The resistance coefficient of mild steel tube along the pipeline

The resistance coefficient of mild steel tube along the pipeline is generally 0.02~0.04. 1. The concept and calculation method of resistance coefficient

The resistance coefficient refers to the ratio of friction resistance per unit length to kinetic energy loss when water flows through the pipeline, also known as the resistance coefficient along the pipeline. Its calculation formula is:
f=ΔP/(ρv²L/2)
Wherein, f is the resistance coefficient, ΔP is the pressure loss per unit length, ρ is the liquid density, v is the flow rate, and L is the pipeline length. The resistance coefficient under different pipeline materials, shapes, roughness and flow rates can be obtained through experiments or calculations.

2. General value range and influencing factors

As a common pipeline material, the resistance coefficient of mild steel tube at different flow rates generally ranges from 0.02 to 0.04. This range is also affected by many factors such as the roughness of the pipeline material, the size of the pipe diameter, the degree of pipe curvature, and the flow rate of water. Among them, the roughness of the pipeline material is one of the most important factors affecting the resistance coefficient. When the inner wall of the pipe is relatively smooth, water flows easily and the resistance coefficient is relatively small; on the contrary, when the inner wall of the pipe is relatively rough, the friction of the water flow increases and the resistance coefficient is relatively large.

In addition, the curvature of mild steel tube will also affect the resistance coefficient. The greater the curvature, the greater the resistance coefficient. In general, it is recommended that the curvature of the pipe should not exceed 90 degrees to reduce the resistance and pressure loss of the fluid.

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