# Effects of Temperature on Flow Rate

• Abe Rosenberg
In summary, the team is trying to adjust the flow rate so that the pressure corresponds to the same flux for each size of capsule with the same filter media. They believe that thermal expansion of the water is causing the slopes to not overlap, and they are also looking into using the Ergun equation or Darcy's law to calculate the pressure drop.
Abe Rosenberg
Using a pump we are cycling water through a capsule with filter media inside; while measuring the flow rate (l/min) and the pressure (psi) going in and the pressure going out. The water is cycled back into the same storage tank. As the flow rate increases the differential pressure should change linearly, which has been the case.

We have three separate sized canisters with the same filter media inside and each plot of Diff Pressure by flow rate has a R^2 over .995 for each trial we complete. The problem is that the slopes do not overlap as they should. We are adjusting the flow rate to a flux to ensure that the flow rates correspond to the same flux for each size. We believe that since we cannot regulate temperature (although we are monitoring it for each test) that the expansion of water, thus letting the density decrease is causing water to flow slightly faster and thus messing up our slopes, this is the case for even capsules of the same size since we are running trials in triplicate each capsule of the same size is even having a problem having slopes overlap.

We believe thermal expansion of the plastic and media is negligible since the greatest temperature change we observe is ~10*C.

How should we go about correcting for a temperature change in our flow/pressure?

Henryk said:
The slopes depend on geometry and viscosity of water.
The viscosity is temperature dependent and can change 20 % over 10 degrees C.
https://wiki.anton-paar.com/en/water/
Thanks, how can we use these values to correct either our flow rate or pressure?

If you measure the temperature of each test, then the pressure drop should be proportional to the product of flow rate Tims viscosity. Are you taking into account the different lengths and cross sections of the porous media? Are you familiar with the Ergun equation or Darcy's law for flow through porous media?

## What is the relationship between temperature and flow rate?

The relationship between temperature and flow rate is directly proportional. This means that as the temperature increases, the flow rate also increases. Similarly, as the temperature decreases, the flow rate decreases.

## How does temperature affect the viscosity of a fluid?

As the temperature increases, the viscosity of a fluid decreases. This is because the molecules in the fluid have more kinetic energy, causing them to move and flow more easily. As a result, the flow rate also increases.

## What is the impact of temperature on the density of a fluid?

Temperature has an inverse relationship with the density of a fluid. As temperature increases, the density of a fluid decreases. This is because the molecules in the fluid have more energy and move further apart, resulting in a decrease in density.

## How does temperature affect the pressure of a fluid?

Temperature has a direct relationship with the pressure of a fluid. As the temperature increases, the pressure also increases. This is because the molecules in the fluid have more kinetic energy, resulting in more collisions and an increase in pressure.

## What factors can influence the effect of temperature on flow rate?

Aside from temperature, other factors that can influence the effect of temperature on flow rate include the properties of the fluid (such as viscosity and density), the size and shape of the container or pipe, and the type of fluid flow (such as laminar or turbulent).

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