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Jang C.-M.,Korea Institute of Construction Technology | Han G.-Y.,Dh m Co.
Journal of Thermal Science | Year: 2010

This paper describes the shape optimization of an impeller used for two-stage high pressure ring blower. Two shape variables, which are used to define an impeller shape, are introduced to increase the blower performance. The pressure of a blower is selected as an object function, and the blade optimization is performed by a response surface method. Three-dimensional Navier-Stokes equations are introduced to analyze the internal flow of the blower and to find the value of object function for the training data. Relatively good agreement between experimental measurements and numerical simulation is obtained in the present study. Throughout the shape optimization, it is found that a hub height is effective to increase pressure in the ring blower. The pressure rise for the optimal two-stage ring blower is successfully increased up to 1.86% compared with that of reference at the design flow rate. Local recirculation flow having low velocity is formed in both sides of the impeller outlet by different flow direction of the inlet and outlet of the impeller. Detailed flow field inside the ring blower is also analyzed and discussed. © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg 2010. © Science Press and Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg 2010.


Tak B.-Y.,DH M CO. | Tak B.-S.,DH M CO. | Kim Y.-J.,DH M CO. | Park Y.-J.,Korea Europe Environment Energy Expert Forum 3825 Seodongdae ro | And 2 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2015

The present work aims to study the removal of color and COD from livestock wastewater by electrocoagulation (EC) process using Al electrodes. The Box-Behnken design and response surface methodology were used to investigate the effects of major operating variables and optimization conditions. The predicted values of responses obtained using the response function agree well with the experimental data. Economical operating conditions and removal efficiencies were found to be pH of 8, current density of 30mA/cm2, electrolysis time of 30min and NaCl concentration of 1g/L, and 95.2% (Y1) and 93% (Y2), respectively. © 2015 The Authors.

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