Dr. Ashish Karn

Assistant Professor -Selection Grade (DOJ - 18.07.2017, Regular)

B.Tech (Mechanical Engineering), IIT Delhi  

M.S. (Aerospace Engineering, Mechanical Engineering & Mechanics), University of Minnesota Twin Cities, USA 

Ph.D.(Aerospace Engineering, Mechanical Engineering & Mechanics), University of Minnesota Twin Cities, USA

Area of Specialization:

Experimental thermal-fluid sciences, Small scale hydropower: Silt and Cavitation erosion in hydro turbines; Hydrokinetic turbines, Underwater acoustics; Gas-liquid mass transfer for environmental applications such as wastewater treatment, aeration and water desalination; Naval hydrodynamics; Multiphase flows: bubbles and drops; Flow Measurement; Drop Impact; Particle/Shadow Image Velocimetry; Digital image processing; Aerosol Measurement and Instrumentation; Particle Technology; Nanostructure growth and characterization (Refer to https://mpflupes.wixsite.com/mpflupes or umn.edu/~karn)

Research & Publications:

Publications

  • Karn, A., Arndt, R., & Hong, J. (2016). An experimental investigation into supercavity closure mechanisms. Journal of Fluid Mechanics, 789, 259-284 (Featured on the cover page of Journal of Fluid Mechanics).
  • Kumar, A., Saha, A.K., Panigrahi, P.K., Karn, A. (2019). On the flow physics and vortex behavior of rectangular orifice synthetic jets. Experimental Thermal and Fluid Science, 103, 163-181.
  • Karn, A., De, R., Kumar, A., Some insights into drop impacts on a hydrophobic surface. (2020) Journal of Applied Fluid Mechanics. 13(2), 527-536.
  • Karn, A., De, R., Kumar, A. A Qualitative Inter-relation between Drop Impacts on a Solid Surface and the Interaction of a Droplet Placed Inside a Superheated Pool. (2019) Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 60(1), 85-94.
  • Karn, A., Chintala, V., Kumar, S. (2019). On the determination and variations in Sky temperature and its effect on solar cooker performance. Heat Transfer – Asian Research. 48(5), 1830 – 1856.
  • Kumar, A., Karn, A. (2018). Qualitative and Quantitative characterization of a synthetic jet mounted on a convex torpedo-like surface under cross-flow. International Journal of Heat and Fluid Flow, 74, 198-208.
  • Karn, A., Chawdhary, S. (2018). On the synergistic interrelation between supercavity formation through vaporous and ventilated routes. International Journal of Multiphase Flow, 104, 1-8.
  • Kumar, S. S., Karn, A., Arndt, R. & Hong, J. (2017). Internal flow measurements of a drop impacting a solid surface. Experiments in Fluids 58:12.
  • Karn, A., Ellis, C., Arndt, R. & Hong, J. (2015). An integrative image measurement technique for dense bubbly flows with a wide size distribution. Chemical Engineering Science, 122, 240-249.
  • Karn, A., Monson, G., Ellis, C., Hong, J., Arndt, R., & Gulliver, J. (2015). Mass transfer studies across ventilated hydrofoils: A step towards hydroturbine aeration. International Journal of Heat and Mass Transfer, 87, 512-520.
  • Cao, L., Karn, A., Arndt, R. & Hong, J. (2017). Numerical investigations into the pressure distribution within a ventilated supercavity. Journal of Fluids Engineering, 139 (2), 021302.
  • Karn, A., Rosiejka, B. (2017). Air entertainment characteristics of artificial supercavities for free and constrained closure models. Experimental Thermal and Fluid Science , 81, 364-369.
  • Shao, S., Karn, A., Ahn, B. K., Arndt, R., Hong, J. (2017). A comparative Study of Supercavitation across two closed- wall water tunnel facilities. Experimental Thermal and Fluid Science, 88, 519-529.
  • Karn, A. (2017). Characterization of bubbly flow systems: A review. International Journal of Petrochemical Science and Engineering, 2(6): 00053.
  • Karn, A., Kumar, N., & Aravindan, S. (2017). Chemical Vapor Deposition Synthesis of Novel Indium Oxide Nanostructures in Strongly Reducing Growth Ambient. Journal of Nanostructures 7(1), 64-76.
