Turbulence in two-phase bubbly flow

Michiyoshi, Itaru; Serizawa, Akimi

doi:10.1016/0029-5493(86)90052-x

Cited by 105 publications

(42 citation statements)

References 10 publications

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“…The findings of the present study are also in agreement with studies done by Thang and Davis [2], Van der Welle [3], Michiyoshi and Serizawa [4], Winterton and Orby [5] and Winterton and Munaweera [6] who assumed a spherical shape for bubbles flowing in vertical pipe bubbly flow. Similarly, numerical studies done by Lu and Tryggvason [17] reported quasi spherical bubbles with diameters of 1.53 m m and slightly ellipsoidal bubbles with diameters of 1.84 m m through the application of direct numerical simulations for bubbly air water two-phase downward flow.…”

Section: Resultssupporting

confidence: 93%

“…The studies done by Thang and Davis [2], Van der Welle [3], Michiyoshi and Serizawa [4], Winterton and Orby [5] and Winterton and Munaweera [6] in vertical two-phase bubbly flow, have assumed a perfectly spherical bubble shape. However, Liu [7] reported that bubble elongation along the flow is observed with the presence of larger bubbles, with minimal elongation observed with smaller sized bubbles.…”

Section: Introductionmentioning

confidence: 99%

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Bubble shape and breakage events in a vertical pipe at the boiler flow line

Fsadni

2014

EPJ Web of Conferences

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Abstract. The theoretical and experimental aspects concerning the typical bubble shape at the flow line of a standard domestic central heating system are investigated. This is done in support of the on-going research on two-phase flows in domestic central heating systems. Bubble nucleation and detachment at the primary heat exchanger wall of a domestic central heating boiler results in a bubbly two-phase flow in the system pipe work. Bubbly flow results in undesired cold spots at higher points in the system, consequently diminishing system performance. An experimental analysis was done on the bubble shape at the exit of the boiler through the application of photographic techniques. The results are presented in terms of the measured bubble aspect ratios at some principal system operating conditions. The dimensionless Eotvos and bubble Reynolds number were calculated and tabulated with the measured mean diameters. The data was subsequently correlated to the bubble shape regime diagram. Results suggest that most bubbles are quasi-spherical in shape with a noticeable elongation at lower bulk fluid Reynolds numbers.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Bubble shape and breakage events in a vertical pipe at the boiler flow line

Fsadni

2014

EPJ Web of Conferences

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“…Serizawa [30] explained that this peaking in the wall region would reflect agitating bubble motions due to bubble-wall interactions and also the interactions between bubbles and large scale liquid eddies.…”

Section: Resultsmentioning

confidence: 99%

Local flow measurements of vertical upward bubbly flow in an annulus

Hibiki

Situ

et al. 2003

International Journal of Heat and Mass Transfer

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“…Serizawa et al [21], Michiyoshi and Serizawa [22], Revankar and Ishii [18], Liu and Bankoff [23] and Hibiki et al [24] reported that in contrast to the downward flow void fraction distribution, two-phase upward flow is expected to result in a peak void fraction close to the wall. Kashinsky and Randin [5] attributed this to the transverse lift force, as originally defined by Žun [20], acting on the bubble in an 01030-p. 5 upward flow (with an opposite sign to that for a downward flow), thus leading to wall peaked void fraction distribution profiles across the pipe section.…”

Section: Resultsmentioning

confidence: 99%

Two-phase distribution in the vertical flow line of a domestic wet central heating system

Fsadni

2013

EPJ Web of Conferences

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Abstract. The theoretical and experimental aspects of bubble distribution in bubbly two-phase flow are reviewed in the context of the micro bubbles present in a domestic gas fired wet central heating system. The latter systems are mostly operated through the circulation of heated standard tap water through a closed loop circuit which often results in water supersaturated with dissolved air. This leads to micro bubble nucleation at the primary heat exchanger wall, followed by detachment along the flow. Consequently, a bubbly two-phase flow characterises the flow line of such systems. The two-phase distribution across the vertical and horizontal pipes was measured through a consideration of the volumetric void fraction, quantified through photographic techniques. The bubble distribution in the vertical pipe in down flow conditions was measured to be quasi homogenous across the pipe section with a negligible reduction in t he void fraction at close proximity to the pipe wall. Such a reduction was more evident at lower bulk fluid velocities.

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Turbulence in two-phase bubbly flow

Cited by 105 publications

References 10 publications

Bubble shape and breakage events in a vertical pipe at the boiler flow line

Bubble shape and breakage events in a vertical pipe at the boiler flow line

Local flow measurements of vertical upward bubbly flow in an annulus

Two-phase distribution in the vertical flow line of a domestic wet central heating system

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