Bubble flow regime

Moderate viscosity (> 100 cP) will tend to keep the flow regime bubbly at higher superficial velocities. Bubbly flow at high superficial velocity approximates to homogeneous flow. At very high viscosity, completely different flow regimes may occur (see 10.2.3). 

Flow regime Bubbling, slugging or turbulent, distinct upper interface Fast fluidization Dilute transport... 

Liu, H., Vandu, C. O., Krishna, R. (2005). Hydrodynamics of Taylm flow in vertical capillaries flow regimes, bubble rise velocity, liquid slug length, and pressure drop. Industrial and Engineering Chemistry Research, 44, 4884-4897. 

Flow regime (change of flow regime bubbly - chu rn-turbu-1 ent<- si ugs) Little effect, not very pronounced with respect to R a Drastic effects... 

Flow Regimes in Multiphase Reactors. Reactant contacting, product separations, rates of mass and heat transport, and ultimately reaction conversion and product yields are strong functions of the gas and Hquid flow patterns within the reactors. The nomenclature of commonly observed flow patterns or flow regimes reflects observed flow characteristics, ie, armular, bubbly, plug, slug, spray, stratified, and wavy. 

Discharge Flow Regimes Upon developing a puncture in either the vessel or a line attached to the vessel, as in Fig. 26-62, the subsequent depressurization can cause a volatile liqmd to flash and develop bubbles in the liquid. These bubbles cause an expansion, or. 9well, which raises the two-phase, or frothy, level. If the puncture is in the vapor space of a vessel or on a line from the vapor space, the discharge will be at least initially all vapor. This is the simplest discharge case and is treated here as a special case. 

Figure 26. Flow regime map for horizontal gas and liquid flows (D - droplet X - stratification M - mixed B - bubble).

A plot of (dP/dL)p/(dP/dL)sL versus (1-Rc) results in three distinct lines shown in Figure 27, where the values of the constants a and b are indicated. The three ranges correspond to approximately the bubble-slug, stratified, and annular flow regimes. Formulas to calculate for substitution into the above equation are ... 

An extensive treaunent of gas-liquid flows encountered in industry applications, along with numerous design correlations can be found in Volume 3 of the Encyclopedia of Fluid Mechanics - Gas-Liquid Flows (N. P. Cheremisinoff, editor. Gulf Publishing Co, Houston, TX, 1986). Further discussions in this volume can be found in Chapter 4 with regard to flow regimes typically encountered in bubble columns and similar devices. 

Methods are given for the bubbly and chiirn-tnrbnlent flow regimes within the vessel. 

The flow regime maps shown in Fig. 5.16a,b indicate that typical flow patterns encountered in the conventional, large-sized vertical circular tubes, such as bubbly flow, slug flow, churn flow and annular flow, were also observed in the channels having larger hydraulic diameters ([Pg.216]

Figure 5.16c indicates that as the channel size was reduced to Jh = 0.866 mm, the dispersed bubbly flow pattern vanished from the flow regime map. Figure 5.16a-c indicates that the slug-churn flow transition line shifted to the right, as the channel size was reduced. Similar trends were also found in small circular tubes by the... 

Damianides and Westwater (1988) used a 1 mm inner diameter, circular horizontal channel, and identified flve flow regimes, i.e., bubbly, plug, slug, pseudo-slug. 

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