Indeed, for a partially or a non-wetting behaviour, there are discrepancies between the measured bubble lengths and those predicted by Garstecki et al.'s model given for a completely wetting liquid/liquid or gas/liquid system.
Although the use of the one-dimensional approach is not accurate, especially close to the bubble cap, it is considered as a valid approximation and it yields reasonable results for the modeling of pressure drop, bubble length and void fraction in slug flow.
Statistical bubble parameters (bubble frequency, mean bubble rise velocity, mean pierced bubble length and mean bubble volume fraction) were evaluated.
Additionally, the BMMR is compared to that of a single channel regard the slug and bubble lengths and bubble generation frequency.
Criteria for determining flow regime transitions, developed in air-water two-phase flow based on bubble frequency, Sauter mean bubble chord length and the time taken by a bubble to pass a given point, were successfully applied to gas-liquid-solid three-phase fluidized beds.
Special emphasis has been given to the analysis of the separation and reattachment points, the recirculation bubble length, the vortex shedding mechanisms and the wake structures.
Capacitance probe analysis was used to determine the mean bubble rise velocity, the mean bubble frequency, the mean pierced bubble length, the mean bubble volume fraction and the mean visible bubble flow rate.
The evolution of the liquid slug and elongated bubble length distributions along the pipes is characterized by a gradual growth of the mean and mode values.
In the present work, the behavior of the elongated bubbles in two-phase plug flow at a microscale branching T-junction was studied both experimentally and numerically, and the effect of the bubble length on the split ratio of the gas flow to the branch was tested.
It was found that the particle deformation increased with the droplet (bubble) length or the capillary number.
