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Name: EGME 306B Fluids & Thermal Laboratory June 8, 2016 Experiment 1 Flow through a Venturi meter Introduction A Venturi meter is a is a flow measurement instrument that is used to calculate and measure flow rates, Reynold’s number and fluid velocities inside pipes and channels. It contains a converging section (inlet), throat and a diverging section (outlet) of a pipe to give a peek and a rise in the flow velocity and a corresponding pressure drop from which the flow rate can be measured. The rise of velocity causes a drop in pressure according to Bernoulli equation. The difference between high pressure and low pressure in a pipe is a useful technique of the Venture meter to measure the flow rate. Theory Procedure Step 1: After the system is ready to operate, adjust the supply and control valves so that the piezometers indicate the following differences in heights between the inlet (hA) and the throat (hD): Run 01: (hA − hD) = 10 inches of water (in H2O), high flow-rate Run 02: (hA − hD) = 8 in H2O Run 03: (hA − hD) = 6 in H2O Run 04: (hA − hD) = 4 in H2O Run 05: (hA − hD) = 2 in H2O Run 06: (hA − hD) = 0.6 in H2O, low flow-rate Step 2: For each run, record the height of the water in each piezometer tube. Step 3: For each run, after the pressure distribution is recorded, measure the flow-rate by collecting the water in the weighing tank and recording the collection time. Step 3.1: Place a 15 lbf weight on the right side of the lever of the scale. Step 3.2: Close the gate of the water tank. Step 3.3: When the lever becomes level, start the timer and put another 15 lbf weight on the lever. Step 3.4: When the lever becomes level again, record the time and put another 15 lbf weight on. Step 3.5: Repeat the measurement five more times and record your measurements. Step 4: Use a digital thermometer to record water temperature and use this value to find the corresponding water density and viscosity conclusion & Discussion The equation of energy is obtained by the first law of thermodynamic, while the Bernoulli equation is derived by Newton's second law under certain assumptions, for our scenario, the energy equation reduced to be Bernoulli equation under incompressible, steady and in viscid assumptions. The high value of fraction resistance and the low pressure at the throat could be two reasons why the pressure recovery is not 100%, which was neglected in this experiment calculation. The discharge coefficient ranges from 0.91 to 0.97, which is the ratio between the theoretical and experimental flow rate. However, there are some errors associated with this experiment such as time accuracy for mass-flow rate, and uncertainty related to the manometer scale. It is only required to have two pressure taps consisting of small holes on the surface, in order to measure flow-using Venturi. First is one should be located at the inlet, and another one is located at the throat the minimum cross sectional area of the Venturi. The orifice meter, the nozzle meter, and the Venturi meter are most common flow meter devices using Bernoulli equation. The shape of the Venturi affects the range of 𝐶𝑑 _values, and most of the head loss occurs due to the friction of the walls. As a result, the flow could be separated, and could cause inefficient of motion.
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Running Header: Flow through a venturi meter.

Name:
EGME 306B
Fluids & Thermal Laboratory
June 8, 2016
Experiment 1
Flow through a Venturi meter

Introduction.

2
Running Header: Flow through a venturi meter.
A venturi meter is an instrument used to measure flow in fluids. This type of a flow meter used
to calculate flow rates, Reynolds number and fluid velocities inside pipes or channels. It is
composed of a converging section known as an inlet, a throat and a diverging section which is
the outlet. This set up gives an increase of the flow velocity and as a result pressure decreases
enabling the flow to be measured. The ...


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