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RISS 인기검색어
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- 저자 : Rahmat Sotudeh-Gharebagh (검색결과 5 건)
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Farhad Karimi,Rahmat Sotudeh-Gharebagh,Reza Zarghami,Mojgan Abbasi,Navid Mostoufi 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.5
Wetted rice particles were dried in a fluidized bed and the corresponding passive acoustic emissions signals (AES) were recorded at a given frequency to study the drying phenomena and bed hydrodynamic changes as well. The results show that the end time of the constant rate zone and the end of the falling rate can be determined from the variation of standard deviation and kurtosis of AES, respectively. Frequency domain analysis was also used to quantify the moisture content of solids. For this end, the original signal was decomposed into ten sub-signals, and it was found that the energy of the 4th sub-signal can be correlated with the moisture content. The results show that the acoustic emission measurement is applicable as a practical method for on-line condition monitoring of drying process in fluidized bed dryers.
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Characterization of flow properties of pharmaceutical pellets in draft tube conical spout-fluid beds
Mohammad Foroughi-Dahr,Rahmat Sotudeh-Gharebagh,Navid Mostoufi 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Experimental studies of the hydrodynamic performance of the draft tube conical spout-fluid bed (DCSF) were conducted using pharmaceutical pellets. The experiments were carried out in a DCSF consisted of two sections: (a) a conical section with the cross section of 120 mm × 250 mm and the height of 270 mm, (b) a cylindrical section with the diameter of 250 mm and the height of 600 mm. The flow characteristics of solids were investigated with a high speed camera and a pezoresistive absolute pressure transducer simultaneously. These characteristics revealed different flow regimes in the DCSF: packed bed at low gas velocities, fluidized bed in draft tube at higher gas velocities until minimum spouting, and spouted bed. The stable spouting was identified by the presence of two dominant frequencies of the power spectrum density of pressure fluctuation signature: (i) the frequency band 6–9 Hz and (ii) the frequency band 12–15 Hz. The pressure drops across the draft tube as well as the annulus measured in order to better recognize the flow structure in the DCSF. It was observed that the pressure drop across the draft tube, the pressure drop across the annulus, and the minimum spouting velocity increase with the increase in the height of draft tube and distance of the entrainment zone, but with the decrease in the distributor hole pitch. Finally, this study provided novel insight into the hydrodynamic of DCSF, particularly minimum spouting and stable spouting in the DCSF which contains valuable information for process design and scale-up of spouted bed equipment.
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이산화티탄 나노입자 필러가 PET와 PLA 나노복합체의 특성에 미치는 영향
Seyed Mohammad Ali Mousavi,Mehdi Farhoodi,Saeed Dadashi,Rahmat Sotudeh Gharebagh,Zahra Emam Djomeh,Abdolrasul Oromiehie,Farkhondeh Hemmati 한국고분자학회 2012 폴리머 Vol.36 No.6
Two types of polymers were tested in this study; poly(ethylene terephthalate) (PET) as a synthetic example and poly(lactic acid) (PLA) as a natural polymer. DSC analyses showed that the use of nanofiller increased the degree of crystallinity (Xc) of both PET and PLA polymers, but the effect was more noticeable on PET nanocomposites. The crystallization of PLA and PET nanocomposites occurred at higher temperatures in comparison to neat polymers. According to dynamic mechanical-thermal analysis (DMTA), the damping factor of PET/TiO2 nanoparticles decreased compared to the neat matrix, but for PLA nanocomposites the opposite trend was observed. Results of the mechanical test showed that for both PET and PLA nanocomposites, the most successful toughening effect was observed at 3 wt% loading of TiO2 nanoparticles. SEM micrographs revealed uniform distribution of TiO2 nanoparticles at 1 and 3 wt% loading levels. The results of WAXD spectra explained that the polymorphs of PLA and PET was not affected by TiO2 nanoparticles. UV-visible spectra showed that TiO2 nanocomposite films had high ultraviolet shielding compared to neat polymer, but there was significant reduction in transparency.
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Influence of TiO<sub>2</sub> Nanoparticle Filler on the Properties of PET and PLA Nanocomposites
Farhoodi, Mehdi,Dadashi, Saeed,Mousavi, Seyed Mohammad Ali,Sotudeh-Gharebagh, Rahmat,Emam-Djomeh, Zahra,Oromiehie, Abdolrasul,Hemmati, Farkhondeh The Polymer Society of Korea 2012 폴리머 Vol.36 No.6
Two types of polymers were tested in this study; poly(ethylene terephthalate) (PET) as a synthetic example and poly(lactic acid) (PLA) as a natural polymer. DSC analyses showed that the use of nanofiller increased the degree of crystallinity ($X_c$) of both PET and PLA polymers, but the effect was more noticeable on PET nanocomposites. The crystallization of PLA and PET nanocomposites occurred at higher temperatures in comparison to neat polymers. According to dynamic mechanical-thermal analysis (DMTA), the damping factor of PET/$TiO_2$ nanoparticles decreased compared to the neat matrix, but for PLA nanocomposites the opposite trend was observed. Results of the mechanical test showed that for both PET and PLA nanocomposites, the most successful toughening effect was observed at 3 wt% loading of $TiO_2$ nanoparticles. SEM micrographs revealed uniform distribution of $TiO_2$ nanoparticles at 1 and 3 wt% loading levels. The results of WAXD spectra explained that the polymorphs of PLA and PET was not affected by $TiO_2$ nanoparticles. UV-visible spectra showed that $TiO_2$ nanocomposite films had high ultraviolet shielding compared to neat polymer, but there was significant reduction in transparency.
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Mohammad Hajaghazadeh,Vincenzo Vaiano,Diana Sannino,Hossein Kakooei,Rahmat Sotudeh-Gharebagh 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
The effect of operating parameters on gas phase photocatalytic oxidation of methyl ethyl ketone (MEK) hasbeen investigated over P25 and PC500 photocatalysts. The parameters were gas flow rate, relative humidity (RH), reactiontemperature, and ultraviolet intensity. The photoreactor was composed of two LEDs matrices and a fluidized bedreactor (LED-FBR). No mass transfer limitation phenomena occurred at flow rates in the range 30-70 NL/h. The oxidationof MEK over the two photocatalysts did not highly depend on the presence or absence of humidity in the airstream. Temperature was determined as an important parameter in conversion of MEK over 60 to 120 oC, influencingalso the selectivity to carbon dioxide and carbon monoxide. The simultaneous influence of RH and temperature wasobserved in the reaction at different temperatures and RHs, evidencing the decrease in the selectivity towards CO withincrease of RH. With the increase of ultraviolet intensity, the rate of MEK oxidation increased over both catalysts, withthe better activity of PC500 than P25 particularly at higher light intensities. The main effect of temperature was both topromote the MEK conversion and to limit the competitive water adsorption in the PCO reaction over the tested titanias.
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