Visualisation of air–water bubbly column flow using array Ultrasonic Velocity Profiler

CFD Simulation of Bubbly Flow Through a Bubble Column

In this investigation, CFD simulation is presented to study the hydrodynamic of bubbly flow and mass transfer in bubble column using EulerianEulerian Multifluid approach with a standard kε turbulence model. unsteady state method for modeling the multiphase flow and mass transfer from air to de-aerated water and the column hydrodynamics. Understanding the complexity of the fluid dynamics and mas...

Measurement of Reynolds Stress in Bubbly Flow Using Ultrasonic Doppler Method

Microscopic structure in bubbly flows is a topic of interest in the study of fluid flows. In the present paper, the Ultrasonic Doppler Method was applied to the measurement of bubbly flows from which Reynolds stress profiles were obtained. Experiments were carried out for an air-water dispersed bubbly flow in a 20mm x 100 mm vertical rectangular channel having a void fraction smaller than 3%. T...

Turbulent Bubbly Flow

Sensitive Measurement of Flow Velocity and Flow Direction Using a Circular Thermistor Array

Eight highly sensitive amorphous germanium thermistors (TCR = -1.8%/K) are the sensitive part of the micromachined sensors for flow velocity and flow direction. Carried by a 1.3 μm thick diaphragm they measure temperature differences generated by the sample flow and a heater (430 μW). This allows gas flow measurements in the range from 0.025 m/s to about 3 m/s with a sensitivity of up to 30 mV/...

Visualisation of Ultrasonic Testing Data Using Augmented Reality

Ultrasonic testing data is usually visualised in form of Cand D-images. For simple inspection tasks of flat samples, these representation methods are an effective means for identifying and evaluating defects. However, for complex inspection tasks, e.g. testing of large curved composite structures, it is often difficult to relate the findings to the tested structure. Therefore it is important to...