Capillary Back Pressure Calculator

Calculate Capillary Back Pressure (ΔP)







Formula

The formula to calculate the capillary back pressure (ΔP) is:

\[ \Delta P = \frac{8 \eta L Q}{\pi r^4} \]

Where:

What is Capillary Back Pressure?

Capillary back pressure is the pressure required to drive a fluid through a capillary tube. This pressure is influenced by factors such as the fluid’s viscosity, the length and radius of the capillary, and the flow rate of the fluid. Understanding and calculating capillary back pressure is essential in various scientific and industrial applications, including chromatography, microfluidics, and medical diagnostics.

Example Calculation 1

Let's assume the following values:

Using the formula:

\[ \Delta P = \frac{8 \times 0.001 \times 0.1 \times 0.00001}{\pi \times (0.001)^4} = 2546.4791 \]

The Capillary Back Pressure is 2,546.4791 Pa.

Example Calculation 2

Let's assume the following values:

Using the formula:

\[ \Delta P = \frac{8 \times 0.002 \times 0.2 \times 0.00002}{\pi \times (0.002)^4} = 1273.2395 \]

The Capillary Back Pressure is 1,273.2395 Pa.