Office: 2350 Hayward, 169 EWRE
Phone: (734) 763-6830
Fax: (734) 764-4292
Department of Civil and Environmental Engineering
2350 Hayward, 169 EWRE
Ann Arbor, Michigan 48109-2125
American Association for Aerosol Research (AAAR)
• Vice-chair, Control Technology Working Group (2014-present)
American Society for Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE)
Frontiers in Energy Research: Advanced Fossil Fuel Technologies
• Inaugural Associate Editorial Board member (2014-present)
International Society for Electrostatic Precipitation
• Member, Board of Directors (2013-present)
National Academies, National Research Council
• Member, Committee on Changes in New Source Review Programs for Stationary Sources of Air Pollutants (2004-2006)
• Member, Committee to Examine the Disposal of Activated Carbon from the Heating, Ventilation, and Air Conditioning Systems at Chemical Agent Disposal Facilities (2008-2009)
• Member, Committee on Disposal of Legacy Nerve Agent GA and Lewisite Stocks at Deseret Chemical Depot (2009)
• Member, Committee to Review the Design of the Dynasafe Static Detonation Chamber (SDC) System for the Anniston Chemical Agent Disposal Facility (2010)
United Nations Environment Programme (UNEP), Global Mercury Partnership
U.S. Army Chemical Materials Agency/Advanced Chemical Weapons Alternatives (CMA ACWA)
• Member, Standing Advisory Committee on Chemical Demilitarization (2010-2016)
Research focuses on reducing the environmental and health impacts of a variety of airborne aerosols. Current areas of activity include:
Electrostatic precipitation of aerosols with particular interest in the coupling between the fluid and electric fields (i.e., electro-hydrodynamics);
Non-Thermal plasmas as a means for inactivating airborne infectious agents such as viruses & bacteria in ventilation air;
Aerosol optical properties , with emphasis on new emission sources of particulate carbon and potential contributions to atmospheric climate forcing and climate change;
Air toxic compounds emitted from combustion processes and their control;
Liquid droplet combustion, especially non-ideal behavior contributing to formation of products of incomplete combustion.
Research consists of laboratory experiments, numerical simulations, and field studies as appropriate, involving both graduate and undergraduate researchers. This research has funding from and implications for both industrial clients and federal and international agencies tasked with addressing environmental hazards relating to air quality and the emission of air pollutants.
To watch a video of Professor Clack discussing mercury in the air, please visit YouTube.
Clack, H.L. “Opportunities for Post-Combustion Control of Mercury Emissions from Coal Combustion.” In: Mercury in Coal and its Energo-Chemical Processing Products (translated from the Polish), J. Golas and A. Strugala, eds., 2013.
Clack, H.L. (2012). ”Estimates of Increased Black Carbon Emissions from Electrostatic Precipitators during Powdered Activated Carbon Injection for Mercury Emissions Control.” Environmental Science and Technology 46 (13), pp 7327–7333.
Ammigan, K., R.M. Miller, and H.L. Clack (2012). “Effect of Asymmetric Radiant Heating on Monodisperse Acetone-Ethanol and Acetone-Isopropanol Bicomponent Droplets.” International Journal of Multiphase Flows 38, 67-72.
Prabhu, V., T. Kim, Y. Khakpour, S. Serre, and H.L. Clack (2012). “On the Electrostatic Precipitation of Fly Ash-Powdered Mercury Sorbent Mixtures.” Fuel Processing Technology 93, pp. 8-12.
Ammigan, K., R.M. Miller, and H.L. Clack (2011). “Vaporization of Multicomponent Droplets Exposed to Radiant Heating.” Combustion Science &Technology 183, 1412-1432.
Lee, E.M. and H.L. Clack (2010). “In situ detection of altered particle size distributions during simulated powdered sorbent injection for mercury emissions control.” Energy & Fuels 24, pp. 5410-5417.
Clack, H.L. (2009). “Mercury Capture within Coal-fired Power Plant Electrostatic Precipitators: Model Evaluation.” Environmental Science and Technology 43, pp. 1460-1466.
Scala, F. and H.L. Clack (2008). “Mercury Emissions from Coal Combustion: Modeling and Comparison of Hg Capture in a Fabric Filter versus an Electrostatic Precipitator.” Journal of Hazardous Materials 152, pp. 616-623.