  • Karn, A., Arndt, R., & Hong, J. (2016). Gas entrainment behaviors in the formation and collapse of a ventilated supercavity. Experimental Thermal and Fluid Science, 79, 294-300.
  • Karn, A., Shao, S., Arndt, R., & Hong, J. (2016). Bubble coalescence and breakup in turbulent bubbly wake of a ventilated hydrofoil. Experimental Thermal and Fluid Science, 70, 397-407.
  • Lee, S.J., Kawakami, E., Karn, A. & Arndt, R. (2016). A Comparative study on the behaviors of ventilated supercavities between experimental models with different cavitator configurations. Fluid Dynamics Research, 48, 45506- 45517.
  • Karn, A., Arndt, R., & Hong, J. (2015). Dependence of supercavity closure upon flow unsteadiness. Experimental Thermal and Fluid Science, 68, 493-498.
  • Karn, A., Ellis, C., Hong, J.,& Arndt, R. (2015). Investigations into the turbulent bubbly wake of a ventilated hydrofoil: moving toward improved turbine aeration techniques. Experimental Thermal and Fluid Science, 64, 186-195.
  • Karn, A., Ellis, C., Milliren, C. Hong, J., Scott, D., Arndt, R., & Gulliver, J. (2015). Bubble size characteristics in ventilated hydrofoils with two aeration configurations. International Journal of Fluid Machinery and Systems 8 (2), 73- 83.
  • Karn, A., Kumar, M., Singh, V.N., Mehta, B.R., Aravindan, S. & Singh, J.P. (2012). Growth of Indium Oxide and Zinc-doped Indium Oxide Nanostructures. Chemical Vapor Deposition, 18, 295-301.
  • Karn, A., Ragunath, V., De, R., Chintala, R. & Kumar, A. (2018). High Speed imaging reveals a close resemblance between drop impacts on a solid surface and the interaction of a cold droplet placed upon a hot liquid pool. Proceedings of 7th International and 45th National Conference on Fluid Mechanics and Fluid Power.
  • Srivastava, A., Mishra, A., De, R., Chintala, V., Kumar., A.,Karn, A., (2018). Some insights into drop impacts on a hydrophobic surface. Proceedings of 7th International and 45th National Conference on Fluid Mechanics and Fluid Power, IIT Bombay, India.
  • Chintala, V., Kumar, S., Kumar, P., Kumar, A., Karn, A., (2018). Development of an after-treatment device with low cost catalysts for NOx emission reduction from diesel engines. Proceedings of 7th International and 45th National Conference on Fluid Mechanics and Fluid Power, IIT Bombay, India.
  • Karn, A. (2017). Exploring the relationship between natural and artificial modes of supercavitation. Proceedings of 44th National Conference on Fluid Mechanics and Fluid Power.
  • Karn, A., Narula, V., Arndt R. & Hong, J. (2016). Insight into Ventilation Demand Estimation for High-speed Supercavitating Underwater Vehicles. Lectures in Mechanical Engineering, Springer.
  • Karn, A., Rosiejka, B., Narula, V. & Chaturvedi, A., (2016). Some insights into air entrainment characteristics of artificial supercavities. Proceedings of 6th International and 43rd National Conference on Fluid Mechanics and Fluid Power.
  • Karn, A., Huang, R., Shao, S., Arndt, R., & Hong, J. (2016). Probing into physics of ventilation demand for supercavitating underwater vehicles. Proceedings of 31st Symposium on Naval Hydrodynamics, Monterey, CA.
  • Ahn, B.K., Jeong, S.W., Kim, J.H., Shao, S., Karn, A., Hong, J., & Arndt, R., (2016). An experimental Investigation of artificial supercavitation. Proceedings of 31st Symposium on Naval Hydrodynamics, Monterey, CA.
  • Karn, A., Gulliver, J. S., Monson, G., Ellis, C., Arndt, R., & Hong, J. (2016). Gas transfer in a bubbly wake flow. IOP Conf. Ser.: Earth Environ. Sci. 35 (1), 012020.
  • Karn, A., De, R., Arndt, R., & Hong, J. (2015). Closure mechanisms of ventilated supercavities under steady and unsteady flows. Journal of Physics: Conference Series. 656 (1), 012145.
  • Ellis, C., Karn, A., Hong, J., Lee, S., Kawakami, E., Scott, D., Gulliver, J. & Arndt, R. (2014). Measurements in the wake of a ventilated hydrofoil: a step towards improved turbine aeration techniques. IOP Conf. Ser.: Earth Environ. Sci. 22, 062009

Conferences:

