Performance evaluation of venturi aeration system |
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| Affiliation: | 1. ADS Environmental Services Sdn. Bhd., Lot 1-1 (Mc No.2), Likas, 88400, Kota Kinabalu, Sabah, Malaysia;2. Department of Physics and Physical Oceanography Memorial University of Newfoundland, St. John''s, NL, A1B 3X7, Canada;3. Northwest Atlantic Fisheries Centre, 80 East White Hills, St John''s, Newfoundland and Labrador, A1C 5X1, Canada;1. Doctorado en Acuicultura, Programa Cooperativo, Universidad de Chile, Universidad Católica del Norte, Pontificia Universidad Católica de Valparaíso, Chile;2. Departamento de Acuicultura, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo, 1281, Coquimbo, Chile;3. Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Unidad Regional de Desarrollo Científico y Tecnológico (CONICYT), Colina El Pino s/n, La Serena, Chile;1. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, Hangzhou 310027, PR China;2. College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, PR China;3. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, PR China;1. Samaria and the Jordan Rift Regional R&D Center, Science park, Ariel, 4070000, Israel;2. Big O.D.Y. LTD. Neve Yamin, 4492000, Israel;3. Yuvalim Regional Water Corporations LTD., Industry Park, Ariel, 4070000, Israel;1. School of Mechanical Engineering, Shanghai Jiao Tong University, 200240, China;2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, China |
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| Abstract: | The venturi aeration is an effective practice to increase the dissolved oxygen accessibility in the water bodies. This study aims to optimize the various geometrical parameters of the venturi aeration system. A non-dimensional technique was applied to find the optimum performance of various geometric parameters i.e. throat lengths (tl), number of air holes (N), and converging and diverging angles (α and β). These experiments have been carried out using 1124 L capacity of tank having dimensions of 105 cm long, 105 cm wide and 102 cm deep. The experiments were conducted at a constant flow velocity of water (1.096 m/s) with varying throat length (tl = 20–100 mm keeping 20 mm as interval between two consecutive length), number of air holes (N = 1–17 at an equal hole to hole distance of 5 mm between them), and converging and diverging angles (α and β = 10°, 15°, 20° and 25°). Multiple non-linear regression equations were also developed from the linear relation with the dependent variable (Non-dimensional form of standard aeration efficiency, NDSAE) and independent variables (tl and N). With the geometrically optimized venturi aerator the optimum performance was found for tl =100 mm, N = 17, and α and β = 15°. The maximum value of standard oxygen transfer rate (SOTR) and standard aeration efficiency (SAE) obtained was 0.0216 kgO2/h and 0.611 kgO2/kWh respectively. From the non-dimensional study, it was found that the NDSAE is the function Reynolds number (Re) and Froude number (Fr). The simulation equations were developed on the basis of Re and Fr for NDSAE, and subjected to 7.378 × 10?6 < Re < 3.689 × 10-5 and 0.163 < Fr < 0.817, respectively. |
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| Keywords: | Venturi aeration Dissolved oxygen Dimensional analysis Standard aeration efficiency Oxygen transfer Aquaculture |
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