friction pressure loss的意思|示意

'

Friction Pressure Loss

Friction pressure loss is a common phenomenon encountered when flowing liquids through pipes or tubes. It is referred to as a pressure drop, or a decrease in pressure along the length of pipe, that occurs as a result of friction between the liquid and the pipe wall. The friction pressure loss is directly proportional to the length of the pipe, the diameter of the pipe, and the rate of flow.

When fluid is forced to flow through a pipe, it has to exert extra pressure to overcome frictional resistance. This frictional resistance is due to the roughness of the internal surface of the pipe and the flow velocity of the liquid. The liquid particles, while flowing inside the pipe, come in contact with the internal surface of the pipe walls, and the force of their contact creates a frictional resistance. This resistance slows down the flow of the liquid, decreasing the total pressure along the length of the pipe.

The equation for friction pressure loss can be expressed as:

friction pressure loss = (ρ x v2)/(2γ x l)

Where:

ρ = density of the fluid

v = velocity of the fluid

γ = friction coefficient of the pipe

l = length of the pipe

The friction coefficient of the pipe is related to the roughness of the pipe and the Reynolds number. As the Reynolds number increases, so does the friction coefficient. In other words, a higher velocity and a rougher surface result in a higher friction coefficient.

Friction pressure loss is an important factor to consider during the design of a pipe system. It can affect the flow rate and pressure of the system and can have a significant impact on the overall operation of the pipe system. It is important to select the right pipe size and materials that can minimize friction losses, as this can reduce energy costs and improve the efficiency of the pipe system.