# Can someone help calculate pressure drop ?

• dilipbhanu
In summary, calculating pressure drop involves using the Darcy-Weisbach equation, which takes into account factors such as fluid velocity, pipe diameter, and frictional losses. It is necessary in various engineering and scientific applications, such as determining the flow rate of a fluid through a system. The calculation process can be complex and may require knowledge of fluid dynamics and mathematical equations, but there are online calculators and software available to aid in the process. Additionally, accurate pressure drop calculations are crucial for ensuring efficient and safe operation of systems that involve fluid flow.
dilipbhanu
I am a non technical innovator trying to develop a new product. Can someone help me calculate pressure drop and flowrate across a cylinder packed with uniform spheres of 10mm diameter.

I found this online but unable to calculate: https://neutrium.net/fluid_flow/pressure-drop-through-a-packed-bed/

Fluid: Air
Required flowrate: 500 CFM
Inlet Pressure: 4 to 12 inches water column
Outlet Pressure: Atmosphere
Cylinder size: 12 inch diameter
Cylinder height: 12 inches
Packed Spheres diameter: 10mm (attached is a reference of how the media is packed)

What should be the required inlet pressure to achieve a flow rate of 500 CFM ?
or
What will be the flow rate of inlet pressure is 4 inches water column ?

Earliest help/assistance appreciated. Thank you

#### Attachments

• packed media.jpg
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• packed media chamber.jpg
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Bed voidage and friction factor is confusing me

Bed voidage is around 0.26 (stacking spheres ) and the friction factor is what comes out (you'll note that it does not occur in the equation in section 5) .
5.1 is just a matter of rewriting the same thing

## 1. What is pressure drop?

Pressure drop is the decrease in pressure that occurs when a fluid flows through a pipe or other channel. It is caused by resistance to flow, such as friction or changes in the pipe's geometry.

## 2. How do you calculate pressure drop?

Pressure drop can be calculated using the Darcy-Weisbach equation, which takes into account factors such as fluid properties, flow rate, pipe dimensions, and roughness. There are also online calculators and software programs available to assist with this calculation.

## 3. Why is pressure drop important to consider?

Pressure drop is important to consider in many engineering and industrial applications, as it can affect the efficiency and performance of systems. For example, in HVAC systems, pressure drop can impact the airflow and temperature control, while in pipelines, it can affect the flow rate and delivery of fluids.

## 4. What are some factors that can affect pressure drop?

Some factors that can affect pressure drop include fluid properties (such as viscosity and density), flow rate, pipe diameter, pipe roughness, and any obstructions or changes in the pipe's geometry. Temperature and the type of fluid being transported can also play a role.

## 5. How can pressure drop be reduced?

Pressure drop can be reduced by increasing the pipe diameter, smoothing the interior surface of the pipe, reducing fluid viscosity, or decreasing the flow rate. In some cases, adding pumps or compressors can also help to maintain desired pressure levels. Proper maintenance, such as cleaning and repairing any obstructions or leaks, can also help to reduce pressure drop.

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