Eccentric Drain Port to Prevent Vortexing During Draining from Cylindrical Tanks

Sohn, Chang Hyun; Gowda, B. H. Lakshmana; Ju, M. G.

doi:10.2514/1.35651

Cited by 34 publications

(18 citation statements)

References 6 publications

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“…A circular flat plate with porous wall was used by Mahyari et al [6]. Sohn et al [7] studied the effect of eccentric drain holes in suppressing vortex.…”

Section: Introductionmentioning

confidence: 99%

The Critical Height of a Liquid Being Drained from the Tank with Bell-Mouth Drain Port

Mohammadi

Karimi

Islami

et al. 2012

Advances in Mechanical Engineering

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Vortexing occurs during draining of liquid from tanks. We studied the critical height of a liquid being drained from tank, that is, the liquid height at the moment when the air-core vortex reaches to the drain port. We firstly performed some experiments for determining the critical height, and then based upon the information obtained from the experiments; a simple analytical expression was derived to predict the critical height. The experimental results show that the vortex suppressor, which is suggested in the present paper, could effectively reduce the strength of vortex and consequently reduce the critical height. The results also show that the new analytical expression can predict the critical height with less than 20% error when vortex suppressor is used. To the best of our knowledge, draining from tanks with bell-mouth drain ports has not been paid attention to by other authors.

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“…A circular flat plate with porous wall was used by Mahyari et al [6]. Sohn et al [7] studied the effect of eccentric drain holes in suppressing vortex.…”

Section: Introductionmentioning

confidence: 99%

The Critical Height of a Liquid Being Drained from the Tank with Bell-Mouth Drain Port

Mohammadi

Karimi

Islami

et al. 2012

Advances in Mechanical Engineering

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“…In one of the past studies, the same author has shown that a device named dish-type suppressor could eliminate vortex formation (Gowda et al, 1996). Findings of Sohn et al (2008) reveal that drain ports positioned at eccentric locations could control vortex formation. AjithKumar et al (2016) have revealed that size of the drain outlet port has significant impact on the critical height of the vortex air core formation in a recent study and they suggested that there exists a critical value of drain hole size below which vortexing is annihilated.…”

Section: Introductionmentioning

confidence: 98%

“…As aforementioned, two of the earlier works executed out by Sohn et al (2008) and AjithKumar et al (2016) have reported two feasible strategies for the suppression of vortex air core formation by means of employing suitable drain port size and port eccentricity. But, when the drain port size is reduced below a critical value to suppress vortexing, the immediate consequence would be a diminution in the rate of discharge flow resulting in an increased draining time of the liquid.…”

Section: Introductionmentioning

confidence: 99%

“…But, when the drain port size is reduced below a critical value to suppress vortexing, the immediate consequence would be a diminution in the rate of discharge flow resulting in an increased draining time of the liquid. Quite interestingly, in the case of eccentric ports, port eccentricity itself act as a vortex suppressor (Sohn et al, 2008) and enables a bigger critical port size as revealed by AjithKumar et al (2017). However, it is thought that, when we employ a single eccentric drain port, eccentric location of the port is very likely to induce an overturning couple in space systems such as in liquid propellant tanks (Agarwal et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Rankine Vortex Formation during Draining: A New Twin Port Suppression Strategy

Prabhu

Kumar

Gopikrishnan

et al. 2020

JAFM

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This paper reveals the results of a study of vortex air core formation (Rankine vortex) when a rotated liquid (water) column in a cylindrical vessel is drained through two ports located at equal eccentricity (e) at the vessel base (diameter, 1 and 2) simultaneously; 1 is fixed whereas 2 is varied. Just before draining, a rotation (n rpm) is provided to the liquid column in controlled conditions. As draining progresses, when the liquid level reaches certain height called critical height (ℎ), initially a surface dip forms which further develops in to a vortex extending down till the drain port. Results show that critical height increases as the fluid rotation rate increases at the lowest eccentricity. But, at higher eccentricities, ℎ , exhibits more or less an increasingdecreasing trend in most of the cases studied. Critical height is observed to be minimum for the largest value of 2 (equal to 1) irrespective of the values of the speed of fluid rotation, liquid initial height and port eccentricity. To particularly note, at the highest eccentricity, vortex formation is found to be completely suppressed for all values of port diameter (2) and initial fluid rotation (n) as indicated by the near-zero critical height values. The tangential velocity measurements using Particle Image Velocimetry are also reported. PIV results obtained for certain cases with induced fluid rotation (normal draining and faster draining) correlate well with the changes in the efflux (axial) velocity (deduced analytically) in these cases studied. The tangential velocity along radial direction obtained (PIV) also indicated the type of vortex formed in normal and faster draining cases. Video visualization of vortex formation carried out reveals that, vortex air core switching takes place between the drain ports maintaining an arched or curvilinear surface profile apart from demonstrating the nature of outlet flow discharge. All the vortex air core formation studies so far carried out were invariably with single drain port except the preliminary novel study by the same author group and the present study is a detailed extension of that novel study.

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“…For preventing or suppressing the generation of the air core, the various attempts have been applied by the previous researchers [9][10][11][12]. However, we focused on the observing the physics inside the phenomenon rather than suggesting the new-type vortex suppressors be-cause the detailed understand for the phenomenon is more helpful to devise the high performance suppressor.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study on Air Core Phenomena at Liquid Draining From Cylindrical Tank

Park¹,

Sohn²

2014

Proceedings of 10th World Congress on Computational Mechanics

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An air core phenomenon observed from lavatory bowl draining in our daily lives has a very important scientific meaning because it is also observed from many industrial applications and related with a natural phenomenon such as tornado. Moreover since the air core affects the drain speed, it is deeply connected with a disaster such as flood from local heavy rain. Thus many studies preventing the air core from forming have been conducted and various types of vortex suppressor have been suggested. In this paper, the numerical simulation on air core phenomenon is introduced and a lot of simulating results such as cross-sectional flow field, air-core-formation time and so on are discussed in view of the reason of forming the air core. Simulations on various sized tanks and drain ports, and the initial rotating speed of cylinder wall have been conducted (total 56 cases). The container level heights firstly forming the air core were compared from each other case. From dimensional analyses, four non-dimensional parameters and the relating equation among them were determined.

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Eccentric Drain Port to Prevent Vortexing During Draining from Cylindrical Tanks

Cited by 34 publications

References 6 publications

The Critical Height of a Liquid Being Drained from the Tank with Bell-Mouth Drain Port

The Critical Height of a Liquid Being Drained from the Tank with Bell-Mouth Drain Port

Rankine Vortex Formation during Draining: A New Twin Port Suppression Strategy

Parametric Study on Air Core Phenomena at Liquid Draining From Cylindrical Tank

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