## MIXING TEE-CFD Analysis using Ansys Fluent

MIXING TEE CHALLENGE

CASE 1

Problem Definition: - To setup steady state simulations to compare the mixing effectiveness Of Short mixing tee with hot inlet velocity of 3m/s & Momentum ratio of 2.

Specification of Geometry: -

Pipe Length: -190mm

Diameter of cold inlet Pipe: - 20mm                       Temp of Cold Inlet: - 283K(10°c)

Diameter of Hot Inlet Pipe: - 30 mm                       Temp of Hot Inlet: - 300K(30°c)

Objectives: -

• To measure Cell count for mixing tee,
• To measure Average outlet temperature,
• Define Number of iterations required for convergence.
• To show the convergence plot.
• To cut plane along the middle of the pipe and color it by velocity and temperature.

Geometry: -

Geometry is created using solidowrks software with given specification. In order to import the geometry we have to save geometry in STEP/IGES format .For CFD analysis we need only volume occupied by the fluid medium, to extract the fluid volume from geometry we have to use fill command with cavity option in dropdown menu(used Design modeler).then suppressed the solid geometry imported from solid works & rename the extracted volume as Fluid.

Meshing: -

General meshing with inflation option is selected with element size of 2 mm and smooth transition inflation setting applied with 5 no’s of layers. Using the named selection(N) all the geometry is specified as cold inlet, hot inlet, wall, outlet.

No Of Elements: -141015

No Of Nodes: - 49300

Boundary Conditions: -

Results: -

Above problem has been solved for 500 interation but convergence is reached at 104 interation.

Convergence Plot: -

Average Outlet Temperature plot: -

Velocity Plot @Middle Plane: -

CASE 2

Problem Definition: - To setup steady state simulations to compare the mixing effectiveness Of long mixing tee with hot inlet velocity of 3m/s & Momentum ratio of 2.

Specification of Geometry: -

Pipe Length: -270mm

Diameter of cold inlet Pipe: - 20mm                        Temp of Cold Inlet: - 283K(10°c)

Diameter of Hot Inlet Pipe: - 30 mm                       Temp of Hot Inlet: - 300K(30°c)

Objectives: -

• To measure Cell count for mixing tee,
• To measure Average outlet temperature,
• Define Number of iterations required for convergence.
• To show the convergence plot.
• To cut plane along the middle of the pipe and color it by velocity and temperature.

Geometry: -

Geometry is created using solidowrks software with given specification. In order to import the geometry we have to save geometry in STEP/IGES format .For CFD analysis we need only volume occupied by the fluid medium, to extract the fluid volume from geometry we have to use fill command with cavity option in dropdown menu(used Design modeler).then suppressed the solid geometry imported from solid works & rename the extracted volume as Fluid.

Meshing: -

General meshing with inflation option is selected with element size of 2 mm and smooth transition inflation setting applied with 5 no’s of layers. Using the named selection(N) all the geometry is specified as cold inlet, hot inlet, wall, outlet.

No Of Elements: -186474

No Of Nodes: - 66258

Boundary Conditions: -

Results: -

Above problem has been solved for 150 interation but convergence is reached at 64 interation.

Convergence Plot: -

Average Outlet Temperature plot: -

Velocity Plot @Middle Plane: -

CASE 3

Problem Definition: - To setup steady state simulations to compare the mixing effectiveness Of Short mixing tee with hot inlet velocity of 3m/s & Momentum ratio of 4.

Specification of Geometry: -

Pipe Length: -190mm

Diameter of cold inlet Pipe: - 20mm                    Temp of Cold Inlet: - 283K(10°c)

Diameter of Hot Inlet Pipe: - 30 mm                    Temp of Hot Inlet: - 300K(30°c)

Objectives: -

• To measure Cell count for mixing tee,
• To measure Average outlet temperature,
• Define Number of iterations required for convergence.
• To show the convergence plot.
• To cut plane along the middle of the pipe and color it by velocity and temperature.

Geometry: -

Geometry is created using solidowrks software with given specification. In order to import the geometry we have to save geometry in STEP/IGES format .For CFD analysis we need only volume occupied by the fluid medium, to extract the fluid volume from geometry we have to use fill command with cavity option in dropdown menu(used Design modeler).then suppressed the solid geometry imported from solid works & rename the extracted volume as Fluid.

Meshing: -

General meshing with inflation option is selected with element size of 2 mm and smooth transition inflation setting applied with 5 no’s of layers. Using the named selection(N) all the geometry is specified as cold inlet, hot inlet, wall, outlet.

No Of Elements: -141015

No Of Nodes: - 49300

Boundary Conditions: -

Results: -

Above problem has been solved for 200 interation but convergence is reached at 109 interation.

Convergence Plot: -

Average Outlet Temperature plot: -

Velocity Plot @Middle Plane: -

Temperature at outlet for above 3 cases:

Volume Rendering for 3 Cases:

case 1

case 2

Case 3

Animation showing mixing of cold and fluid with velocity plot:-

 Serial No CASE Temp @ Outlet 1 CASE 1 294.4 2 CASE 2 294.44133 3 CASE 3 291.54

From above table we can conclude that as the length of pipe increase their is  negligible change happening at outlet but as cold fluid velocity increase’s there is large amount of temperature lost occurs. i.e for proper mixing velocity at cold inlet should be large as compared to inlet velocity of hot fluid

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