Numerical Simulation of Flow in Cooling Air Jacket of a Spray Dryer

Use of cooling air jacket in spray dryer is a way that would be useful to reduce stickiness of particles on dryer wall. Air flow analysis in this zone, can determine the air flow pattern and heat transfer contour. Simulation has been achieved by computational fluid dynamics (CFD) technique and by using of Fluent 6.1 software. k-ɛ standard model was used to resolve the flow turbulent. Based on the flow path line, air layers have a smooth and harmonic motion to each other so that there is little axial velocity variation. However, the central line of flow has the maximum velocity. In conjunction between cylindrical and conical parts of dryer in the air jacket, there is a bit deviation of flow toward the dryer wall which has been occurred because of changing the air flow direction.

Keywords:

Spray dryer , Cooling air jacket , CFD , Flow Pattern