Jeff D. Colwell, Ph.D., P.E.

Dr. Colwell specializes in the engineering analysis of thermal and combustion processes, especially the cause, origin, and propagation of fires and explosions. Dr. Colwell has particular expertise investigating fires associated with automobiles, recreation vehicles, motorcycles, and heavy trucks, where typical fire scenarios include post-collision fires, structure fires involving vehicles, and fires that occur while the vehicle is being operated. He analyzes how these fire scenarios, along with vehicle design, operation, maintenance, repair, and aftermarket equipment, are related to mechanisms of fire causation, growth rate, and spread. He has specialized expertise in designing and conducting both component and full-scale tests to evaluate these complex relationships.

Dr. Colwell has also investigated a wide range of fires associated with residential and commercial structures, and industrial complexes associated with the chemical, refining, and mining industries. Technical issues addressed have included cause and origin determination, ignition mechanism, smoldering and self-heating, explosion venting, fire spread, smoke transport, smoke detector operation, building evacuation, fire department response, carbon monoxide poisoning, and handling of hazardous waste. He also evaluates the design and performance of household appliances, heating and cooling equipment, and various other consumer products. Dr. Colwell’s research has focused on forced ignition mechanisms, including spark (electrostatic) and hot-surface ignition of combustible mixtures, as well as ignition mechanisms associated with various types of electrical components in automotive electrical systems. He has also conducted research involving complex two-phase flows, liquid atomization, and droplet transport.

Prior to joining Exponent, Dr. Colwell held research positions at AlliedSignal Aerospace, the Combustion Laboratory at Arizona State University, the High Temperature Gas Dynamics Laboratory at Stanford University, and the Thermal Sciences and Propulsion Center at Purdue University.

Long RT, Colwell JD, Ray R, Grossman H L, Thomas B, Strassburger R. pp. 21-3–21-14. Passenger vehicle fires. In: Fire Protection Handbook, 20th Edition. National Fire Protection Association, Quincy, MA, 2008.

Colwell JD, Mongia R. Reza A. Case study on evacuation rates within the World Trade Center Towers on September 11, 2001. Proceedings, 49th Annual Human Factors and Ergonomics Society Meeting, Orlando, FL, September 26–30, 2005.

Colwell JD, Reza A. Hot surface ignition of automotive and aviation fluids. Fire Technology 2005; 41(2):105–123.

Colwell JD, Reza A. Use of soot patterns to evaluate smoke detector operability. Fire and Arson Investigator; 2003:42–45, July.

Martin RJ, Colwell JD. De Novo VOC from regenerative thermal oxidizers. Proceedings, ASME Summer Heat Transfer Conference, Paper No. HT2003-40557, Las Vegas, NV,
July 21–23, 2003.

Colwell JD, Korb TM, Peck RE. Hot surface ignition of Jet-A fuel by conductive deposits. 29th International Symposium on Combustion, pp. 297–303, Sapporo, Japan, July 2002.

Colwell JD. Hot surface ignition of Jet-A fuel by conductive deposits. Ph.D. Dissertation, Arizona State University, August 2001.

Colwell JD, Peck RE. Ignition of Jet-A fuel by silver oxide deposits. 18th International Colloquium on the Dynamics of Explosions and Reactive Systems, Seattle, WA, August 2001.

Colwell JD, Peck RE. Ignition of Jet-A fuel on silver oxide deposits. Proceedings, 2nd Joint Meeting of the U.S. Sections of the Combustion Institute, Oakland, CA, March 2001.

Cooperrider NK, Hammoud SA, Colwell JD. Characteristics of soil-tripped rollovers. SAE Paper No. 980022, 1998.

Senser DW, Colwell JD, Smith RM. An experimental study of the structure of supercritical fluid and conventional air paint sprays. Proceedings, 22nd Waterborne, High-Solids, and Powder Coatings Symposium, pp. 161–170, New Orleans, LA, February, 1995.

Senser DW, Colwell JD, Nielsen KA. An experimental study of workpiece interaction regions and impact velocities of supercritical fluid spray. Proceedings, 4th Annual ESD Advanced Coatings Technology Conference, pp. 369–379, Dearborn, MI, November 1994.

Senser DW, Colwell JD, Nielsen KA. A comparison between the structure of supercritical fluid and conventional air paint sprays. Proceedings, 7th Annual Conference on Liquid Atomization and Spray Systems, pp. 35–39, Bellevue, WA, May 1994.

Colwell JD, Senser DW, Nielsen KA. Influence of temperature on the structure of supercritical fluid coating sprays. 24th Annual Meeting of the Fine Particle Society, Chicago, IL, August 1993.

Colwell JD. Influence of pressure and temperature on the structure of supercritical fluid coating sprays. M.S. Thesis, Purdue University, August 1993.

Colwell JD, Senser DW, Nielsen KA. Influence on Temperature on the Structure of Supercritical Fluid Coating Sprays. Proceedings, 6th Annual Conference on Liquid Atomization and Spray Systems, pp. 39–43, Worcester, MA, May 1993.

Presentations

Colwell JD. Hot surface ignition—unraveling the myths. Invited Lecture, Defense Research Institute, Strictly Automotive, September 6–7, 2007.

Colwell JD, Reza A. Hot surface ignition of flammable liquids. Invited Lecture, Defense Research Institute, Fire and Casualty Seminar, November 2–3, 2006.

Colwell JD. Role of mechanically damaged wires in the causation of automotive fires. Invited Lecture, Emerging Issues in Motor Vehicle Product Liability Litigation, American Bar Association, April 5–7, 2006.

Colwell JD, Reza A. Case studies on evacuation rates within the World Trade Center Towers on September 11, 2001. Invited Lecture, Defense Research Institute, Fire and Casualty Seminar, November 17–18, 2005.

Colwell JD. The fundamentals and nuances of cause and origin analysis of vehicle fires. Invited Lecture, Emerging Issues in Motor Vehicle Product Liability Litigation, American Bar Association, March 31, 2005.

Colwell JD. The scientific investigation of fires and explosions. Invited Lecture, Arizona State University Department of Mechanical and Aerospace Engineering, February 4, 2005.

Colwell JD. Fire causation and case studies. Invited Lecture, Arizona Association of Defense Counsel, January 19, 2005.

Colwell JD, Carhart M. Litigating the technical issues—case studies in fires, explosions and biomechanics. Invited Lecture, Maricopa County Bar Association, October 13, 2004.

Colwell JD. Investigation of the TWA Flight 800 explosion. Invited Lecture, American Institute of Aeronautics and Astronautics (AIAA), Phoenix Section, September 23, 2004.