# Why do we calculate coefficient of discharge?

## Why do we calculate coefficient of discharge?

In a nozzle or other constriction, the discharge coefficient (also known as coefficient of discharge or efflux coefficient) is the ratio of the actual discharge to the ideal 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 …

## What is the formula for discharge in SI units?

The amount of fluid passing a section of a stream in unit time is called the discharge. If v is the mean velocity and A is the cross sectional area, the discharge Q is defined by Q = Av which is known as volume flow rate. Discharge is also expressed as mass flow rate and weight flow rate.

How do you calculate discharge?

Measuring Discharge Discharge is the volume of water moving down a waterway per unit of time. It is most commonly expressed in cubic feet per seconds or gallons per day. To calculate discharge, multiply the area of water in a channel cross section by the average velocity of water in that cross section.

### What is the coefficient of discharge for a Venturi meter?

The effective discharge coefficient for venturi meters ranges from 0.9 to about unity (Streeter, 1951; American Society of Mechanical Engineers, 1983) with turbulent flow, and it varies with diameter ratio of throat to pipe.

### How do you calculate drainage discharge?

The runoff, Q, for the roof area in drainage Zone A is: (1.00 x 1.5 x 500) / 96.23 = 7.79 gallons per minute. The runoff for the grass portion of drainage Zone A is: (0.35 x 1.5 x 900) / 96.23 = 4.91 gpm.

What is meant by coefficient of discharge CD?

Coefficient of discharge is stated as the ratio between the actual flow discharge and theoretical flow discharge. It is symbolized by Cd and its value is different for each fluid depending on the kind of measurement of flow. …

#### How do you calculate discharge from a venturimeter?

EXPERIMENTAL SETUP THE VENTURIMETER IS FITTED IN A PIPE LINE, TO WHICH AN INLET VALVE IS FITTED. THE PRESSURE TAPS ARE PROVIDED AT ENTRANCE SECTION 1 AND THROAT SECTION 2. A U-TUBE MERCURY MANOMETER IS FITTED BETWEEN THESE POINTS 1 AND 2. WATER TANK AND A STOP WATCH IS USED TO MEASURE THE DISCHARGE.

#### How is venturi meter flow calculated?

Venturi Flow Equation and Calculator

1. Preview: Venturi Flow Calculator.
2. and.
3. Therefore:
4. and.
5. Qmass = ρ · Q. Where: Q = volumetric flow rate (m3/s, in3/s) Qmass = Mass flowrate (kg/s, lbs/s) A1 = area = Π · r2 (mm2, in2) A2 = area = Π · r2 (mm2, in2) r1 = radius inlet at A1 (mm, in) r2 = radius inlet at A2 (mm, in)

What is the formula for fluid?

Fluid Power Formulas

 Variable Word Formula w/ Units Simplified Formula Fluid Pressure – P (PSI) = Force (Pounds) / Area ( Sq. In.) P = F / A Fluid Flow Rate – Q GPM= Flow (Gallons) / Unit Time (Minutes) Q = V / T Fluid Power in Horsepower – HP Horsepower = Pressure (PSIG) × Flow (GPM)/ 1714 HP = PQ / 1714 Actuator Formulas

## How is monthly discharge calculated?

The sum of daily flows for each month, when divided by the number of days in the month, will give the mean flow for that month. Then, sum each year’s monthly data for a particular month and divide by the number of years to obtain the mean monthly flow for that month for the period of record.

## What is the coefficient of discharge for a Venturimeter?

The discharge coefficient of a Venturi meter is typically 0.985, but may be even higher if the convergent section is machined.

Use the formula q=va to calculate the discharge of a river, where “q” is the discharge, “v” is the velocity and “a” is the cross-sectional area of the river. Loading Measure the depth and the width of the river. For example, assume a river is 4 metres deep and 5 metres wide in one area.

What is discharge equation?

Discharge Equation Simplest description of flow in a channel is that the volume rate of flow (discharge) is constant, assuming no tributaries are encountered Volume balance gives us the Discharge or Continuity Equation: (2) for measurement procedure, see Stream Gauging notes

### What is valve discharge coefficient?

Discharge Coefficient. The discharge coefficient is a characteristic non-dimensional factor of the valve, which is used to calculate the flow rate (Q) when the valve discharges the fluid from a tank or reservoir (Δh) to the environment.

### What is stream discharge equation?

Discharge, or the volume of water flowing in a stream over a set interval of time, can be determined with the equation: Q = AV, where Q is discharge (volume/unit time-e.g. m3/second, also called cumecs ), A is the cross-sectional area of the stream (e.g. m2), and V is the average velocity (e.g. m/s).

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