Orifice flow coefficient of orifice flowmeter| turbine water meter

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1. How to calculate the outflow coefficient c of an orifice flowmeter?

The fluid filled in the pipeline flows through the throttling device inside the pipeline, causing local contraction near the throttling element, increasing the flow velocity, and creating a static pressure difference on both sides upstream and downstream. Under the condition of known parameters, the relationship between differential pressure and flow rate can be derived based on the principle of flow continuity and Bernoulli equation to obtain the flow rate. The basic formula is as follows: c - Non dimensional outflow coefficient d - Diameter of the throttling hole or throat of the throttling element under working conditions D - Inner diameter of the upstream pipeline under working conditions qm - Mass flow rate Kg/sqv - Volume flow rate m ³/s ß - Diameter ratio d/D Non dimensional fluid coarse combustion density Kg/m ³ Scalability coefficient Search Non dimensional Jinhu Feiyun Instrument

2. Chemical principles The pore flow coefficient

The pore flow coefficient is closely related to the flow velocity, viscosity, and density of the fluid. To ensure measurement accuracy, it is necessary to ensure that the positioning of the throat hole is accurate and error free during installation. By directly adjusting and increasing the flow rate of the rotor flowmeter, the accuracy of the experiment can be improved. During the outflow process, if the water head acting on the orifice remains constant and the outflow velocity and flow rate do not change over time, this situation is referred to as constant orifice flow. Otherwise, it is a non constant orifice flow. Common orifice shapes include rectangular and circular. When the ratio of the

Orifice flow coefficient of orifice flowmeter

height of the orifice to the head of the orifice, e/H, reaches 0.1, it can be considered a large orifice. When using an orifice flowmeter to measure ammonia flow rate, if the design pressure is 0.2mpa (gauge pressure) and the temperature is 20 ℃, but the actual pressure is 0.15mpa (gauge pressure) and the temperature is 30 ℃, the actual indicated flow rate will decrease by about 10.3% compared to the design flow rate. The length of the straight pipe section in front of the orifice plate should generally be 10 times the diameter of the orifice plate, while the length of the straight pipe section behind the orifice plate should be 5 times. In order to obtain more accurate measurement results, especially when there is a pump or regulating valve in front of the orifice plate, it is recommended that the length of the straight pipe section in front of the orifice plate be between 30 and 50 times the diameter of the orifice plate. The pore flow coefficient is widely used in fluid mechanics, especially in industries such as chemical, petroleum, and natural gas. Proper installation and calibration are key to ensuring measurement accuracy. Orifice flow meters have been widely used in many industrial applications due to their simple structure, low cost, and wide measurement range. However, the measurement accuracy of orifice flow meters is affected by various factors, including the properties of the fluid, the size of the orifice plate, the length of the straight pipe section of the pipeline, and installation conditions. The orifice flow coefficient may vary for different shapes of orifices. For example, the flow coefficient of a circular orifice is usually larger than that of a rectangular orifice. Therefore, when selecting the sh

Orifice flow coefficient of orifice flowmeter

1. How to calculate the outflow coefficient c of an orifice flowmeter?

2. Chemical principles The pore flow coefficient

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