Tubing Flow

Tubing Flow

Resistance to Flow in Tubing

The Lohm Laws accurately relate flow, pressure drop, and Lohm rating for individual components. For tubing, however, these variables are best related in graph form. The following graphs show pressure drop and flow rate for four different standard sizes of tubing offered by The Lee Company. A 10 cm length of tubing is used in the graphs. If your flow problem involves longer tubing length, increase the pressure drop proportionately.

Example:
To find the pressure drop for a 30 cm length of Lee Company standard 0.032" I.D. tubing flowing 100 mL/min. of water, begin by consulting the water flow graph. From the graph, you determine that the pressure drop is 4 psia for a 100 mL/min. flow rate. Adjust this to your length of 30 cm by ratio:

Due to slight variations that normally occur in the tubing I.D., these flow calculations for tubing are not exact, but are useful for most design work.

Tubing Flow Curves – Water Flow

For 10 cm Tube Length

Tubing Flow Curves – Air Flow

For 10 cm Tube Length


Tubing Volume vs. Length

 

 

 

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