Table of Contents
Is coefficient of discharge constant?
Unlike the flow coefficient, discharge coefficient is dimensionless and almost constant value for any diameter of a single model. For the same high of fluid in the reservoir, higher is the discharge coefficient, higher is the flow rate, therefore the reservoir can be voided at shorter time.
What does coefficient of discharge depend on?
Coefficient of discharge is stated as the ratio between the actual flow discharge and theoretical flow discharge. It has no dimensions and depends directly on the rate of flow and velocity of working fluid. It is symbolized by Cd and its value is different for each fluid depending on the kind of measurement of flow.
Why the coefficient of discharge of orifice meter is less than that of venture 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 …
What is coefficient of discharge of orifice meter?
Explanation: Coefficient of discharge (Cd): It is the ratio of actual discharge to theoretical discharge. As in a pipe, frictional losses are present therefore Qactual will always be less than Qtheoretical.
What are flow device coefficients?
From Wikipedia, the free encyclopedia. The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate.
How is coefficient of discharge calculated?
In Equation (14.18) the discharge coefficient C d = ( 2 / 3 ) ( 2 g / 3 ) = 1.705 in metric units and, in Equation (14.19), C ′ d = ( 2 / 3 ) 2 / 3 = 0.544 in non-dimensional units. If the flow passes through critical depth over a weir crest then it might appear that Cd would always take that value.
Is used to measure the discharge of the liquid?
Detailed Solution. Venturi meter is a device which measures the flow rate of fluid through the pipe. It can be used in any position.
What is the use of determining coefficient of discharge for flow measuring device?
The discharge coefficient is the parameter used to determine the irrecoverable losses across a certain flowmeter or piece of equipment. Keeping track of these losses is important in calculating the efficiency of a system and helps maintain accuracy when taking measurements from various types of flowmeters.
Why coefficient of discharge is always less than 1?
Coefficient of discharge (Cd): It is the ratio of actual discharge to theoretical discharge. As in a pipe, frictional losses are presents therefore Qactual will always be less than Qtheoretical. Its value is always less than 1.
Why do we need discharge coefficient?
The discharge coefficient is a dimensionless number used to characterise the flow and pressure loss behaviour of nozzles and orifices in fluid systems. Orifices and nozzles are typically used to deliberately reduce pressure, restrict flow or to measure flow rate.
Why coefficient of discharge is important?
This parameter is useful for determining the irrecoverable losses associated with a certain piece of equipment (constriction) in a fluid system, or the “resistance” that piece of equipment imposes upon the flow.
What is CV in gas flow?
What is Valve Flow Coefficient (Cv)? Valve Flow Coefficient (Cv) is a valve’s capacity for a liquid or gas to flow through it. It is technically defined as “the volume of water at 60°F (in US gallons) that will flow through a valve per minute with a pressure drop of 1 psi across the valve.”
What is coefficient efficient of discharge?
Co efficient of discharge is nothing but a dimension less number used to characterize the pressure and flow loss due to the geometry and quality of nozzles. It is the ratio of the Amount of water discharged to the amount theoretically possible at that same pressure and same area of discharge.
What is the discharge coefficient of a nozzle?
The discharge coefficient (also known as coefficient of discharge) is the ratio of the actual discharge to the theoretical discharge, i.e., the ratio of the mass flow rate at the discharge end of the nozzle to that of an ideal nozzle which expands an identical working fluid from the same initial conditions to the same exit pressures.
What is the coefficient of discharge of venturimeter?
Generally Coefficient of discharge of venturimeter is 0.95 to 0.97 which is highest of all flow measuring primary transducer’s. Only 10\% of pressure losses are seen in venturimeter while measurement.
What is disdischarge coefficient?
Discharge coefficient is a factor which is incorporated in the equation to take care of head loss due to friction. Therefore, it is reduction of parameter H (head) in the equation. Due to friction actual operating head will be less than the actual head measured and therefore, it is less than one.