Vortex Suppression through Drain Port Sizing

Kumar, R. Ajith; Joykutty, Josy; Shaji, Rahul Korah; Srikrishnan, A R

doi:10.1061/(asce)as.1943-5525.0000609

Cited by 20 publications

(8 citation statements)

References 6 publications

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“…That means, the intensity of vortexing diminishes as 2 increases and this finding is quite contrary to SDP results. For the case of SDP, critical height is greater at larger drain port size (AjithKumar et al, 2016;AjithKumar et al, 2017) Critical submergence variation with respect to fluid rotation speed is nearly the same at all values of liquid initial heights as seen in Figs. 3(a) -3(c).…”

Section: Quantitative Analysissupporting

confidence: 53%

“…No systematic trend is observed for the variation of time of draining with 2 . Paradoxically, as port size increases, dimensionless emptying time also becomes larger for a SDP irrespective of its location (concentric/eccentric) because critical submergence increases (AjithKumar et al, 2016;AjithKumar et al, 2017). At higher critical heights, vortex air core forms early and blocks the drain port reducing the discharge flow rate.…”

Section: Quantitative Analysismentioning

confidence: 99%

“…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%

“…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. Quite interestingly, AjithKumar et al (2017) also found that, at higher eccentricities, higher would be the critical port diameter for vortex suppression.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Quantitative Analysissupporting

confidence: 53%

Section: Quantitative Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Prabhu

Kumar

Gopikrishnan

et al. 2020

JAFM

Self Cite

View full text Add to dashboard Cite

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“…Computational studies carried out by Sohn et al 3 found that air core vortexing can be influenced by altering the values of port and tank diameters. Experimental investigations by Ajith Kumar et al 6 suggested that, air core vortexing can be suppressed by providing an eccentricity to the drain ports located at tank base. Further studies by Ajith Kumar et al 7 revealed that, the ratio of port diameter to tank diameter required to suppress air core vortex is the lowest for concentric drain ports and it increases with port eccentricity (measured from tank center).…”

Section: Introductionmentioning

confidence: 99%

Air core vortexing in liquid draining tanks: Influence of surface roughness

Prabhu

Nair²,

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper study the influence of roughness of the tank base in the formation of air core vortex when liquid inside the cylindrical tank is rotated and subsequently drained. The vortex air core formation in drain tanks can lead to the blockage of drain port and can result in reduced discharge of draining liquid as an immediate consequence. The formation of such a vortex in propellant tanks of spacecraft and rockets will lead to underutilization of propellants and can adversely affect the performance of rocket engines. Ingestion of air core vortex in metal casting process can affect the mechanical properties of casted metal. Hence, suppression of air core vortex is inevitable in the fields of aerospace, metal casting and other hydraulic engineering systems. Current study makes use of roughness of the tank base to suppress vortexing which is the first of its kind and therefore, novel. Experimental investigations have been carried out at several values of roughness height and initial fluid rotation to study the characteristics of air core vortex. It is found that at the highest value of initial rotation provided to the liquid, air core vortexing can be subdued up to 25% by making use of base roughness. Current study also recommends drain tank manufacturers not to smoothen the tank base surface spending time at extra cost. In addition, applying roughness on the tank base will further weaken the formation of air core vortex, in the light of this study.

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Suppression and Control of Vortex Formation Caused by Boundary Disturbance during Ladle Teeming Process

Wang,

Li,

Sun

et al. 2024

steel research int.

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During the final stage of ladle teeming, vortex formation leads to air entrainment and slag entrapment, resulting in steel degradation. To effectively control this formation during ladle pouring, reverse rotation is introduced in the vortex to generate boundary disturbances. Further, water modeling is performed to investigate the influences of container diameter, nozzle diameter, initial disturbance, and reverse rotation on vortex formation. While larger‐diameter containers facilitate easier vortex formation, smaller‐diameter nozzles trigger faster vortex formation. Vortex penetration height and maintenance time increase with increasing initial tangential velocity. In addition, boundary disturbances resulting from reverse rotation effectively suppress vortex formation. Overall, to eliminate vortices, the applied disturbances must counteract the gradually accumulating angular momentum of the vortices.

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Vortex Suppression through Drain Port Sizing

Cited by 20 publications

References 6 publications

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

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

Air core vortexing in liquid draining tanks: Influence of surface roughness

Suppression and Control of Vortex Formation Caused by Boundary Disturbance during Ladle Teeming Process

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