Juan C. Ramirez, Ph.D., CFEI

Dr. Ramirez is a mechanical engineer and specializes in thermal sciences including flow processes, thermodynamics, combustion processes, and the behavior of materials at elevated temperatures. He performs fire origin and cause investigations and explosion analysis – past work has included investigations involving industrial equipment such as gas-fired grain dryers, thermal fluid ovens, positive displacement compressors, and conveyor systems.

Prior to joining Exponent, Dr. Ramirez was a post-doctoral research associate at the Materials Science & Technology Division of Los Alamos National Laboratory. During this time, he developed physical models for the kinetics of phase transformations, heat and mass transfer, nucleation, growth, and diffusion. He also performed computational modeling work in the fields of materials processing, solidification, and microfluidics.

Before returning to school full-time for his doctoral work, Dr. Ramirez worked in engineering consulting designing heating, ventilation, and air conditioning systems for retail and grocery stores and office buildings. He also interacted with architects, city officials, and inspectors involved in HVAC projects across the U.S. and Mexico.

Ramirez JC, Eby DJ, Bullen DB, Carpenter AR, Ogle RA. Inerted vessels: Avoiding hazards caused by gas buoyancy. J Loss Prevention 2009; 22: 791-794.

Mihaila B, Stan M, Ramirez JC, Zubelewicz A, Cristea P. Simulations of coupled heat transport, oxygen diffusion and thermal expansion in UO2 nuclear fuel elements. J Nucl Mat 2009; 395:182–189.

Cristea P, Stan M, Ramirez JC. Point defects and oxygen diffusion in fluorite type oxides. J Optoelectr Advanced Mater 2007; 9:1750–1756.

Stan M, Ramirez JC, Cristea P, Hu SY, Deo C, Uberuaga BP, Sriviliputhur S, Rudin SP, Wills JM. Models and simulations of nuclear fuel materials properties. J Alloys Compd 2007; 444–445: 415–423.

Ramirez JC, Stan M, Cristea P. Simulations of heat and oxygen diffusion in UO2 nuclear fuel rods. J Nucl Mat 2006; 359: 174–184.

Ramirez JC, Conlisk AT. Formation of vortices near abrupt nano-channel height changes in electro-osmotic flow of aqueous solutions. Biomed Microdevices 2006; 8:325–330.

Lu Y, Beckermann C, Ramirez JC. Three-dimensional phase-field simulations of the effect of convection on free dendritic growth. J Cryst Growth 2005; 280: 320–334.

Ramirez JC, Beckermann C. Examination of binary alloy free dendritic growth theories with a phase-field model. Acta Materialia 2005; 53:1721–1736.

Ramirez JC, Beckermann C, Karma A, Diepers HJ. Phase-field modeling of solidification of binary alloys with coupled heat and solute diffusion. Physical Review E, 2004: 69: 051607-1 – 051607-2.

Ramirez JC, Beckermann C. Evaluation of a Rayleigh-number-based freckle criterion for Pb–Sn and Ni–base Superalloys. Metall Mater Trans A, 2003: 1525–1536.

Conference Presentations

Ogle RA, Morrison D, Carpenter AR, Ramirez JC. Common causes and corrections for explosions and fires in improperly inerted vessels. The 2008 Annual Meeting of the Venezuelan Society of Safety Executives (SegurShow 2008), Caracas, Venezuela, October 29–31, 2008. (In Spanish).

Ogle RA, Morrison D, Carpenter AR, Ramirez JC. The relationship between automation complexity and operator error. The 2008 Annual Meeting of the Venezuelan Society of Safety Executives (SegurShow 2008), Caracas, Venezuela, October 29–31, 2008. (In Spanish).

Ramirez JC, Eby DJ, Bullen DB, Carpenter AR, Ogle RA. Inerted vessels: Avoiding hazards caused by gas buoyancy. 2008 Annual Symposium, Mary Kay O’Connor Process Safety Center, Texas A&M University, College Station, TX, October 2008.

