Two phase flow characterization using a laser-photo resistor arrangement

The sensing techniques for void fraction measurement during two phase flows in conventional/ mini/micro channels can be a combination of radioactive (gamma ray densitometer), electrical (impedance, capacitance, conductance), electromagnetic (Infrared, microwaves), acoustic (ultrasonic) or optical (laser) based sensors. While the initial developments of such sensors were intrusive in the past, the recent works report non-intrusive measurements for non-metallic tubes. Among the above mentioned non-intrusive techniques laser based measurements such as Laser induced fluorescence (LIF), Planar LIF with dye Inhibition are more precise because of the optical behavior of LASER. The classical devices such as PIV, ADV, LDV are precise but cannot be used when the local void fraction exceeds 5%. The applicability of such systems on mini/micro channels brings further complexities