# Mixing of two air flow at different pressure

• Devang Marvania
In summary, the question is about how to calculate the final pressure and temperature of air after mixing two sources with different pressures, temperatures, and mass flow rates. The solution involves using Bernoullie's equation twice and treating the two flows separately. The final pressure and temperature can be obtained by calculating the energy exchange between the two flows.
Devang Marvania

Hi Friends! Here is my query :

I have two source of air supply with different pressures, temperatures and with different mass flow rates.
Input 1: P1,T1,m1.
Input 2:P2,T2,m2.
Output: P3,T3,m3.
P,T and m refers to pressure, temperature and mass flow rate respectively. If the mixing is being done in adiabatic way how to obtain final pressure and final temp of air(P3,T3).

I don't know if you still need an answer to this but maybe someone else would like to see an answer too.

You just need to use Bernoullie's equation twice. Once for two of the three sections and another time for two sections from which one must be different than those sections from the first equation. And of course you'll need to have some given pressure and velocities since, obviously, you can't solve a system of two equations with nine unknowns.

Put a control volume around the mixing T. The enthalpy out is equal to the enthalpy in.

You can treat the two flows separately. There is some amount of energy lost by the flow coming in at a higher temperature and gained by the flow coming in at a lower temperature. The temperature of the two are of course, the same after they've mixed. So just calculate how much energy is exchanged so that the temperatures are the same and you have the enthalpy out for each component.

billy_joule

## 1. How does the mixing of two air flows at different pressures occur?

The mixing of two air flows at different pressures occurs when two air streams with different pressure levels come into contact with each other. This can happen when the two air streams are released from separate sources and meet in a confined space, or when one air stream is forced into a different pressure zone.

## 2. What happens to the pressure of the mixed air flow?

The pressure of the mixed air flow will be somewhere between the two initial pressure levels. The exact pressure will depend on the flow rates and velocities of the two air streams, as well as the geometry and conditions of the mixing space.

## 3. How does the temperature of the mixed air flow change?

The temperature of the mixed air flow will also be affected by the mixing process. The temperature will depend on the initial temperatures of the two air streams, as well as the heat transfer that occurs during the mixing process. In some cases, the temperature of the mixed air flow may be higher or lower than the initial temperatures of the individual air streams.

## 4. What factors can influence the mixing of two air flows at different pressures?

There are several factors that can influence the mixing of two air flows at different pressures. These include the velocity and flow rates of the two air streams, the geometry and conditions of the mixing space, and any obstacles or barriers within the mixing area. Additionally, the density and properties of the two air streams can also play a role in the mixing process.

## 5. How is the mixing of two air flows at different pressures used in real-world applications?

The mixing of two air flows at different pressures has numerous applications in various industries. For example, in HVAC systems, air can be mixed at different pressures to achieve a desired temperature and humidity level in a building. In chemical and industrial processes, mixing of air flows at different pressures can be used to create specific chemical reactions or to control the concentration of certain compounds in the air. Additionally, mixing of air flows at different pressures is also used in wind tunnels for aerodynamic testing and in combustion engines for efficient fuel burning.

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