Hydrodynamics of octagonal culture tanks with Cornell-type dual-drain system

Gorle, J.M.R.; Terjesen, Bendik Fyhn; Summerfelt, Steven T.

doi:10.1016/j.compag.2018.06.012

Cited by 38 publications

(22 citation statements)

References 47 publications

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“…In addition to the potential bioenergetic benefits, the suspended arrays may also be positively influencing in-tank water chemistry parameters, such as the distribution and concentration of dissolved oxygen. Although velocities and water quality are more uniformly distributed in circular tanks compared to rectangular rearing units [3] [4], there is obviously still within-tank variation [9] [13] [14]. The alterations in circular tank velocity patterns from suspended enrichment observed in this study and previously described [9] may make dissolved oxygen levels more favorable throughout the entire tanks, thereby leading to improved fish growth and feeding efficiency [38] [39].…”

Section: Discussionmentioning

confidence: 72%

“…Circular tanks excel at homogeneously distributing dissolved oxygen, and eliminating biosolids [2] [3] [4], as well as providing adequate velocity for exercise [5] [6] [7] [8]. However, they cannot share tank sidewalls, precluding optimum space management [9]. Despite these floor plan limitations, circular tanks are commonly used in production aquaculture [10].…”

Section: Introductionmentioning

confidence: 99%

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Vertically-Suspended Environmental Enrichment Alters the Velocity Profiles of Circular Fish Rearing Tanks

Muggli¹,

Barnes²,

Barnes³

2019

WJET

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The inclusion of vertically-suspended environmental enrichment in circular tanks has produced substantial benefits during fish rearing. This study examined the tank water velocity profiles of four different vertically-suspended structures (rod array, extended rod array, single angle array, double angle array) and a control (no environmental enrichment) at two incoming water velocities (18.3 cm/s and 54.9 cm/s) in 1.8-m diameter circular tanks. At both of the incoming water velocities, overall water velocities throughout the tank were significantly reduced with the addition of any environmental enrichment in comparison to the control. In addition, the overall water velocities in the double angle array were significantly lower than the other three enrichment treatments.

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Section: Discussionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Vertically-Suspended Environmental Enrichment Alters the Velocity Profiles of Circular Fish Rearing Tanks

Muggli¹,

Barnes²,

Barnes³

2019

WJET

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“…In general, water rotating tangentially to the tank wall creates a second radial rotation which is fastest towards the edge of the tank, and if fast enough, carries the fish waste from the bottom of the tank to the drain [1]. However, circular tank water flow patterns can be influenced by tank dimensions, water inlet structure geometry, outlet structure numbers and locations, fish numbers and sizes, and incoming water velocity and flow [3] [9] [10] [12] [13]. Environmental enrichment present in the circular tank can also significantly affect velocity profiles [14] [15].…”

Section: Introductionmentioning

confidence: 99%

Impact of Vertically-Suspended Environmental Enrichment and Two Densities of Fish on Circular Tank Velocity Profiles

Caasi¹,

Barnes²,

Barnes³

2020

ENG

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Vertically-suspended environmental enrichment has been shown to produce improvements in fish growth during hatchery rearing in circular tanks. This study documented the effects of a novel suspended structure on the velocity profile of a 3.63-m diameter circular tank containing juvenile landlocked fall Chinook salmon (Oncorhynchus tshawytscha) at two different densities (9.0 and 34.3 kg/m 3). The addition of vertically-suspended structure to the tank significantly decreased velocities at nearly every sampling point, with velocities typically dropping from 15 cm/s without structure to less than 6 cm/s when structure was present. Fish density also significantly impacted in-tank velocities, with an inverse relationship observed between the density of fish and water velocity. Significant interactions were present among the presence or absence of structure and fish density. When structure and fish were absent, the velocity at the edge of the tank was 15.63 cm/s, which was significantly higher than the 4.75 cm/s velocity when both structure and the lower fish density were added, which was in turn significantly higher than the 2.29 cm/s velocity observed with structure and higher fish density. Despite the potentially unique features of this study, vertically-suspended environmental enrichment and the presence of fish clearly alter circular tank water velocities, which may at least partially explain the improvements in fish rearing performance observed with the use of suspended structure.

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“…In some system designs, in-tank solid particle separation by devices as a dual drain and particle traps, or next to tank devices based on sedimentation are used [2,3]. Such devices involve vortex separators, radial flow vortex or lamellar settlers as a solution for particle removal including uneaten feed [4]. For such operations, the quantification of feed sedimentation rate or modeling of in-tank (device) feed movement is of high importance to optimize rearing and operating protocols.…”

Section: Introductionmentioning

confidence: 99%

“…Here, we see the knowledge gap between (i) the general studies of the hydrodynamic flow field in aquaculture tanks [3,4,9,10], and, (ii) outstanding works on the characteristics of floating particles, e.g., feed pellets, faecal solids, [7,8,11]. The third research area, relevant for our study, concerns the investigation of two-phase flow systems, i.e., bulk liquid continuum and solid particles [12,13].…”

Section: Introductionmentioning

confidence: 99%

Experimental & Computational Fluid Dynamics Study of the Suitability of Different Solid Feed Pellets for Aquaculture Systems

et al. 2020

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Fish feed delivery is one of the challenges which fish farmers encounter daily. The main aim of the feeding process is to ensure that every fish is provided with sufficient feed to maintain desired growth rates. The properties of fish feed pellet, such as water stability, degree of swelling or floating time, are critical traits impacting feed delivery. Some considerable effort is currently being made with regard to the replacement of fish meal and fish oil with other sustainable alternative raw materials (i.e., plant or insect-based) with different properties. The main aim of this study is to investigate the motion and residence time distribution (RTD) of two types of solid feed pellets with different properties in a cylindrical fish tank. After experimental identification of material and geometrical properties of both types of pellets, a detailed 3D computational fluid dynamics (CFD) study for each type of pellets is performed. The mean residence time of pellets injected at the surface of the fish tank can differ by up to 75% depending on the position of the injection. The smallest residence time is when the position is located at the center of the liquid surface (17 s); the largest is near the edge of the tank (75 s). The maximum difference between the two studied types of pellets is 25% and it increases with positions closer to the center of the tank. The maximum difference for positions along the perimeter at 3/4 tank radius is 8%; the largest residence times are observed at the opposite side of the water inlet. Based on this study, we argue that the suitability of different solid feed pellets for aquaculture systems with specific fish can be determined, and eventually the pellet composition (formula) as well as the injection position can be optimized.

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Hydrodynamics of octagonal culture tanks with Cornell-type dual-drain system

Cited by 38 publications

References 47 publications

Vertically-Suspended Environmental Enrichment Alters the Velocity Profiles of Circular Fish Rearing Tanks

Vertically-Suspended Environmental Enrichment Alters the Velocity Profiles of Circular Fish Rearing Tanks

Impact of Vertically-Suspended Environmental Enrichment and Two Densities of Fish on Circular Tank Velocity Profiles

Experimental & Computational Fluid Dynamics Study of the Suitability of Different Solid Feed Pellets for Aquaculture Systems

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