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Turbulence, Secondary Clarifier, Concentration, Activated Sludge, Modified Casson Model
Thanapalan Murugesan,Iyyaswami Regupathi,Ponnan Ettiyappan JagadeeshBabu,M. Chitra 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4
Drag reduction is one of the most important techniques for reducing energy consumption in a packed bed contactor. The present work involves an experimental investigation on flow regime transition for air-water system with and without drag reducing agent (DRA), two-phase pressure drop, friction factor and drag reduction using xanthan gum as DRA. Drag reduction was quantified from the two-phase pressure drop data. Based on the present observations it was found that the percentage drag reduction increases with an increase in the concentration of DRA and it is only effective in the range of 300 ppm to 800 ppm. The experimental results indicate that a maximum of 80% drag reduction was achievable using xanthan gum (800 ppm) as DRA. Furthermore, the experimental data were validated with the available literature correlations.
Zeeshan Rashid,Cecilia Devi Wilfred,Regupathi Iyyaswami,Arunagiri Appusamy,Murugesan Thanabalan 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
Dispersion of asphaltene in crude oil using ionic liquids (ILs) is being considered as a viable solution, inextraction and transportation processes. In this work, the interplay between asphaltene and ILs has beenstudied systematically to understand the effect of structural variation of ILs on asphaltene solubility. Theactivity coefficient of the total of 1517 ILs with different combinations of cation and anion of ILs forrepresentative asphaltene molecule (asphaltene) was estimated via COSMO-RS (Conductor-likeScreening Model for Real Solvents). COSMO_RS predictions were validated using experimental dataon asphaltene solubility. Among the studied ILs, asphaltene showed high solubility in imidazolium-basedILs with hydrophobic anions. The present approach paved a way forward to rationally understand theimpact of structural variation of ILs on their interaction with asphaltene molecule and to design new ILsfor the dispersion and stabilization of asphaltene.