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Mohammadreza Kamali,Seyed Ali Jazayeri,Farid Najafi,Kenji Kawashima,Toshiharu Kagawa 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.5
This paper introduces a new nozzle-flapper valve with isothermal chamber using piezoelectric actuator. It controls the pressure and flow rate simply, effectively and separately. The proposed valve uses isothermal chamber presenting practical isothermal condition due to its large heat transfer interfaces filled by metal wool. The valve uses stacked type piezoelectric actuator with unique advantages. By using this valve, a simple method has been fulfilled to control flow rate or pressure of ideal gases in a pneumatic actuators. Experimental results demonstrated applications of the proposed valve to control either pressure or flow rate in pneumatic circuits. This valve can be also used in the pilot stage valve to actuate the main stage of a much bigger pneumatic valve. Designated structure contains only one pressure sensor installed on the isothermal control chamber, capable of controlling both pressure and flow rate. The desired output mass flow rate of the valve is controlled by the pressure changes during positioning of piezoelectric actuator at proper position. The proposed valve can control steady and unsteady oscillatory flow rate and pressure effectively, using nonlinear control method such as feedback linearization approach. Its effectiveness is demonstrated and validated through simulation and experiments.
Saeideh Kamali Moghaddam,Mohammadhossein Rasoulifard,Morteza Vahedpour,Mohammadreza Eskandarian 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
The present work deals with the photooxidative degradation of tylosin antibiotic (TYL) in the presenceof potassium peroxydisulfate (K2S2O8) irradiated by UV-C in the presence of immobilized nano silver. Effects of pH,temperature, peroxydisulfate concentration and immobilized nano silver dosage on the degradation efficiency of TYLwere examined. Degradation efficiency was small when the oxidation was carried out in the absence of UV irradiation. Results showed that degradation of TYL increases with temperature, nano Ag and peroxydisulfate initial concentra-tion and decreases with pH. Due to UV/nano Ag/S2O82−processes, more than 90% of TYL can be degraded at roomtemperature in 35 min at an initial concentration of 50 mgl−1. Degradation reaction order of TYL by UV/nano Ag/S2O82−process is 1.89. Meanwhile, the initial rates of degradation in UV/nano Ag/S2O82−processes can be described well bythe Langmuir-Hinshelwood kinetic model.