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What is the average value of coefficient of velocity in a submerged orifice?
Wiki User
∙ 9y ago
coefficient of velocity is 0.97
coefficient of discharge is varied from 0.80 to 0.64
coefficient of contraction is 0.64
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Sha Poran Robin 1711...
The average value of the coefficient of velocity for a submerged orifice is typically around 0.97 to 0.99. This value represents the efficiency of the orifice in converting the potential energy of the fluid into kinetic energy.
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∙ 9y agoAn average value of coefficient of velocity is a
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What are Applications of Circular orifice?
An orifice plate is a device used to measure the rate of fluid flow. It uses the same principle as a venture nozzle namely Bernoulli’s principle which says that there is a relationship between the pressure of the fluid and the velocity of the fluid. When the velocity increases, the pressure decreases and vice versa. An orifice plate is basically a thin plate with a hole In the middle. It is usualy placed in a pipe in which fluid flows. As fluid flows through the pipe, It has K.a certain velocity an a certain pressure. When the fluid reaches the orifice plate, with the hole in the middle of the fluid is forced to converge to go through the small hole, the point of maximum converyence actually occurs shortly downstream of the physical orifice, at the so called vena contracta point as it does so the velocity and the pressure changes. Beyond the vena contracta the fluid expands and the velocity and pressure change once again. By measuring the difference in fluid pressure, between the normal pipe section and at the vena contracta, the volume metric and mass flow rates can be obtained from Bernoulli’s equation. By assuming steady-state, compressible, laminar flow in a horizontal pipe negligible frictional losses, Bernoulli’s equation reduces to an equation relating the conversation of energy at two points in the fluid flow or V1=Q/A1 & V2=Q/A2. Slowing for Q and introducing the beta factor β=d2/d1 as well as coefficient of the discharge Cd. And finally introducing the expansion γ to account the compressibility of gasses and the meter coefficient C which is defind as to obtain the final equation for the volumetric flow of the fluid upstream of the orifice. It we consider about the value of coefficient of velocity (Cv). It may be accurated due to the practical errors. In that case we had to control the over flow rate actually. The top level of a adjustable over flow pipe was decreased gradually. So we had to hold it during the experiment to make the head constant. There may be some errors in measuring time, also we calculated to value of the Q using the equation Q=V/t, the Q2=V2/t2. If there is any error in time. If will increase when “t” become “t2”. So then there may be errors in values of Cd of the first part of experiment. In practically orifice is used in channels, pipelines, canal or hydro power stations to act as a water controller. Mostly those orifice are used to in reservoirs and pipelines. It may be used for measuring the rate of flow out of the reservoirs or through a pipelines, orifice may be in the wall or in bottom of the reservoir or tank . The orifice equation describes the rate of flow of liquid through an orifice. The equation can be represented as: Q = Cd A\sqrt{2gh} where Q = flow (cubic metres per second) C(d) = coefficient of discharge A = area of orifice (square metres) g = acceleration from gravity (9.81 m/s) h = head acting on the centreline (m) For a circular orifice, the equation becomes: Q = Cd (1/4 \pi D^2)\sqrt{2gh} Typical values for the coefficient of discharge are: Sharp orifice: 0.62 Tube: 0.80
What are the factors that affect the value of coefficient of discharge?
Factors that affect the value of coefficient of discharge include the geometry of the orifice or nozzle, roughness of the opening, fluid properties such as viscosity and density, and the flow regime (e.g., laminar or turbulent flow). Additionally, the presence of obstructions or inlet/outlet conditions can also impact the coefficient of discharge.
Why Cd value is high in nozzle meter than orifice meter?
The Cd value (coefficient of discharge) is typically higher in a nozzle meter compared to an orifice meter because the flow profile and pressure recovery characteristics are better in a nozzle meter. Nozzle meters have a converging-diverging shape, which helps in minimizing energy losses and improving the accuracy of flow measurement when compared to an orifice meter design.
What is orifice in fluid mechanics?
An orifice in fluid mechanics is a small opening or hole through which fluid flows. It is typically used in devices such as nozzles, Venturi meters, and orifice plates to measure or control the flow rate of a fluid. The size and shape of the orifice affect the flow characteristics of the fluid passing through it.
What is beta ratio in orifice meter?
The beta ratio in an orifice meter refers to the ratio of the diameter of the orifice plate to the diameter of the pipe in which it is inserted. It is an important parameter in determining the accuracy and performance of the flow measurement. A common beta ratio used in practice is 0.7.
What is submerged orifice?
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Why is coefficient of discharge of venturi meter is more than coefficient of discharge of orifice meter?
In Venturi meter losses are less so coefficient of discharge is higher whereas in orifice meter due to no convergent and divergent cones there are more losses and hence its coefficient of discharge is less.In venturi meter losses are low due to steamline shape of the diffuser and the pressure gradient is not abrupt as in case of orifice meter.
Is coefficient of discharge constant?
No coefficient of discharge is not constant. It is a function of many parameters like :The ratio of the length of the orifice to diameter of orificeReynolds numberflow condition-whether it is increasing or decreasingPressure at the exit of the orifice (back pressure)Orifice entry condition- like smooth entry, sharp edged entry etc.
What are the benefits of practical on flow through circular orifice in constant head method to determine coefficient of discharge?
paniyaram
What are the applications of circular orifice?
