Flow calculation pipe diameter

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1. Flow rate of metering pump

2. Comparison table of pipe diameter, flow rate and flow rate

The comparison table of pipe diameter, flow rate and flow rate is as follows:

(1) When the pipe wall is relatively thin, the difference between the outer diameter and inner diameter of the pipe is almost the same, so the average of the outer diameter and inner diameter of the pipe is taken as the pipe diameter. Generally, for pipes made of synthetic materials or metal, the average of the inner and outer diameters is taken as the pipe diameter when the inner diameter is large.

(2) The displacement per unit time of the flow rate of the liquid. Particle velocity is a vector that describes the direction and speed of motion of a liquid particle at a certain moment. Its direction is consistent with the tangent direction of the particle trajectory. The delay magnitude is: u=lim<△ t → 0>△ s/△ t=ds/dt, in m/s, where △ s is the distance traveled by the liquid particle during △ t time. Due to the distinction between metric (mm) and imperial (inch) units in the extended data:

(1) Based on metric (mm), DN (metric unit)；

(2) NB (inch unit) based on the imperial system (inch);

（3）DN (nominal diameter) ，NB (nominal bore) ，OD (outside diameter) The normal units of flow velocity are m/s and m/h. In hydraulics, liquid motion is often described by focusing on spatial points. The velocity of a liquid particle passing through a certain spatial point is the point velocity u, which is generally a vector function u=u (r, t) of the spatial point position r and time t. In turbulent flow, the point velocity undergoes irregular changes over time. Generally, the average instantaneous velocity over a certain p

3. In water supply design, given the design flow rate, how to calculate the pipe diameter? Hope to provide examples or formulas In water supply design, determining the diameter of the pipeline is one of the key steps, usually requiring knowledge of the design flow rate and velocity. Flow rate refers to the volume of liquid passing through the cross-section of a pipeline per unit time, and is an important parameter for designing pipeline diameter. Firstly, the flow formula Q=V * A can be used, where Q represents the flow rate, V is the velocity, and A is the cross-sectional area of the pipeline. By using the known flow velocity Q, the required flow velocity V can be calculated. To calculate the diameter of the pipeline, we need to determine the cross-sectional area A based on the shape of the pipeline. For circular pipelines, the cross-sectional area A can be calculated by the diameter d, which is A=π d ²/4. Assuming the design flow rate is Q=100 liters/second and the flow velocity V is set to 1.5 meters/second, the pipeline cross-sectional area A can be calculated first. Convert Q=100 liters/second to cubic meters/second, that is, Q=0.1 cubic meters/second. By substituting Q and V into the formula Q=V * A, we obtain 0.1=1.5 * A and solve for A=0.0667 square meters. Due to the circular shape of the pipeline, the diameter d can be calculated using the formula A=π d ²/4. Substituting A=0.0667 into the formula yields 0.0667=π d ²/4, and the solution is d

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