Talking about the design of practical elbow throttling parts of elbow flow meter

Abstract: A brief discussion on the design of practical elbow throttling parts for elbow flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. At present, the elbow flowmeter produced by many elbow flowmeter manufacturers is a 90-degree elbow with standard geometric dimensions, and the construction party who installs the throttling part often installs the elbow directly in a suitable space, but The flow measurement effect is not very good. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. At present, the elbow flowmeter produced by many elbow flowmeter manufacturers is a 90-degree elbow with standard geometric dimensions, and the construction party who installs the throttling part often installs the elbow directly in a suitable space, but The flow measurement effect is not very satisfactory. After investigation and analysis by the project team, there are two modes of operation of the fluid inside the elbow, one is the free swirl theory and the other is the forced swirl theory. When the liquid enters the elbow, it is forced to do a similar circular motion, this“forced”It is the forced swirl theory method. In order to understand the distribution of velocity and pressure inside the elbow in the forced swirling state, the project team checked the data, consulted experts, and finally learned that before the fluid entered the elbow, there had already appeared near the inner side of the elbow and the outer side of the elbow. The subtle changes in the velocity and pressure of the fluid, as it gradually enters the elbow, the pressure changes exponentially, that is, the flow velocity near the inner side of the elbow gradually increases slowly, while the pressure increases exponentially. The flow velocity near the outside of the elbow gradually decreases, and the pressure also decreases exponentially; when the fluid enters the geometric 45-degree section of the elbow, the velocity of the fluid near the inside is the largest, and the pressure at this time is also the largest. On the contrary, the fluid on the outside The velocity is the smallest, and the pressure at this time is also the smallest; when the 45-degree section is crossed, the change is reversed before the section; when the fluid flows out of the elbow, the velocity gradient will continue for a period of time, and the velocity and pressure will return to the inlet Steady state before bending. After rigorous analysis, it is concluded that the fluid velocity and pressure do not change outside the range of 5 times the diameter of the elbow before the fluid enters the elbow, but there are changes within 5 times the diameter; the fluid flows out of the elbow within the range of 2 times the diameter of the elbow In addition, the fluid velocity and pressure return to the physical state before 5 times the diameter of the elbow before entering the elbow, and the change is obvious within the range of 2 times the diameter of the elbow. Therefore, the diameter of the elbow is D, then the throttling part of the practical elbow flowmeter should be: a 90-degree elbow with standard geometric dimensions, the elbow inlet must have a 5D straight pipe section, and the elbow outlet must have a 2D straight pipe. There is a pressure-taking hole on the inside and outside of the 45-degree section of the pipe section. The design drawing of the elbow flowmeter and the parameters of the flow system are handed over to the elbow flowmeter manufacturer for manufacturing, and then the installation department is supervised for installation. The bend diameter ratio (R/D) is preferably 0.95 to 1.95. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'On the Design of Practical Elbow Throttling Parts of Elbow Flow Meters'

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