No abstract

The momentum integral technique is used to describe the steady-state, laminar, accelerating flow of a power-law liquid film along a vertical wall. Values for film thicknesses and boundary-layer thicknesses are obtained numerically and compared with existing analytical solutions for Newtonian fluids.

In order to realise visualisation measurement of gas-solid two-phase flow parameters, a gas-solid two-phase flow test-bed was developed. Polypropylene particles select as the solid phase, the air select as the gas phase. Solid phase rely on their own gravity flow through experimental device. M3C capacitance tomography device of ITS Company is used for test and research solid phase concentration, speed, mass flow rate about gas-solid two-phase flow parameters. Concentration measurement is based on the dielectric constant distribution of the pixels about image. Capacitive sensor was used to measure velocity with double layer structure. The relevant principles of measurement speed were used to compute the correlation of downstream sensor imaging pixel. Finally, his mass flow was calculated by the measured velocity and concentration distributions. The mass flow measurements were compared with the results of gravity sensor, and the results showed good agreement, measurement error was less than 10%. The experimental results show that the capacitance tomography system can be used to measure gas-solid two-phase flow parameters. H. Tian et al.

Experiments were conducted to study characteristics of flow when flow is fluctuating. The experimental results showed a phase difference between the flow rate and the pressure drop fluctuations. This phase difference between the fluctuating flow rate and pressure drop was analyzed for laminar flow. Analysis showed that the phase difference changes with the period of the flow fluctuation, the pipe radius, the density and the dynamic viscosity of the liquid. Fluctuating pipe flow was then numerically simulated. Results of the numerical simulation were compared with theoretical values and experimental results. It was shown that, when the flow rate fluctuates with time as a sine wave, the pressure drop fluctuates with the same periodicity, and there is a phase difference between them.