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Afshin Maleki,Amir Hossein Mahvi,Roya Ebrahimi,Yahya Zandsalimi 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
The degradation of two commercially available dyestuffs (C.I. Reactive Black 5 and C.I. Disperse Orange 25) by ultraviolet radiation (UV), ultrasonic irradiation (US), UV/H2O2 and US/H2O2 processes was investigated in a laboratory-scale batch photoreactor equipped with a 55 W immersed-type low-pressure mercury vapor lamp and a sonoreactor with low frequency (42 kHz) plate type transducer at 170W of acoustic power. The toxicity was also evaluated in acute toxicity studies using Daphnia magna. Results showed that color removal efficiencies by US and US/H2O2processes were negligible for both dyes. Almost complete disappearance of Reactive Black 5 (97.9%) in UV/H2O2 process was possible after 5 min of irradiation. The maximum color removal efficiency of Disperse Orange 25 after 10min of irradiation, however, was only 9.2% and reached a maximum value of 41% after 120 min of irradiation. Pseudofirst order kinetics with respect to dyestuffs concentrations was found to fit all the experimental data. The results clearly showed that both dyes examined were toxic to D. magna and resulted in quite low LC50 values.
Mohammad Moshfeghi,Amir Maleki,Morteza Ramezani,Nahmkeon Hur(허남건) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.2
In the following years, the wind energy industry will maintain its surge during the last few decades. Meanwhile, horizontal axis wind turbines (HAWT) are the most prominent one among other wind turbines. Accordingly, enhancing blade aerodynamic performance should be the main part of study over this type of turbines. For this purpose, various active and passive flow control methods are being extensively investigated. Investigating new hybrid method is the main aim of this paper. Therefore, in this present study a novel idea, that uses a paddle wheel which is located inside the split, is investigated. This new configuration is based on the split method and the rotation of a paddle wheel that provides pulsatile flow inside the split. The flow then gets injected into the bulk flow over the airfoil, causing hybrid flow control effects. Optimized split geometry of S809 airfoil has been selected and then a paddle wheel is placed inside the split. First, the effect of split width on passing flow and separation zone was investigated. Second, the effect of rotational speed of the paddle is discussed. To this end, 2D CFD simulations using SST-k-ω turbulence model have been performed. The simulations have been conducted for a wide range of angles of attack (AOA). The results are discussed in the form of aerodynamics force coefficients as well as streamlines to compare the size of the separation area at higher angles of attack.