Impinging plane fountains in a homogeneous fluid

Srinarayana, N.; Armfield, S.W.; Lin, Wenxian

doi:10.1016/j.ijheatmasstransfer.2009.01.009

Cited by 8 publications

(8 citation statements)

References 34 publications

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“…The different values of h, at different positions, are explained by the heterogeneities of the water and air movement in the tank. Higher heat transfer coefficients are supposed to be associated to the regions with greater influence of impinging jets, as reported by literature (Erdogdu et al, 2005;Srinarayana et al, 2009;among others). However, it is important to remark that this phenomenon depends of the separation distance between water jets exit and the impingement surface, due to the spreading of the upward jets.…”

Section: Heat Transfer Coefficients In Tank Stirred By Water Injectiosupporting

confidence: 62%

Evaluation of the effects of water agitation by air injection and water recirculation on the heat transfer coefficients in immersion cooling

Laurindo

Carciofi

Silva

et al. 2010

Journal of Food Engineering

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a b s t r a c tMost industrial food cooling is performed by air blast, water spraying and immersion cooling. Immersion cooling is simple, with low operational cost and leads to food quick cooling. The objective of this work was to investigate the influence of water agitation method (water injection, air injection and water injection coupled to a Venturi ejector) on the average heat transfer coefficient (h) between food and cooling water. Time-temperature evolutions of a sphere immersed in the cooling media were used to determine the heat transfer coefficients at different positions in a cooling tank. Air injection and water injection coupled with a Venturi ejector significantly increased the heat transfer coefficient between food and cooling water. For the investigated conditions, h was increased up to eight times, when air injection was used. However, the complex flow of bubbles and water inside the tank created heterogeneous water agitation, creating zones with different heat transfer coefficients. Furthermore, the use of water recirculation coupled with a Venturi ejector can be very convenient for cases where pressurized air is not available, but the best agitation solution depends on each case.

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Section: Heat Transfer Coefficients In Tank Stirred By Water Injectiosupporting

confidence: 62%

Evaluation of the effects of water agitation by air injection and water recirculation on the heat transfer coefficients in immersion cooling

Laurindo

Carciofi

Silva

et al. 2010

Journal of Food Engineering

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“…For impinging plumes which are the subject of the present study, the most directly comparable study of negatively buoyant fountains is that by Srinarayana et al [18]. Within the range of control parameters that we have used, three classes of flow have 315 been found, of which two were also observed in [18].…”

Section: Discussionmentioning

confidence: 58%

“…The flow then appears to approach a steady state (although our computational time was not sufficient to verify this), For small Froude numbers (exemplified in this study by computations with F r = 1.5), the plume impinges rather weakly on the ceiling and then flaps 325 from side to side, similarly to an unconfined plume. Similar flows were seen in [18] when the domain height was large; we have not varied the domain height, but we have used lower Froude numbers than in [18]. Large domain height can be considered as a proxy for small Froude number, because the height of (unconfined) plumes and fountains increases with Froude number.…”

Section: Discussionmentioning

confidence: 96%

“…Srinarayana et al [18] made a computational study of impinging plane fountains, examining how the behaviour varied with F r, Re, P r and H. The fountains were found to settle to a steady state except for Re ≥ 125 when chaotic behaviour was found, and for H > 30 when side-to-side flapping occurred. The augmented spreading distance 85 was found to scale with F r 2/3 and with H 1/2 , but to be independent of Re and P r. The same authors subsequently modelled the effect of a heat flux at the ceiling, and the resultant stratification, on an impinging plane fountain, and determined the dependence of augmented spreading distance on a dimensionless ceiling temperature as well as F r and H [19].…”

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confidence: 99%

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Numerical simulations of a line plume impinging on a ceiling in cold fresh water

George

Kay

2017

International Journal of Heat and Mass Transfer

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Laminar plumes from a line source of warm water at the base of a shallow, homogeneous body of cold water (below the temperature of maximum density)were simulated by a computational model. The plume water undergoes buoyancy reversal as it mixes with the cold ambient. If this occurs before the plume has reached the ceiling of the domain, the plume flaps from side to side. Otherwise, it spreads along the ceiling and then sinks, with a vortex enclosed between the rising plume and the sinking flow. Some of the dense, mixed water from the sinking flow is re-entrained into the rising plume, while the rest flows outwards along the floor. However, with high source temperatures, a sufficient volume of warm water eventually builds up to also form a positively buoyant gravity current along the ceiling.

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“…Although the studies on fountains commenced in the 1950s (see, e.g., [1]), they are still being extensively investigated (see, e.g., [2][3][4][5][6][7][8][9][10][11][12]). However, the studies have focused on single fountains ejected from a single source.…”

Section: Introductionmentioning

confidence: 99%

Behavior of the interaction between twin transitional round fountains in a homogeneous fluid, Part 1: Experimental study

Mahmud

Lin

Gao

et al. 2015

International Journal of Heat and Mass Transfer

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The interaction of multiple sourced fountains is very common in many applications such as computers and electronic instruments, discharge of waste water from power plants to marine environments, displacement ventilation and air conditioning of large building spaces. But the understanding of such an interaction is currently scarce. This paper is the first part of the study on the behavior of the interaction between twin transitional round fountains with equal power in a homogeneous fluid. In this paper, the interaction behavior is investigated experimentally using a noninvasive PIV technique and flow visualization over the ranges 25 ≤ Re ≤ 400 and 1 ≤ F r ≤ 5 at the fixed spacing of D/X 0 = 10, where Re and F r are the Reynolds and Froude numbers, D is the spacing between the two fountain sources, and X 0 is the radius of orifices at the fountain source. The interaction behavior is observed to be dominated by bobbing and flapping motions and is either steady, or unsteady and weakly multi-modal or strongly multi-modal, depending on the specific values of Re and F r. In a steady interaction, the bobbing-flapping motions are only present in its initial development stage and the interaction will attain a steady state in the later development stage in which the bobbing-flapping motions are no longer present and the maximum

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Impinging plane fountains in a homogeneous fluid

Cited by 8 publications

References 34 publications

Evaluation of the effects of water agitation by air injection and water recirculation on the heat transfer coefficients in immersion cooling

Evaluation of the effects of water agitation by air injection and water recirculation on the heat transfer coefficients in immersion cooling

Numerical simulations of a line plume impinging on a ceiling in cold fresh water

Behavior of the interaction between twin transitional round fountains in a homogeneous fluid, Part 1: Experimental study

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