Week 1- Mixing Tee

AIM : ANALYZING THE MIXTURE OF HOT & COLD AIR IN T – SHAPE PIPE.

INTRODUCTION - To check the effectiveness of the air mixture in T shape – mixture section by using the mathematical models and physical condition to the different geometry models . By using the ansys tools we will generate the graphs, contour for the given geometry. From this we can get the mixture of 2 different substance in 1 section . physical variable like temperature, velocity can change to see more effective output . practical example like AC Ducts, gas welding torch , steam boilers, gas generators etc .

Solving & Modelling approach-

Taking the two different 3D models :- 1 . Short mixing tee & Long mixing tee

First opening the work bench then add the fluent tool. Click on the geometry open via space claim . Upload the geometry model to it from file menu. Go to the prepare option select the volume extract.select the all edges then click on tick mark ,we will generate the inner volume of the 3d geometry . Select the structure tree then click left option in mouse .drop down will show the suppress the model. Deselect the shell in the tree to check the newly generated volume.

CASE-1

MIXTURE SHORT TEE :-

Geometry & suppressed

Pre-processing and solver setting :-

Giving the names to the geometry like - Inlet , outlet, walls.

Mesh & Section plane Generated on the Geometry :

Checking the mesh quality :

Applying the physical condition to the geometry

Pressure based , absolute , steady ,K-epsilon

Momentum ratio of 2

Short tee mixture	Velocity	Temperature
Inlet-x -hot	3m/s	36 C
Inlet -y-cold	6m/s	19 C
outlet		30.2 C (from plots)

As we see above are generating the same pattern of plot after the 200 iteration .

Standard deviation of temperature . the constant line after the 55 iteration deviation between the 1.6 -1.3 .

Area weighted average temperature outlet is dropped from 30.75 C to 32.25 C.

Results :

Contour plot along the section of geometry

Pressure based , absolute , steady ,K-OMEGA- SST

Momentum ratio of 4

Short tee mixture	velocity	Temperature
Inlet-x -hot	3m/s	36 c
Inlet -y-cold	12 m/s	19 c
outlet		27.5C

As we see above are generating the same pattern of plot after the 150 iteration .

Area weighted average temperature outlet is dropped from 28 C to 27 C.

Standard deviation of temperature . the constant line after the 45 iteration deviation between the 1-0.8 .

Contour plot along the section of geometry.

Contour plot across the section of geometry.

CASE-2

MIXTURE TEE LONG :-

Geometry & suppressed

Mesh , Section plane & mesh quality Generated on the Geometry :

Applying the physical condition to the geometry :

Pressure based , absolute , steady ,K-epsilon

Momentum ratio of 2

Short tee mixture	Velocity	Temperature
Inlet-x -hot	3m/s	36 C
Inlet -y-cold	6m/s	19 C
outlet		30.2 C

As we see above are generating the same pattern of plot after the 140 iteration .

Area weighted average temperature outlet is dropped from 28 C to 27 C.

Standard deviation of temperature . the constant line after the 45 iteration deviation between the 1-0.8 .

Contour plot along the section of geometry.

Contour plot across the section of geometry.

Pressure based , absolute , steady ,K-OMEGA- SST

Momentum ratio of 4

Short tee mixture	velocity	Temperature
Inlet-x -hot	3m/s	36 c
Inlet -y-cold	12 m/s	19 c
outlet		29

As we see above are generating the same pattern of plot after the 140 iteration .

Area weighted average temperature outlet is dropped from 28 C to 27 C.

Standard deviation of temperature . the constant line after the 45 iteration deviation between the -0.4-0.6 .

Contour plot along the section of geometry.

Contour plot across the section of geometry.

	Short Tee		Long Tee
	Momentum Ratio -2	Momentum Ratio -4	Momentum Ratio -2	Momentum Ratio -4
Cell count	12613	12613	15530	15530
Average out let temperature	30.2C	27.5C	30.2 C	27.5 C
No of iterations	300	300	300	300

Conclusion:-

After the evaluation of 2 different cases in a CFD tool .

Mixture of the 2 different velocity and temperature mixture for the cold & hot . k-omega , SST model stand good compare to the k epsilon model stand good at momentum ratio -4 as per the result and plot .