chee291lab3

chee291lab3 - Instrumental Measurement Laboratory Chee 291...

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Instrumental Measurement Laboratory Chee 291 Flow Measurements Laboratory TA. Stacey Meadley Date : November 8th,2007 Group 14+17 Name : Loren Olshansky Darren Narren Raky Ly Nayyara Mangee

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2 Nomenclatures Constants Meriam Blue SP.G = 1.75 Mercury SP.G = 13.6 Meriam Red SP.G = 2.95 g c = 1.0kg.m/N.s 2 dynamic viscosity of water (µ)= 0.001kg/m.s ρ(water)= 1000kg/m 3 ρ(air)= 1.2kg/m 3 g = 9.81m/s 2 isotropic exponent k=1.4 R= 287.1 J/(kgK) = 287.1 m 2 /(s 2 K) T°=25°C=298K P°= 101.325kPa The outlet diameter of the Venturi meter is 10cm The inlet diameter of the Venturi meter is 22mm Equations Area= (л/4)*(D) 2 SG = (ρ medium )/( ρ water ) ΔP = ρgΔh mass flow rate= density(water)* volumetric flow rate Q ideal= [A 2 /(1-(A 2 /A 1 ) 2 ) 1/2 ]*[(2g c (P 1 -P 2 ))/ρ water ] 1/2 Flow coefficient Q = F/K Free stream velocity = ((2ΔP)/(ρ water )) 1/2 Discharge coefficient C = Q actual/ Q ideal Re d = (ρU m d)/µ Where mean velocity U m = Q ideal/ A V 2 = 2RT° (ΔP/P°)*(1+ (1/2k)*(ΔP/P°)) Continuity equation: m in = m out and Q 1 = Q 2 for incompressible flows
3 Table of Contents 1. Introduction 4 2. Background 9-10 3. Experimental Condition 10 4. Section A 2.1. Tables and Graph 11-15 2.2. Sample Calculation 16 2.3. Discussion . 17 -18 5. Section B 2.1. Tables and Graph 18-20 2.2. Sample Calculation 21 2.3. Discussion . 22 6. Conclusion 23 7. References 24

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4 Introduction In the lab we study and measure both liquid and gas flow. In section A o the lab the objective was to calibrate and demonstrate the operation of four flow meters using a water flow loop the rotameter, pitot tube, turbine flowmeter and, the orifice plate meter. The flow was measured directly using position displacement as well as indirectly through the pressure drops of different devices. The flow rate was adjusted using the rotameter. From there, the measurements were taken from the flow meters . From all of the data was used to plot graphs such as the mass flow rate versus the measured output of the meters. In the Section B of the lab the objectives was to to study the principles of the Venturi flowmeter, hot wire anemometer and vane anemometer, compare the readings obtained with the instruments, and study the gas velocity profile in the tube. The flow of air was adjusted by transformer scale at five different reading the data was recorded. This data was analyzed by plotting graphs.
5 Background A Rotameter is a device that measures the flow rate of liquid or gas in a closed tube. The flow enters the bottom of the tapered vertical tube and causes the bob or float to move upward. The bob will rises to a point in the tube such that the drag forces are just balanced by the weight and buoyancy forces. The height of the bob in the tube is directly proportional to the flow rate and to the annular area between the float and the tube wall; this is the reason why the device is also called an area meter. The greater the flow, the higher the float is raised. With liquids, the

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chee291lab3 - Instrumental Measurement Laboratory Chee 291...

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