calculate pipe friction loss
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common pipeline losses and their calculation methods
1. friction loss
friction loss refers to the energy loss caused by the friction of the pipe wall when the fluid flows in the pipe. pipe friction losses can be calculated using the darcy-weisbach formula:
hf=fL/D×V^2/(2g)
among them, hf is the pressure loss in the pipeline, f is the friction coefficient, l is the length of the pipeline, d is the diameter of the pipeline, v is the flow velocity, and g is the acceleration gravity.
2. elbow loss
elbow loss refers to the energy loss generated when the fluid flows through the elbow. according to the ratio of the radius of curvature of the elbow to the diameter of the pipe, the elbow is divided into long radius elbow and short radius elbow. elbow loss can be calculated using the following formula:
hL=(K×V^2)/(2g)
among them, hl is the elbow loss, k is the elbow coefficient, v is the flow velocity, and g is the gravity acceleration.
3. valve loss
valve loss refers to the loss of liquid energy caused by the valve itself when the fluid passes through the valve. valve losses can be calculated using the following formula:
hL=(Kv^2)/(2g)
among them, hl is the valve loss, kv is the valve flow coefficient, and g is the gravity acceleration.
4. other losses
in addition to the above three types of losses, there are other forms of losses in pipelines, such as pipeline inlet losses, pipeline outlet losses, wall friction losses, etc. these losses can be calculated through corresponding calculation formulas.
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