If the substance is a liquid and its volumetric density is known the calculator will also output the mass flow rate (more information is required to calculate it for gases and it is currently not supported). This pipe flow rate calculator calculates the volumetric flow rate ( discharge rate) a gas or fluid (liquid) going through a round or rectangular pipe of known dimensions. Flow rate formula via pressure difference.Various other devices essentially measure the fluid velocity, from which the flowrate can be derived. The venturi meter uses a constriction in a pipe to provide a small amount of resistance to the flow and then uses a manometer to measure the pressure difference. Turbine flow meters have a small turbine that drives a generator to indicate the flowrate. These can be used where precise measurement is required because the fluid is being metered (e.g. An important category is the positive displacement devices that repeatedly fill a vessel. Many other devices have been devised for measuring volumetric flowrate. A variety of other devices exist that work on a similar principle of a variable flow area. An automatic version may have a light source and a light detecting device for remote measurement. The float is often designed to spin with due to the fluid flow which reduces the chance of it getting stuck at low flow rates (or at least makes it obvious if it has done so), and because of this the device is known as a rotameter. In its simplest form it is comprised of a tube, and a tapered float which rises or falls depending on the flow. Measuring Volumetric Flow RateĪ fluid flow meter is a device used for measuring the rate of fluid flow or volumetric flow rate. If the velocity of the fluid through the area is non-planar then the volumetric flow rate must be calculated by using a surface integral. The above equation is for one-dimensional incompressible flows and it is commonly referred to as the continuity equation. When the fluid flow is perpendicular to the area A, the angle θ = 0. Where A is the area of the pipe and ʋ is the uniform velocity of the fluid with an angle θ. When the fluid flows in an angle θ, the volumetric flow rate Q can be calculated as: The volumetric flow rate is given by the integration of a flux over an area. Volumetric flux is represented by the symbol q and its SI units are m 3/(m 2.s) or m/s. As defined by Darcy's law, volumetric flow rate should not be confused with volumetric flux. In fluid dynamics and hygrometry, the volumetric flow rate is the volume of fluid which passes through a given surface per unit time. The SI units for volumetric flow rate are cubic metres per second, although many other units are commonly used depending on the industry, such cubic feet per second or litres per second. Strictly v is a vector, but in internal flows through pipes, for example, there is only one possible flow direction. The volume of fluid that flows past a given cross sectional area per second is Q = A. The volumetric flow rate, Q, can be calculated as the product of the cross-sectional area, A, and the average flow velocity, v. The volumetric flow rate of a system is defined as a measure of the volume of fluid passing a point in the system per unit time.
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