Fourth International Conference on Multiphase Flow. ICMF 2001, New Orleans, Louisiana, May 27-June 1, 2001, edited by Efstathios Michaelides, 13 pages. New York, New York:American Institute of Chemical Engineers. PNNL-SA-34903.