Flow regime identification in microgravity two-phase flows using void fraction signals

Lowe, Devin C.; Rezkallah, K.S.

doi:10.1016/s0301-9322(98)00058-5

Cited by 86 publications

(45 citation statements)

References 11 publications

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“…1995; Rezkallah, 1996;Lowe and Rezkallah, 1999) may overestimate the gas super®cial velocity at the boundary between annular and slug±annular transitional¯ows. The widely used drift-¯ux model cannot predict well the bubble-to-intermittent transition observed in the present experiment; neither can the model proposed by Wolk et al (1999).…”

Section: Resultsmentioning

confidence: 99%

“…There is also an empirical Weber number model developed by Rezkallah and his colleagues (Zhao and Rezkallah, 1993;Rezkallah and Zhao, 1995;Rezkallah, 1996;Lowe and Rezkallah, 1999), in which the slug±annular transitional¯ow is regarded as a basic regime. It is, however, pointed out by that the regime of slug±annular transitional¯ow predicted by this model is often too wide to contain some annular, slug and bubble¯ow data.…”

Section: Intermittent-to-annular Transitionmentioning

confidence: 99%

“…It is, however, pointed out by that the regime of slug±annular transitional¯ow predicted by this model is often too wide to contain some annular, slug and bubble¯ow data. Its latest transitional lines, proposed by Lowe and Rezkallah (1999), are also plotted in Fig. 5.…”

Section: Intermittent-to-annular Transitionmentioning

confidence: 99%

“…In the past one and a half decades, some experimental investigations of the two-phase¯ows have been conducted in the reduced gravity conditions aboard an aircraft¯ying parabolic trajectories (Dukler et al, 1988;Colin et al, 1991;Rezkallah, 1993, 1995;Bousman et al, 1996;Lowe and Rezkallah, 1999;. However, there exist some drawbacks to this method.…”

Section: Introductionmentioning

confidence: 99%

“…The disadvantage, however, is that they are not complete simulations of microgravity two-phase gas±liquid ows. E orts have also been made to develop the criteria of the¯ow pattern transitions at reduced gravity (Lee, 1987(Lee, , 1993Dukler et al, 1988;Colin et al, 1991Colin et al, , 1996Zhao and Rezkallah, 1993;Best, 1994, 1996;Rezkallah and Zhao, 1995;Reinarts, 1995;Bousman et al, 1996;Rezkallah, 1996;Jayawardena et al, 1997;Lowe and Rezkallah, 1999;.…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies on two-phase flow patterns aboard the Mir space station

Zhao

Xie

Lin

et al. 2001

International Journal of Multiphase Flow

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A series of experiments on two-phase gas±liquid¯ow patterns in a test tube with a length of 356 mm and an inside diameter of 10 mm were performed aboard the Mir Space Station in August 1999. Carbogal and air were used as the liquid and the gas phase, respectively. In the present paper, the experimental results at the background microgravity environment of the Mir Space Station (no more than 10 À5 g) were reported. Five kinds of¯ow patterns, namely dispersed bubble¯ow, bubble¯ow, slug¯ow, slug±annular transitional ow, and annular¯ow, were observed in the space experiment. Due to the small length-to-diameter ratio of the test tube used in the present study, the observed¯ow patterns should be considered to be developing ones. The experimental results were compared with the model proposed previously which accounts for the entrance e ects on the¯ow pattern transitions. A good agreement between the predictions and the experimental data was obtained. Some widely used models developed based on the analysis of fully developed two-phase¯ow at microgravity were also compared with the present data in order to make evaluations of these models and to have some insights on the¯ow evolution. Ó

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Section: Resultsmentioning

confidence: 99%

Section: Intermittent-to-annular Transitionmentioning

confidence: 99%

Section: Intermittent-to-annular Transitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental studies on two-phase flow patterns aboard the Mir space station

Zhao

Xie

Lin

et al. 2001

International Journal of Multiphase Flow

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Analysis on chaotic nature of a pressurized spout‐fluid bed by information theory based Shannon entropy

Wang

et al. 2009

Can J Chem Eng

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Pressure fluctuation measurements were conducted in a pressurized spout-fluid bed of 100 mm in diameter with bed pressure up to 0.4 MPa. Information theory based Shannon entropy analysis of pressure fluctuation was developed to recognize chaotic nature of gas-solid flows. It was found that both Shannon entropy and Shannon entropy increment rate were pronounced with the flow patterns and transitions. Moreover, Shannon entropy increment rate could describe the change of chaotic nature with operating conditions. Increasing chaotic nature was observed with increasing fluidizing gas flow rate. When elevating bed pressure, stable flow regions became large and the chaotic nature was weakened.

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