Vortexing during draining through twin drain ports in a cylindrical tank

Gopikrishnan, T. H.; U, Anandakrishnan; Kiran, A. S.; Kumar, R. Ajith; Anith, T. A.

doi:10.1109/i2ct.2017.8226145

Cited by 2 publications

(2 citation statements)

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“…As already mentioned, all the previous investigations were carried out with only one drain port except the preliminary novel study conducted by the same author group on twin port draining (Gopikrishnan et al, 2017). In the present study, the preliminary study conducted earlier is extended to detail much more features of the vortexing phenomenon and are reported in this paper.…”

Section: Introductionmentioning

confidence: 77%

“…Quite interestingly, AjithKumar et al (2017) also found that, at higher eccentricities, higher would be the critical port diameter for vortex suppression. To specifically mention, all these previous investigations were on the application of a single drain port except the preliminary study by the same author group (Gopikrishnan et al, 2017).…”

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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Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%