Spray Drying Chamber CFD Simulation by Ansys Fluent

Description

Spray Drying Chamber, CFD Simulation Ansys Fluent Software

In this project, which has been done by CFD numerical simulation method with the help of Ansys Fluent software, The spray drying chamber is simulated by the two-way dpm & Species Transport model. The particle diameter is 1 mm, and the flow moves at a speed of 1 m/s.

Geometry & Mesh

The 3-D geometry of the present model is carried out using Spaceclaim software. The length of the computational domain is 2.2 m and its height is 3.84m.

The meshing of this present model has been generated by ANSYS Meshing software. The mesh type is unstructured, and the total cell number is 258311.

Spray Drying CFD Simulation

To simulate the present model, we consider several assumptions:

• The solver is pressure-based.
• The present simulation is unsteady in terms of time.
• The gravity effect is equivalent to -9.81 m.s-1.

Here is a summary of the steps for defining the problem and its solution in the following table:

Models
Viscous model		K-epsilon realizable
Discrete phase		on
	particle treatment	unsteady particle tracking
	material in injection	Water_liquid
	particle type in injection	droplet
	injection type	surface
Boundary conditions
Inlet	Draying_air	Velocity inlet
	velocity magnitude	6 m.s-1
	discrete phase BC type	Escape
	Thermal	468.15k
	feed	Mass_flow_inlet
	Mass flow rate	0.0116kg/s
	Thermal	300k
	discrete phase BC type	Escape
Outlet		Pressure outlet
	gauge pressure	-150 Pascal
	discrete phase BC type	escape
walls		Wall
	wall motion	stationary wall
	discrete phase BC type	reflect
Solution Methods
Pressure-velocity coupling		simple
Spatial discretization	pressure	second-order
	momentum	second-order upwind
	Modified turbulent viscosity	first-order upwind
	Initialization
Initialization method		hybrid

Results

In this simulation, a spray dryer chamber is simulated. Due to the water droplets entering as particles and the heat transfer, the water droplets evaporate over time, and their diameter becomes smaller, which indicates the Spray Drying device performance.