Dr. Ranganathan Gopalakrishnan

R. Eugene Smith Associate Professor and Graduate Program Coordinator

(901) 678-2580
Engineering Science Building 312B
Office Hours
Appointment Only
Dr. Ranganathan Gopalakrishnan


Professional Experience:

  • Associate Professor, Department of Mechanical Engineering, The University of Memphis, August 2022 - current
    R. Eugene Smith Associate Professor of Mechanical Engineering (Sept. 2022 – Aug. 2023)
  • Assistant Professor, Department of Mechanical Engineering, The University of Memphis, August 2016 – 2022
    UMRF Ventures Assistant Professor of Mechanical Engineering (Sept. 2020-Aug. 2022)
    R. Eugene Smith Associate Professor of Mechanical Engineering (Sept. 2021 – Aug. 2022)
    US Dept of Energy EARLY CAREER Award 2020 https://science.osti.gov/early-career
  • Visiting Academic Fellow, Laboratoire des Sciences des Procédés et des Matériaux, University Paris XIII, July 1 – 20, 2018.
  • Lecturer, Department of Mechanical and Industrial Engineering, The University of Iowa, August 2015 to July 2016
  • Postdoctoral Scholar in Chemical Engineering, University of California at Berkeley, October 2014 to July 2015.
  • Postdoctoral Scholar in Chemical Engineering, California Institute of Technology, September 2013 to September 2014.


Educational Background:

  • Ph. D., University of Minnesota – Twin Cities, Minneapolis, MN, U. S. A., August 2013.
  • Bachelor of Technology (Mechanical Engineering), National Institute of Technology, Tiruchirappalli, India. May 2008.


Scholarly Interests:

  • Transport processes in gas-phase systems (aerosols, dusty plasmas and ionized gases)
  • High concentration aerosol generation using ultrasonic dispersion of powders
  • Aerosol Impact Consolidation method for producing ceramic thin films


Peer Reviewed Publications:


Suresh*, V., Liu*, Z., Perry*, Z. and Gopalakrishnan, R., Modeling Particle-Particle Binary Coagulation Rate Constants for Spherical Aerosol Particles at High Volume Fractions Using Langevin Dynamics Simulations. Journal of Aerosol Science 164: 106001. https://doi.org/10.1016/j.jaerosci.2022.106001 


Suresh*,#, V., Li*,#, L., Redmond Go Felipe*, J. and Gopalakrishnan, R., Modeling nanoparticle charge distribution in the afterglow of non-thermal plasmas and comparison with measurements Journal of Physics D: Applied Physics 54, 275205 (2021).

Li*, L. and Gopalakrishnan, R. (2021), An experimentally validated model of diffusion charging of arbitrary shaped aerosol particles. Journal of Aerosol Science 151: 105678. 

Suresh*, V. and Gopalakrishnan, R. (invited article), Tutorial: Langevin Dynamics methods for aerosol particle trajectory simulations and collision rate constant modeling. Journal of Aerosol Science 155: 105476. 


Li*, L., Chahl*, H. S. and Gopalakrishnan, R. (2020), Comparison of the predictions of Langevin Dynamics-based diffusion charging collision kernel models with canonical experiments, J. Aerosol. Sci. 140, 105481.

Ahmed*, R., Suresh*, V., Li*. L. and Gopalakrishnan, R. (2020), Scalable generation of high concentration aerosol in the size range of 0.1–10 μm from commercial powders using ultrasonic dispersion, Powder Technology 376, 52. 


Ahmed*, R., & Gopalakrishnan, R. (2019), Computational study of electrostatic focusing of aerosol nanoparticles using an Einzel lens, Journal of Aerosol Science, 105443 (2019).

Chng*, E. J., Watson, A. B., Suresh*, V., Fujiwara, T., Bumgardner, J. D., & Gopalakrishnan, R. (2019), Adhesion of electrosprayed chitosan coatings using silane surface chemistry, Thin Solid Films, 137454.

