To analyze the effects of inlet velocities and inlet temperatures of fluid on the final outlet fluid in a mixing Tee Geometry.
Aim/Objective: To analyze the effects of inlet velocities and inlet temperatures of fluid on the final outlet fluid in a mixing Tee Geometry.
Introduction: A mixing tee is a device used in many chemical diffusion/mixing processes and in applications such as air conditioners for mixing of fresh and return air. Mixing Tees are a simple method of installing an injection point in an existing piping system. Mixing Tees are a simple, cost-effective method of providing chemical diffusion to a system. In many cases, the mixing tee can be installed with little or no piping modification.
Dimensions:
The geometry is as shown below and the dimensions are:
Length of the Hot Inlet pipe = 100 cm
The diameter of Hot Inlet Pipe = 20 cm
Length of Cold Inlet Pipe = 25 cm
The diameter of Cold Inlet Pipe = 15 cm
Distance between Inlet of Hot Fluid and Entry of Cold Fluid = 20 cm
Fluid under consideration : Water
Procedure:
We perform two parametric studies
1) To study the effect of variation of inlet speeds at constant inlet temperatures as 240 Kelvin and 323 K for cold and hot inlets respectively.
- With 10 m/s at Hot inlet and 10 m/s at Cold Inlet
- With 20 m/s at Hot inlet and 20 m/s at Cold Inlet
- With 05 m/s at Hot inlet and 05 m/s at Cold Inlet
- With 10 m/s atHot inlet and 05 m/s at Cold Inlet
- With 05 m/s at Hot inlet and 10 m/s at Cold Inlet
2) To study the effect of variation of inlet temperatures of fluids at constant inlet velocities of 10m/s at both inlets
- With 323 K at Hot inlet and 240 K at Cold Inlet
- With 348 K at Hot inlet and 240 K at Cold Inlet
- With 323 K at Hot inlet and 265 K at Cold Inlet
- With 348 K at Hot inlet and 265 K at Cold Inlet
The mesh for the geometry was refined to automatic level 5 as is shown below:
Results:
1) To study the effect of variation of inlet speeds at constant inlet temperatures as 240 Kelvin and 323 K for cold and hot inlets respectively
With 10 m/s at Hot inlet and 10 m/s at Cold Inlet
Cut Plot Front Plane
Cut Plot Right Plane
With 20 m/s at Hot inlet and 20 m/s at Cold Inlet
Cut Plots and Surface Plot
Cut Plot Front Plane
Cut Plot Right Plane
With 05 m/s at Hot inlet and 05 m/s at Cold Inlet
Cut Plots and Surface Plot
Cut Plot Front Plane
Cut Plot Right Plane
With 10 m/s atHot inlet and 05 m/s at Cold Inlet
Cut Plots and Surface Plot
Cut Plot Front Plane
Cut Plot Right Plane
With 05 m/s at Hot inlet and 10 m/s at Cold Inlet
Cut Plots and Surface Plot
Cut Plot Front Plane
Cut Plot Right Plane
2) To study the effect of variation of inlet temperatures of fluids at constant inlet velocities of 10m/s at both inlets
With 323 K at Hot inlet and 240 K at Cold Inlet
Cut Plots and Surface Plot
Cut Plot Front Plane
Cut Plot Right Plane
With 348 K at Hot inlet and 240 K at Cold Inlet
Cut Plots and Surface Plot
Cut Plot Front Plane
Cut Plot Right Plane
With 323 K at Hot inlet and 265 K at Cold Inlet
Cut Plots and Surface Plot
Cut Plot Front Plane
Cut Plot Right Plane
With 348 K at Hot inlet and 265 K at Cold Inlet
Cut Plots and Surface Plot
Cut Plot Front Plane
Cut Plot Right Plane
Observations:
1) Effect of variation of inlet speeds at constant inlet temperatures as 240 Kelvin and 323 K for cold and hot inlets respectively
A) Front Planes
b) Right Planes
c) Data
2) Effect of variation of inlet temperatures of fluids at constant inlet velocities of 10m/s at both inlets
1) Front Plane
2)Right Plane
3) Data
Conclusions:
1) From the data table, it is clearly visible that there is no effect of inlet velocity on maximum and minimum temperature of the fluid and temperature distribution at the outlet as soon as inlet velocities of both hot and cold water are equal.
2) As a difference in inlet velocities is created the temperature distribution at the outlet is changed as shown in the cut plots.
3) From the data table, it is visible that there is no effect of temperature difference of inlet and outlet temperatures on the temperature distribution pattern on the outlet as shown in the front plane cut plots.
4) However, it is visible from the data table that as the difference between the hot and cold liquids is decreases the avg. temp of the fluid is nearly equal to the avg temp. of both the fluid however, if the temperature difference is increased the avg temp of the fluid shifts towards the temperature of the hot inlet.