Circular orifices are commonly used in flow measurement devices such as orifice plates, venturis, and nozzles. They are also used in pressure relief valves, regulators, and in various industrial processes for controlling or monitoring flow rates of liquids or gases. Additionally, circular orifices can be used in hydraulic systems for controlling fluid flow and creating pressure differentials.
What are Applications of Circular orifice?
An orifice plate is a device used to measure the rate of fluid flow. It uses the same principle as a venture nozzle namely Bernoulli’s principle which says that there is a relationship between the pressure of the fluid and the velocity of the fluid. When the velocity increases, the pressure decreases and vice versa. An orifice plate is basically a thin plate with a hole In the middle. It is usualy placed in a pipe in which fluid flows. As fluid flows through the pipe, It has K.a certain velocity an a certain pressure. When the fluid reaches the orifice plate, with the hole in the middle of the fluid is forced to converge to go through the small hole, the point of maximum converyence actually occurs shortly downstream of the physical orifice, at the so called vena contracta point as it does so the velocity and the pressure changes. Beyond the vena contracta the fluid expands and the velocity and pressure change once again. By measuring the difference in fluid pressure, between the normal pipe section and at the vena contracta, the volume metric and mass flow rates can be obtained from Bernoulli’s equation. By assuming steady-state, compressible, laminar flow in a horizontal pipe negligible frictional losses, Bernoulli’s equation reduces to an equation relating the conversation of energy at two points in the fluid flow or V1=Q/A1 & V2=Q/A2. Slowing for Q and introducing the beta factor β=d2/d1 as well as coefficient of the discharge Cd. And finally introducing the expansion γ to account the compressibility of gasses and the meter coefficient C which is defind as to obtain the final equation for the volumetric flow of the fluid upstream of the orifice. It we consider about the value of coefficient of velocity (Cv). It may be accurated due to the practical errors. In that case we had to control the over flow rate actually. The top level of a adjustable over flow pipe was decreased gradually. So we had to hold it during the experiment to make the head constant. There may be some errors in measuring time, also we calculated to value of the Q using the equation Q=V/t, the Q2=V2/t2. If there is any error in time. If will increase when “t” become “t2”. So then there may be errors in values of Cd of the first part of experiment. In practically orifice is used in channels, pipelines, canal or hydro power stations to act as a water controller. Mostly those orifice are used to in reservoirs and pipelines. It may be used for measuring the rate of flow out of the reservoirs or through a pipelines, orifice may be in the wall or in bottom of the reservoir or tank . The orifice equation describes the rate of flow of liquid through an orifice. The equation can be represented as: Q = Cd A\sqrt{2gh} where Q = flow (cubic metres per second) C(d) = coefficient of discharge A = area of orifice (square metres) g = acceleration from gravity (9.81 m/s) h = head acting on the centreline (m) For a circular orifice, the equation becomes: Q = Cd (1/4 \pi D^2)\sqrt{2gh} Typical values for the coefficient of discharge are: Sharp orifice: 0.62 Tube: 0.80
What are the factors that affect the value of coefficient of discharge?
Factors that affect the value of coefficient of discharge include the geometry of the orifice or nozzle, roughness of the opening, fluid properties such as viscosity and density, and the flow regime (e.g., laminar or turbulent flow). Additionally, the presence of obstructions or inlet/outlet conditions can also impact the coefficient of discharge.
Why Cd value is high in nozzle meter than orifice meter?
The Cd value (coefficient of discharge) is typically higher in a nozzle meter compared to an orifice meter because the flow profile and pressure recovery characteristics are better in a nozzle meter. Nozzle meters have a converging-diverging shape, which helps in minimizing energy losses and improving the accuracy of flow measurement when compared to an orifice meter design.
What is the difference between Restriction Orifice and Flow orifice or please explain the symbols RO Restriction orifice and FO Flow Orifice?
A restriction orifice (RO) is used to limit the flow through the pipe to a set flow by choking the flow at its sonic velocity. A flow orifice (FO) is usually used to determine the flow through the pipe from the pressure drop over the plate. There a normally two pressure taps (one on each side of the plate) and a pressure transmitter which determines the pressure drop over the plate. A formula is then used to convert this pressure drop to a flowrate for the specific fluid passing through the orifice. A FO usually has a temperature element to determine the gas temperature for use is the formula.
What is the working principle of orifice meter?
An obstruction (orifice) is placed in a pipe filled with fluid. The pressure of the fluid is measured at two different points: 1) just upstream of the orifice and, 2) close to the contraction of the fluid (vena contracta). The difference in these two pressures is known as differential pressure. The differential pressure across an obstruction (orifice) in a pipe of fluid is proportional to the square of the velocity of the fluid. Many factors associated with the pipe, orifice and fluid affect the measurement. Satisfactory measurement requires steady-state, homogeneous, turbulent flowing fluids. Other properties which affect the measurement include: the ratio of pipe diameter to orifice diameter and the density, temperature, compressibility and viscosity of the fluid.
Would a laminar flow element a venturi a flow nozzle or an orifice plate produce the smallest total head loss?
The lowest head loss is from a venturi since it has the lowest coefficient of discharge. typical coefficients range from 0.95-0.99 where the higher coefficient is directly proportional to larger square root of Reynolds number.
What is the plural of orifice?
Orifices is the plural of orifice