  • Srivastava, A., Mishra, A., De, R., Chintala, V., Kumar., A.,Karn, A., (2018). Some insights into drop impacts on a hydrophobic surface. 7th International and 45th National Conference on Fluid Mechanics and Fluid Power, IIT Bombay, India.
  • Chintala, V., Kumar, S., Kumar, P., Kumar, A., Karn, A., (2018). Development of an after-treatment device with low cost catalysts for NOx emission reduction from diesel engines. 7th International and 45th National Conference on Fluid Mechanics and Fluid Power, IIT Bombay, India.
  • Karn, A., Ragunath, S., De., R., Chintala, V., Kumar., A., (2018). High speed imaging reveals a close resemblance between drop impacts on a solid surface and the interaction of a cold droplet placed upon a hot liquid pool. 7th International and 45th National Conference on Fluid Mechanics and Fluid Power, IIT Bombay, India.
  • Karn, A., (2017). Exploring the relationship between natural and artificial modes of supercavitation. 44th National Conference on Fluid Mechanics and Fluid Power, Amritapuri, Kollam, Kerala, India.
  • Karn, A., Narula, V., Arndt R. & Hong, J. (2016). Insight into Ventilation Demand Estimation for High-speed Supercavitating Underwater Vehicles. 3rd International Conference on Applications of Fluid Dynamics, Dhanbad, India.
  • Karn, A., Rosiejka, B., Narula, V. & Chaturvedi, A., (2016). Some Insights into Air Entrainment Characteristics of Artificial Supercavities. 6th International and 43rd National Conference on Fluid Mechanics and Fluid Power, Allahabad, India
  • Karn, A., Shao, S., Arndt, R. E. A., & Hong, J. (2016). Probing into physics of ventilated demand for supercavitating underwater vehicles. 31st ONR Symposium on Naval Hydrodynamics, Monterey, CA
  • Ahn, B.K., Jeong, S.W., Kim, J.H., Shao, S., Karn, A., Hong, J., & Arndt, R., (2016). Experimental Investigation of artificial supercavitation. 31st ONR Symposium on Naval Hydrodynamics, Monterey, CA
  • Karn, A., Monson, G. M., Ellis, C., Hong, J., Arndt, R. E. A., & Gulliver, J. (2015). Oxygen transfer across ventilated hydrofoils. The 7th International Symposium on Gas Transfer at Water Surfaces, Seattle.
  • Karn, A., Arndt, R. E. A., & Hong, J. (2015). Closure mechanisms of ventilated supercavities under steady and unsteady flow conditions. 9th International Symposium on Cavitation, Switzerland.
  • Karn, A., Arndt, R. E. A. & Hong, J. (2015). On the relationship between supercavity closures, air entrainment and internal flows. 68th Annual Meeting of APS-DFD, Boston.
  • De, R., Karn, A., Noonan, J., Rosiejka, B., Arndt, R. , & Hong, J. (2015). Characterization of drop impact based on internal flow quantification. 68th Annual Meeting of APS-DFD, Boston.
  • Karn, A., Arndt, R. E. A. & Hong, J. (2015), A robust image analysis approach for high void fraction gas-liquid flows, 3rd World Congress on Petrochemistry and Chemical Engineering, Atlanta
  • Karn, A., Ellis, C., Arndt, R. E. A., & Hong, J. (2014). Bubble size measurements in a bubbly wake. 67th Annual Meeting of APS-DFD, San Francisco.
  • Arndt, R. E. A., Karn, A. & Hong, J. (2014). A unified physical model to explain supercavity closure. 67th Annual Meeting of APS-DFD, San Francisco
  • Ellis C., Karn, A., Hong, J., Lee, S. J., Kawakami, E., Scott, D., Gulliver, J. & Arndt, R. E. A., (2014). Measurements in the wake of a ventilated hydrofoil: A step towards improved turbine aeration techniques. 27th IAHR Symposium Hydraulic Machinery and Systems, Montreal, Canada.
  • Kawakami, E., Lee, S. J., Karn, A., Hong, J. & Arndt, R. E. A. (2013). Improved performance with ventilation. 66th Annual Meeting of APS-DFD, Pittsburgh.
  • Arndt, R. E. A., Lee, S. J., Kawakami, E., Hong, J. & Karn, A. (2013). Ventilation of a hydrofoil wake. 66th Annual Meeting of APS-DFD, Pittsburgh.
  • Scott, D., Sabourin, M., Beaulieu, S., Ellis, C. & Karn, A. (2015). Optimizing dissolved oxygen transfer in auto-venting turbines. HydroVision International 2015, Portland.
  • Lee, S. J., Kawakami, E., Karn, A., Arndt, R. E. A. (2014). Experimental investigation on the behaviors of ventilated supercavities. Proceedings of the annual autumn meeting of the SNAK (The Society of Naval Architects of Korea), Changwon, Korea, 2014.
  • Zhao J., Han H. S., Karn A., and McMurry P. (2015), Development of an Ultrafine Condensation Particle Counter (UCPC) for Measurements of Particles Down to 1 nm in Diameter, 34th American Association for Aerosol Research Conference, Minneapolis, Minnesota.
  • Karn, A., Aravindan, S. & Singh, V. N., (2011). Metallographic analysis of Polyhedral Indium Zinc Oxide Mesocontainers.International Metallographic contest 2011, American Society of Metals, Aug. 7 – 11, 2011, Nashville, TN.
  • Karn, A., Aravindan, S., Singh, V. N. & Mehta, B. R., (2011). Synthesis, shape evolution and growth mechanism of Polyhedral Indium Zinc Oxide Mesocontainers. International Metallographic contest 2011, American Society of Metals, Aug. 7 – 11, 2011, Nashville, TN.

