Soot Morphology at high pressure using Counter Flow Diffusion Flame



  • Soot morphology at high pressure
    • ​​​Relevance to practical systems
    • Important in improving the previous codes
    • Important for understanding soot formation, growth and oxidation​​
  • Diffusion flame: relevance to diesel engines and gas turbines​
  • Pressure dependence is not available​

Experimental Facility​

  • Ar/Kr Ion Laser with 488, 514.5 and 674.1 nm wavelength​
  • Pressure Vessel provide optical access to collect scattered light from zero to 180 degree
  • Four PMT’s to collect scattering signal simultaneously​
  • Counterflow burner inside the vessel can move in xyz directions​


Experimental Approach

  • Multi-angle multi-wavelength scattering (MAMWS) and extinction in CFDF upto 40 bar
  • Rayleigh Debye Gans-Polydisperse Fractal Aggregate (RDG-PFA) theory to derive information about soot morphology.



Morphology Parameters​

Diameter of primary particle (dp), Radius of gyration (Rg), Number of particles in an aggregate (N), Soot volume fraction (fv), Fractal dimension (Df), Number density (np), Aggregate size distribution (geometric mean (Ng), geometric standard deviation (σg)), refractive index (m)​


  • High Pressure system for soot morphology 
  • Data acquired about soot morphology
    • Upto 40 bars  ​
    • For various gaseous fuels​
    • At different strain rates​
  • Pressure dependence of fv, dp, Df, Rg, N, np, Ng, σg​
  • Pressure dependence of refractive index of soot​