MODERN FLUID FLOW MEASURING INSTRUMENT Prepared by: Koladiya Milan R (130920105014) Koladia Alpesh (130920105015) Kukadia Chirag (130920105016) Mandavwala Harsh (130920105017) Veerayatan Droup of Institutions, FOE & FOM, Mandvi

Hot wire anemometer Laser Doppler anemometer Particle image velocimetry

1 Hot wire anemometer Classification Single sensor probe Dual sensor probe Triple sensor probe

Advantages: Good frequency response Wide velocity range Output is continuous Limitations: Probe blockage Used for only clean gas Needs to be recalibrated frequently

2. Laser Doppler anemometer Measures velocity using laser light The objects may be microscopic particle in a fluid, solid surface Velocity of object is obtained by measuring the change in wavelength of the reflected light

Advantages and limitations: Non contact flow measurement technique Direct way of measuring local velocity Very high frequency response Ideal for real time flow measurement

3. Particle image velocimetry Non intrusive full field optical measuring technique for fluid motion velocity The fluid of interest is seeded with tracer particle illuminated by a sheet of bright light The positions of these particles at different times are recorded on a camera Then, by measuring the particle displacement, the motion of fluid can be measured

Applications: Aerodynamics Hydrodynamics Internal combustion engines Reactive flow Mixing flow Spray formation

Advantages and limitations Non intrusive Negligible distortion of the fluid flow Avoids the need for intrusive flow measurement probe Capable of measuring an entire two dimensional cross section