Projects:

  • Ventilation augmented supercavitation technology(VAST) for next-generation hydropower, Science and Engineering Research Board, Department of Science and Technology as a Principle Investigator (PI) towards Early Career Research Award, Funding amount: Rs. 40.3 lakhs.
  • Novel Strategies to induce bubble coalescence for industrial and naval applications, SEED Research Grant, University of Petroleum and Energy Studies, 2018. (as PI, co-PI: Dr. Abhay Kumar).
  • In-situ monitoring of industrial bubbly flows and bubble size control via continuous feedback approach, SEED Research Grant, University of Petroleum and Energy Studies, 2018. (with PhD student).
  • Conversion of waste sewage sludge to wealth via hydrolysis/methanogenesis and pyrolysis, SEED Research Grant, University of Petroleum and Energy Studies, 2018. (as co-PI, PI: Dr. V Chintala).

Invited Talks:

  • Research Perspectives on extracting Kinetic Hydro Power, ONGC Energy Center, New Delhi, India; Feb 6, 2019.
  • Case Studies on Hydropower Research: American and Indian Perspectives, TATA Power Hydros, Khopoli, Maharashtra, India; Jan 2, 2019.
  • A robust image analysis approach for high void fraction gas-liquid flows, 3rd World Congress on Petrochemistry and Chemical Engineering, Atlanta, USA, Nov. 30 2015.
  • Computational simulations in mechanical engineering Engineering and Technology Department, University of Wisconsin Stout, Menomonie, Wisconsin, USA, March 29 2016.
  • Multiphase flows in fluid machinery, Department of Mechanical Engineering, California State University Fullerton, Los Angeles, California, USA, April 5 2016.
  • Bubbly flow physics for applications in aerated hydroturbines and underwater transport, Department of Fire Protection Engineering, Worcester Polytechnic Institute, Worcester, Massachusets, USA, April 28 2016.
  • Applications of multiphase flows, School of Mechanical, Materials and Energy Engineering, Indian Institute of Technology Ropar, Punjab, India, May 3 2016.
  • Multiphase flows in Turbomachinery, Jaipur Institute of Engineering and Technology, Jaipur, Rajasthan, India, April 2018.

Rewards & Recognitions:

Science and Engineering Research Board (SERB), Department of Science and Technology, India 

Early Career Research Award, 2018.

The University of Petroleum and Energy Studies

  • Research Excellence Award, 2018-2019. 
  • Individual Teaching Excellence Award, 2018-2019.
  • SEED Research project grants for three research projects on thermal-fluid sciences, 2018.

The University of Minnesota, Twin Cities, USA.   

  • Edward Silberman Award, College of Science and Engineering, 2015-2016 (Awarded for excellence in scientific research).
  • Doctoral Dissertation Fellowship, Graduate School, 2015-2016 (Awarded to the selected best dissertations in the graduate school).
  • Preparing Future Faculty Certificate, Graduate School, 2016.
  • Student Fund Award, St. Anthony Falls Laboratory, 2015.
  • DDF Conference Travel Grant, Graduate School, 2015.   
  • Frank and Julie Tsai Travel Award, St. Anthony Falls Laboratory, 2014.9.
  • Mechanical Engineering Departmental Fellowship, 2011-2012.

Indian Institute of Technology Delhi, New Delhi     

BOSS Award for the best hardcore experimental project in Mechanical Engineering, 2011.

National Council for Educational Research and Training, New Delhi, National Talent Search (NTSE) Scholarship for six consecutive years, 2005-2011.

American Society of Metals.                                         

  • Third Place, International Metallographic Contest, 2011. 
  • Honorable Mention, International Metallographic Contest, 2011.