Module 3: Physics of Combustion
  Lecture 17: Transport in Turbulent Flow
 


Transport in Turbulent Flow

Turbulent Flow:

  • At high Reynolds and Grashof's number, the properties, velocity and temperature exhibits random variation.
  • Eddies move randomly back and forth across the adjacent fluid layers.
  • Turbulence reduces the B.L. thickness.
  • Enhanced mass, momentum, and energy transfer rates.


(Figure 17.1)
Where, – Time averaged value of velocity
  – Fluctuating component of velocity
Turbulent diffusivity is given by,
 
 
   
     
(Figure 17.2)