Design characteristics of Curved Blade Aerator w.r.t. aeration efficiency and overall oxygen transfer coefficient and comparison with CFD modeling

Bhuyar, Lalit B.; Thakre, SB; Ingole, N.W.

doi:10.4314/ijest.v1i1.58055

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…Suggestions have been made for improving the oxygen transfer capacity of aerators used in shrimp farming, for example, Boyd (1998), Bhuyar, Thakre, and Ingole (2009), Bahri, Setiawan, Hermawan, and Zairin Jr. (2017), Roy, Moulick, and Mal (2017), Boyd, Torrans, and Tucker (2018), but little progress has resulted. Shrimp pond aeration is still accomplished mainly with small, floating, electric paddlewheel aerators or long-arm aerators, many of which are farm-made.…”

Section: Aerator Efficiencymentioning

confidence: 99%

Aerator energy use in shrimp farming and means for improvement

Boyd

McNevin

2020

J World Aquaculture Soc

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Estimates of aeration energy use in shrimp farming varied from 11.4 to 41.6 GJ/t shrimp (average = 19.8 GJ/t). Several opportunities for reducing energy use in aeration are available. Many farms adopt an excessive yield to installed aeration capacity ratio. Moreover, the proportion of installed aerator capacity in use and duration of aerator operation per day are often more than necessary during the initial two-thirds of grow-out, because adjustment is not made for the quantity of shrimp biomass. Farm-made, long-arm aerators used in Asia have several features leading to energy inefficiency and could be replaced by more efficient factorymade, long-arm aerators. Asian aquaculture aerator manufacturers should redesign aerators to include design features shown in research to improve efficiency. Dissolved oxygen concentration monitoring essential for verification of aeration performance is seldom performed by shrimp farmers. With good aeration technique, energy use for aeration should not exceed 10-15 GJ/t shrimp.

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Section: Aerator Efficiencymentioning

confidence: 99%

Aerator energy use in shrimp farming and means for improvement

Boyd

McNevin

2020

J World Aquaculture Soc

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“…The capability of the developed system to follow the expected voltage based on the voltage output generated in the defuzzification indicates that fuzzy logic is applicable in controlling the rotation speed of the paddle wheel of an aerator. This fuzzy logic control has not been implemented yet on existing aerators [4,11,12]. The ability of the system to maintain the dissolved oxygen was also tested.…”

Section: B Testing Of the Systemmentioning

confidence: 99%

“…Therefore, artificial aeration through mechanical aerators becomes essential for the semi-intensive and intensive type of aquaculture. Aerator creates a greater amount of contact between the air and water to enhance the transfer of gases [4]. By mechanically altering the water, the air is being introduced allowing the water to increase its concentration of dissolved oxygen.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Logic Controlled Paddle Wheel Aerator

Abana*,

Lorenzo,

Argal

et al. 2019

IJRTE

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Aeration, as an essential process in the aquaculture industry, has incorporated mechanical aerators especially paddle wheel which is dubbed as the most efficient type. However, an operation of such a device depends on traditional on/off mechanisms based on human intuitions when the need for aeration is necessary. In this paper, Mamdani Fuzzy Logic was integrated into automating the paddlewheel aerator to control and to ensure the correct level of dissolved oxygen in ponds. A microcontroller based on the received output from the dissolved oxygen sensor is capable of automatically controlling the impellers appropriate to the current environment condition. Series of testing was conducted to look at the accuracy of the sensing mechanism and a mean relative error of 1.32% was detected. The researchers compared theoretical and actual supply voltage for all possible dissolved oxygen readings and interpreted a 0.73% mean relative error. With the incorporation of Fuzzy Logic Controller, the system was able to maintain 6 parts per million in the test environment. The system can also reduce power consumption to 65.13% compared to traditional switching. The aerator developed in this study can be used in maintaining the dissolved oxygen in aquaculture farms without human intervention.

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“…With CFD, it is more convenient to obtain all relevant environmental information within the simulation zone and the airflow pattern could be analyzed quantitatively and qualitatively. Likewise, CFD was commonly used in the research and optimization of the airflow field in the civil architecture as well as the waste disposal, like optimization of the inlet position for the natural ventilated-building [16] ; evaluating the performance of the activated sludge system [17,18] ; exploring the flow field in the sludge management device [19,20] ; investigating the airflow pattern in the biogas digester with the optimized shape of the stirrer [21] ; comparing airflow conditions under the varied mixing parameters for the fermentation system [22,23] . However, the application of CFD in analyzing the airflow field in the compost pile is rare.…”

Section: Introduction mentioning

confidence: 99%

Airflow field simulation model building and application for aerobic compost using CFD

Cheng¹,

HaiBo²,

Zhou³

et al. 2021

International Journal of Agricultural and Biological Engineering

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Composting is a suitable low-cost strategy to transform animal waste into a stabilized end product, and the airflow field in the pile affects the fermentation states. For piles in the aeration weak zone, anaerobic fermentation may happen as the lack of oxygen. While in practice, due to the extremely low speed and harsh condition, the airflow field was scarcely researched. This study adopted Computational Fluid Dynamics (CFD) to investigate the airflow field in the compost pile. A three-dimensional CFD model was built; the compost pile in this model was simplified as porous media; unstructured mesh was adopted to discretize the geometric model; standard k-ε model and SIMPLE scheme were employed for numerical methods. The CFD model was validated with the field experiment in the cooling period. Then the model was applied to research the airflow field in the pile with increased pipe diameter. Results showed that it was feasible to investigate the airflow field in the pile with CFD. For boundary conditions in the CFD model, treating the compost pile as a homogeneous porous media is reasonable. The CFD model was successfully validated by the field measurement (the average relative difference between the simulated and measured air speed was within 10%). Airflow in the existing compost pile showed nonuniform distribution with stagnation and vortex zones; the turbulence intensities were 3.57 and 1.43 for the airflow in the pile and the reactor, respectively. When pipe diameter increased, the airflow distribution uniformity in the pile was improved significantly. With diameter raising to 0.04 m, the turbulence intensity decreased to 1.54 and 0.42 for the airflow in the pile and the reactor, respectively. The CFD model developed in this research can provide qualitative and quantitative analyses of the airflow field in compost piles, and can be a theoretical basis for the aeration system design.

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Design characteristics of Curved Blade Aerator w.r.t. aeration efficiency and overall oxygen transfer coefficient and comparison with CFD modeling

Cited by 10 publications

References 14 publications

Aerator energy use in shrimp farming and means for improvement

Aerator energy use in shrimp farming and means for improvement

Fuzzy Logic Controlled Paddle Wheel Aerator

Airflow field simulation model building and application for aerobic compost using CFD

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