Flow Measuring Apparatus

Topics: Fluid dynamics, Orifice plate, Mass flow rate Pages: 6 (1532 words) Published: November 27, 2010
The flow measuring apparatus is designed to study which the most preferable flow meter from different typical methods of measuring the discharge of an incompressible fluid. This can be identify by measuring the flow rate and the head loss with later to be compared to the different flow meter which is venture meter, orifice meter and rotameter. INTRODUCTION

The objectives of this experiment are to demonstrate the characteristics of some various commonly used methods of measuring fluid flow rates and to identify the head losses associated with each flow measuring apparatus. The devices to measure the flow rate are determined by using a venturi meter, an orifice plate meter and a rotameter. Head losses associated with each meter are determined and calculated. This experiment is related to the applications of the Steady Flow Energy Equation (Bernoulli’s Equation). It can be written in the form; p1ρg + 122g + z1 = p2ρg + 2 2g + z2 + ∆H12 (1) Where pρg is termed the hydrostatic head.

22g is termed the kinetic head (is the mean ratio of velocity i.e. the ratio of volumetric discharge to cross-sectional area of tube) z is termed potential head

p/ρg + 2/2g + z represents the total head.

1. Flow measuring apparatus (model H1D)
2. Volumetric hydraulic bench/water
3. Digital stopwatch

I rotameter wide angle diffuser manometer tappings D E F G Venturi meter Hflow A C B 20mm 26mm 26mm 16mm 51mm Orifice meter|

Figure 1: Explanatory diagram of flow measuring apparatus

The maximum value of rotameter reading is determined so that all the manometers readings from A to I can be recorded. . As the water been discharged, the stopwatch is started in the same time. The readings in the manometers been taken during the water discharging in the tank.

1. Firstly the pump in the hydraulic bench is turn on and the valve on the bench is slowly opened until the water is started to flow. 2. The opening of the valve is continued until the rotameter reach its maximum reading. 3. During this period, the reading of the manometers from A to I are recorded. 4. As the discharge of water is weighed in the weighing tank, the stopwatch is started when the water level showed zero reading. 5. The stopwatch is stopped when the water level reached a certain reading in order to get the mass flow rate. 6. Steps 3 to 5 are repeated for seven set of readings with equidistant values of rotameter readings which taken twice for every reading. 7. Mass flow rate and head loss is determined from the value taken. 8. The data obtained is recorded in a table.

9. The rotameter calibration curve is plotted to identify the head loss for rotameter


Manometer levels (mm)| Rotameter (cm)| Water mass, m (kg)| Time, t (s)| Test no...
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