Morrison D, Ogle RA, Ramirez JC. Evaporator upset investigation in a sugar processing plant. First Andean Congress on Safety and Health at Work, Lima, Perú, October 22–24, 2008. (In Spanish).

Stan M, Mihaila B, Valone SM, Andersson AD, McClellan KJ, Morales L, Conradson SD, Rudin SP, Wills JM, Cristea P, Ramirez JC. Thermodynamic models of actinide oxides. Materials Capability Review, Los Alamos National Laboratory, April 28–May 1, 2008 (invited).

Stan M, Hu SY, Mihaila B, Cristea P, Ramirez JC. Multiscale simulation of thermo-mechanical processes in irradiated fission-reactor materials. Computational Materials Science Network (CMSN) Symposium, Salt Lake City, UT, September 13–15, 2007 (invited).

Stan M, Ramirez JC, Cristea P, Hu SY, Deo C, Uberuaga BP, Srivilliputhur S, Rudin SP, Wills JM. Models and simulations of nuclear fuel materials properties. Materials Capability Review, Los Alamos National Laboratory, Los Alamos, NM, May 15–18, 2007.

Stan M, Ramirez JC, Cristea P. Thermodynamics of nuclear fuel materials. High Temperature Materials Chemistry conference, HTMC, Vienna, Austria, September 18–22, 2006 (invited).

Cristea P, Stan M, Ramirez JC. Point defects and oxygen diffusion in fluorite-type oxides. Romanian Conference on Advanced Materials, ROCAM 2006, Bucharest, Romania, September 9–10, 2006 (invited).

Stan M, Ramirez JC, Cristea P, Baskes MI, Valone SM, Hu SY. Thermodynamics of roses-toward predictive thermodynamic models and simulations. THERMO International 2006 Conference, Boulder, CO, July 30–August 4, 2006 (invited).

Stan M, Uberuaga BP, Srivilliputhur S, Ramirez JC, Deo C, Cristea P, Hu SY, Rudin SP, Wills JM. Models and simulations of nuclear fuel materials. Plutonium Futures—The Science 2006 International Conference, Pacific Grove, CA, July 9–13, 2006 (invited).

Ramirez JC, Zhao P, Heinrich JC. Diffuse and sharp interface methods in thermosolutal dendritic growth. TMS Annual Meeting, San Antonio, TX, March 12–16, 2006.

Ramirez JC, Conlisk AT. Geometry effects in electroosmotic flow in micro and nanochannels. COMSOL Multiphysics Conference, Boston, MA, October 23–25, 2005.

Ramirez JC, Beckermann C. Convective effects on thermosolutal dendritic growth. Poster presentation, TMS Annual Meeting, San Francisco, CA, February 13–17, 2005.

Ramirez JC, Beckermann C. Simulation of binary alloy free dendritic growth with a phase—Field model. Proceedings, International Conference Solidification Science and Processing: Emerging Trends, Bangalore, India, November 17–20, 2004.

Ramirez JC, Beckermann C. Examination of binary alloy free dendritic growth theories with a phase--field model. In: Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz, TMS Annual Meeting, p.373–378, Charlotte, NC, March 14–18, 2004.

Ramirez JC, Beckermann C. Phase—Field modeling of dendritic solidification with coupled heat and solute diffusion. Invited oral presentation to the Computational Phase Transformation Symposium, TMS Annual Meeting, San Diego, CA, March 2–6, 2003.

Ramirez JC, Beckermann C. Quantitative modeling of binary alloy solidification with coupled heat and mass diffusion via the phase—Field method. Proceedings, AIAA 41st Aerospace Sciences Meeting and Exhibit, Reno, NV, January 6–9, 2003.

• Los Alamos National Laboratory, Post-Doctoral Research Associate, 2004–2007
• The University of Iowa, Research and Teaching Assistant, 2000–2004
• Henderson Engineers, HVAC Design Engineer, 1999
  

• American Society of Mechanical Engineers
• National Fire Protection Association
  – Technical Committee on Water Cooling Towers (Principal Member)
• National Association of Fire Investigators