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1. How to calculate the flow rate of water
The formula for calculating the flow rate of water is Q=Sv, and the unit can be m ^ 3/s or L/s. The following is a detailed explanation of the calculation of water flow rate: Definition: Water flow rate refers to the volume of fluid passing through a cross-section of a pipeline or open channel per unit time, also known as instantaneous flow rate. Formula: Q=Sv, where S is the cross-sectional area and v is the water flow velocity. Unit: Common units include cubic meters per second or liters per second. The formula for calculating this is 1 m ^ 3/s=1000 L/s. Calculation process: For a circular pipeline, it can be imagined that the volume of water is a cylinder, with the cylinder volume V=bottom area S × height H. Here, the bottom area is the area of the cross-section of the pipeline, S, and height H=water flow velocity v × time t. Since it is a unit time, time t is considered to be 1, so flow rate Q=SH=Svt=Svt=Sv × 1=Sv. For square, trapezoidal, or other cross-sections, the flow rate calculation method is the same, but the method of calculating area S is different, which requires specific analysis. Attention: When calculating, it is necessary to ensure that the cross-sectional area and the unit of water flow velocity used are consistent in order to obtain the correct flow unit. For different pipeline shapes, different area calculation formulas need to be used to calculate the cross-sectional area S.
2. Two open channels with the same bottom slope, bottom width, and roughness also pass through the same flow rate, but with different cross-sectional shapes The normal water depth in these two open channels is not equal. Taking the isosceles trapezoid as an example, t
(1) In the left side of the above equation, the bottom edge b is also a constant, and the variables include m and collision. Holding two different slope coefficients m corresponds to different positive water depths h. Therefore, the slope coefficient m is different (with different shapes), and the normal water depth h is also the same. For channels that are not isosceles trapezoids, the wax key in equation (1) can be expressed as: f (shape, h)=nQ/√ i=constant or different shapes have different normal water depths.
3. Hydraulics (5th edition) Important Formula Compilation Chapter 6 Open Channel Flow
The important formulas for open channel flow in Chapter 6 are summarized as follows: Hydraulic radius formula: Definition: Hydraulic radius is an important parameter for measuring flow velocity distribution, which is related to the cross-sectional area and wetted circumference of the water passage.
. Formula: $R=frac {A} {P} $, where $R $is hydraulic radius, $A $is cross-sectional area, and $P $is wetted perimeter. Flow formula: Definition: Flow represents the volume of fluid passing through a certain section per unit time. Formula: $Q=Av $, where $Q $is flow rate, $A $is cross-sectional area, and $v $is flow velocity. In a trapezoidal cross-section, the flow modulus can be used to balance the relationship between flow rate and the optimal trapezoidal hydraulic cross-section. Microwave velocity formula: Definition: Microwave velocity excitation is the flow velocity at average water
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