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You can select one or several keywords below to retrieve relevant information. Weightless weighing can also be clicked immediately“Retrieve material”Search all puzzles. Q=Sv=constant.
(S is the total cross-sectional area, v is the water velocity) (Q=AV is used in hydrodynamics), and the enterprise is cubic per second. The precise measurement of the total flow of fluid mechanics in a certain safe passage is generally called a flow meter. The fluid mechanics of flow measurement is diversified. For example, the precise measurement targets include gas, liquid, and mixed fluid mechanics; the temperature, working pressure, and total flow of fluid mechanics are very different, and the specified precise measurement accuracy is not enough. same.
Therefore, the daily task of flow measurement is to scientifically research various relative measurement methods according to the precise measurement purpose, the type of fluid mechanics to be measured, the fluidity situation, the precise measurement site and other precise measurement standards, and to ensure the total Proper transmission of flow values. The number of cubes a river passes through a certain point in one second. Generally speaking, the more in the middle and lower reaches, the greater the total flow, so when identifying the direction of the river on the map, it is generally narrow to wide.
The total flow of the river refers to the water flow of a certain cross-section (section) of the river per unit time, and is generally expressed in cubic meters per second. The total flow can also be expressed by the total water flow out of a month, a season, and a year. From the perspective of hydrology, the total flow should be: according to the water quality volume of a certain blanching water cross-section per unit time, the common enterprise is cubic per second, and it is mostly used to measure the inflow and outflow of the cross-section of the lake in rivers and weightlessness. Measurement, the measurement method of total flow, from the perspective of hydrological station, can be divided into buoy method, weightless flowmeter method, ultrasonic method, etc. The flowmeter method measures the accuracy.
The pipe flow calculation formula calculates the known pipe with a nominal diameter of 12mm, a diameter of 14mm, and a dimensional tolerance of 13mm in diameter, and the water output of the fan coil is obtained by weightless weighing. The working pressure is the working pressure of the urban water supply. Pipeline flow calculation formula calculation 1: 1/4∏×The square meter of pipe diameter (mm unit is converted into meter unit)×The water flow for economic development (1.1m/s for pipes below DN300 and 1.5m/s for pipes above DN300) is actually calculated by the same two formulas, only the descriptions are different.
In addition, the water output is also closely related to the pressure, but now people can at least measure the approximate water output. Because the tube wall of the metal hose is too thin, the diameter of the tube is the same as the nominal diameter of the tube, so the average value of the diameter of the tube and the nominal diameter of the tube is taken as the tube diameter.
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