Chahl*, H. S. and Gopalakrishnan, R., (2019) High potential, near free molecular regime Coulombic collisions in aerosols and dusty plasmas, Aerosol Science and Technology, 53(8): 933-957.

Pokharel*, L., Parajuli*, P., Li*, L., Chng*, E. J., and Gopalakrishnan, R., (2019) An ultrasonic feeding mechanism for continuous aerosol generation from cohesive powders. Aerosol Science and Technology, 53(3): 321-331. 

Wong, C.-S., Gopalakrishnan, R., and Goree, J. A., (2019) Fluctuation-theorem method of measuring a particle's mass without knowing its shape or density, Journal of Aerosol Science, 129: 116-123.


Wong, C.-S., Goree, J. A., & Gopalakrishnan, R., (2018) Experimental demonstration that a free-falling aerosol particle obeys a fluctuation theorem, Physical Review E (Rapid Communication), 97: 050601(R).

2016 & prior years

Gopalakrishnan, R., Kawamura, E., Lichtenberg, A. J., Lieberman, M. A., & Graves, D. B., (2016) Solvated electrons at the atmospheric pressure plasma-water anodic interface J. Phys. D: Appl. Phys., 49: 295205.
Selected by the Editorial Board of J. Phys. D: Appl. Phys. to feature in Highlights of 2016.

Gopalakrishnan, R., McMurry, P. H., & Hogan, C. J., (2015). The Bipolar Diffusion Charging of Nanoparticles: A Review and Development of Approaches for Non-Spherical Particles. Aerosol Science and Technology, 49(12): 1181-1194.

Gopalakrishnan, R., McMurry, P. H., & Hogan, C. J. (2015), The electrical mobilities and scalar friction factors of modest-to-high aspect ratio particles in the transition regime. Journal of Aerosol Science, 82: 24-39. https://doi.org/10.1016/j.jaerosci.2015.01.001 

Gopalakrishnan, R., Thajudeen, T., Ouyang, H. & Hogan, C. J. (2013), The unipolar diffusion charging of arbitrary shaped aerosol particles. Journal of Aerosol Science, 64: 60-80.

Gopalakrishnan, R., Meredith, M. J., Larriba, C. & Hogan, C. J. (2013), Brownian dynamics determination of the bipolar steady charge distribution on sphere and non-spheres in the transition regime. Journal of Aerosol Science, 63: 126-145.

Thajudeen, T., Gopalakrishnan, R. & Hogan, C. J. (2012), The collision rate of non-spherical particles and aggregates for all diffusive Knudsen numbers. Aerosol Science and Technology, 46(11): 1174-1186.

Ouyang, H., Gopalakrishnan, R. & Hogan, C. J. (2012), Nanoparticle collisions and growth in the gas phase in the presence of singular attractive potentials. Journal of Chemical Physics, 137: 064316. https://doi.org/10.1063/1.4742064 

Gopalakrishnan, R., & Hogan, C. J. (2012), Coulomb-influenced collisions in aerosols and dusty plasmas.  Phys. Rev. E, 85: 026410. 

Gopalakrishnan, R., Thajudeen, T. & Hogan, C. J. (2011), Collision limited reaction rates for arbitrarily shaped particles across the entire diffusive Knudsen number range. Journal of Chemical Physics, 135: 054302.

Gopalakrishnan, R., & Hogan, C. J. (2011), Determination of the transition regime collision kernel from mean first passage times. Aerosol Science and Technology, 45: 1499-1509.

Granted Patents:

Gopalakrishnan, et al., “SYSTEMS AND METHODS FOR DISPERSION OF DRY POWDERS”, US Patent Number 11,358,112 

For prospective graduate assistants and postdoctoral applicants: If you would like to know more details about current projects in my group, feel free to contact me at rgplkrsh@memphis.edu. If you are seeking graduate assistant/postdoc positions, state "PhD/Postdoc applicant for Summer/Fall/Spring 20xx" in the subject line.