Draining of liquid from tanks of square or rectangular cross sections

Gowda, B. H. Lakshmana

doi:10.2514/3.26760

Cited by 26 publications

(15 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The drain port with a diameter of 6 mm was axially located. With the drain port closed by a stopper, rotation was imparted to the liquid (water) in the container by controlled stirring using varying numbers of revolution of the stirrer over a constant period [6]. The stirrer, with a diameter of 18 mm, was a hollow tube with a wall thickness of 0.5 mm and length of 500 mm.…”

Section: Methodsmentioning

confidence: 99%

“…Gowda et al [12] and Gowda and Udhayakumar [13] used a dish-type and vane-type suppressor to prevent vortex formation. Gowda [6] showed that vortexing is suppressed in a square container with sharp corners, even with rotation and draining. However, vortexing occurs in a container with circular cross-section with rotation imparting and draining.…”

Section: Introductionmentioning

confidence: 99%

“…An analytical study of this problem was investigated by Forbes and Hocking [5]. Initial disturbances such as rotational motion and vibration due to environmental disturbances can augment the vortex formation [6]. This phenomenon has practical relevance in fuel feed systems in space vehicles and rockets.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

PIV study of vortexing during draining from square tanks

Sohn

Gowda

2010

J Mech Sci Technol

View full text Add to dashboard Cite

The flow field in square tanks with various corner roundings is studied to investigate drain flow characteristics. An attempt is made to understand the mechanism of flow field responsible for vortex suppression by the different radius of rounding at the corner. For this purpose, flow visualization studies using particle image velocimetry are employed to determine the flow patterns in a square tank. Results are obtained for no draining and with draining experiments. The flow field is visualized both in horizontal and vertical planes. The results reveal that the secondary vortices formed at the corners are responsible for vortex suppression.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

PIV study of vortexing during draining from square tanks

Sohn

Gowda

2010

J Mech Sci Technol

View full text Add to dashboard Cite

show abstract

“…As Gowda (1996) reports, vessels with rectangular cross-section (including square) prevent vortexing phenomenon. He argued that the presence of four sharp corners in the square and the rectangular shapes coupled with the non-axisymmetry of the sections prevent the development of rotational motion.…”

Section: Introductionmentioning

confidence: 86%

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

Prabhu

Kumar

Gopikrishnan

et al. 2020

JAFM

View full text Add to dashboard Cite

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.

show abstract

“…In some cases the free surface is located too close to the outlet, as is done in a power plant's intake [1,2]. A simple device was suggested for preventing vortex formation in a small scale cylindrical container by L. Gowda et al [3,4]. The effects of the initial tangential velocity and the intake eccentricity on the critical height were examined by Piva et al [5].…”

Section: Introductionmentioning

confidence: 98%

Numerical and experimental investigation of vortex breaker effectiveness on the improvement in launch vehicle ballistic parameters

et al. 2010

View full text Add to dashboard Cite

The focus of the present study is to investigate the effectiveness of installing vortex breakers at the outlet of launch vehicle tanks on postponing vortex formation and decreasing the critical height of propellants while discharging. Analytical results in the absence of a vortex breaker show that the effects of the Weber and Reynolds numbers in the flow field can be ignored for values greater than 720 and 1.1 × 10 5 , respectively; and critical height can be considered as a function of Froude number under aforementioned conditions. The analytical criteria are verified by two-dimensional, axis symmetrical, transient and two-phase numerical model. Eventually, some experiments are conducted to examine the effectiveness of the applied vortex breakers in reduction of the critical height of propellant. Experimental results show that a 30% decrease can be achieved in critical height by using a particular type of vortex breaker. Additionally, the carried out simulations for an existing two-stage launch vehicle indicate a 13% increase in orbital altitude, which in turn proves the considerable improvement in launch vehicle mass/energetic capabilities.

show abstract

Draining of liquid from tanks of square or rectangular cross sections

Cited by 26 publications

References 3 publications

PIV study of vortexing during draining from square tanks

PIV study of vortexing during draining from square tanks

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

Numerical and experimental investigation of vortex breaker effectiveness on the improvement in launch vehicle ballistic parameters

Contact Info

Product

Resources

About