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RISS 인기검색어
- 검색키워드
- 저자 : G. Suresh Kumara (검색결과 5 건)
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Tushar Sharma,G. Suresh Kumara,전보현,Jitendra S. Sangwai 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Pickering emulsion offers potential applications in several fields including oil and gas industry due totheir enhanced stability. Oil-in-water (o/w) emulsions are usually stabilized by surfactant ornanoparticle or by both but show poor thermal stability which limits their use for high-temperatureapplications. In this work, a novel formulation of o/w emulsion stabilized using nanoparticle-surfactantpolymersystem is investigated for the formulation of thermally stable Pickering emulsion. Theconventional oilfield polymer polyacrylamide (PAM), surfactant, sodium dodecylsulfate (SDS), andnanoparticles such as, SiO2, clay, and CuO in varying concentration are used. It is observed that thenanoparticle in the presence of surfactant and polymer synergistically interacted at the oil–waterinterface. The effect of temperature, pH, and salinity on the interfacial tension is investigated tounderstand the thermal stability. The emulsion system with partially hydrophobic clay nanoparticles inthe presence of PAM and SDS shows higher thermal stability as compared to fully hydrophilic SiO2nanoparticles. In the presence of salt, NaCl (1.0 wt%), the thermal stability of clay and SiO2 stabilizedemulsions is observed to be further promoted at higher temperatures. Scanning electron microscopy(SEM) images confirm the existence of a structured and rigid layer of nanoparticle at the oil–waterinterface.
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Tushar Sharma,G. Suresh Kumara,전보현,Jitendra S. Sangwai 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.4
Information on the viscosity of Pickering emulsion is required for their successful application in upstreamoil and gas industry to understand their stability at extreme environment. In this work, a novel formulationof oil-in-water (o/w) Pickering emulsion stabilized using nanoparticle-surfactant-polymer (polyacrylamide)system as formulated in our earlier work (Sharma et al., Journal of Industrial and Engineering Chemistry,2014) is investigated for rheological stability at high pressure and high temperature (HPHT) conditionsusing a controlled-strain rheometer. The nanoparticle (SiO2 and clay) concentration is varied from 1.0 to 5.0wt%. The results are compared with the rheological behavior of simple o/w emulsion stabilized by surfactant-polymer system. Both the emulsions exhibit non-Newtonian shear thinning behavior. A positive shiftin this behavior is observed for surfactant-polymer stabilized emulsion at high pressure conditions. Yieldstress is observed to increase with pressure for surfactant-polymer emulsion. In addition, increase in temperaturehas an adverse effect on the viscosity of emulsion stabilized by surfactant-polymer system. In caseof nanoparticle-surfactant-polymer stabilized o/w emulsion system, the viscosity and yield stress are predominantlyconstant for varying pressure and temperature conditions. The viscosity data for both o/w emulsionsystems are fitted by the Herschel-Bulkley model and found to be satisfactory. In general, the studyindicates that the Pickering emulsion stabilized by nanoparticle-surfactant-polymer system shows improvedand stable rheological properties as compared to conventional emulsion stabilized by surfactant-polymersystem indicating their successful application for HPHT environment in upstream oil and gas industry.
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Tushar Sharma,Jitendra S. Sangwai,G. Suresh Kumara 한국자원공학회 2014 Geosystem engineering Vol.17 No.3
A conventional waterflood often leads to unsuccessful recovery of oil, as most of the injected water tends to channel into the more permeable zones. Pickering emulsions stabilized using surfactant and colloidal particles, such as nanoparticles, are gaining wider recognition in the petroleum industry due to their better thermal stability and stabilized flow behavior. In this work, a novel formulation of oil-in-water (o/w) emulsion stabilized using nanoparticle–surfactant–polymer in the presence of salt (NaCl) is investigated for improved oil recovery at conditions of high pressure (13.6MPa) and high temperature (313–363 K).We report a comparative study of performance of o/w emulsion flooding with conventional water flooding for enhanced oil recovery of a crude oil having a viscosity of 161 mPa s at 313K in a Berea sandstone core using core-flood experiments. The results of core flooding tests show that an incremental oil recovery of more than 23% of original oil in place over water flooding can be obtained using an emulsion flooding formulated in this work.
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V. Geetha,V. P. Mayookha,Moumita Das,G. Suresh Kumara 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.7
The majority of bioactive polysaccharides are present in some marine creatures. These polysaccharides are considered as promising anti-obesity agents, their anti-obesity properties involve a number of mechanisms, including suppression of lipid metabolism and absorption, impact on satiety, and prevention of adipocyte differentiation. Obesity is linked to type 2 diabetes, cardiovascular disease, and other metabolic syndromes. In this review various bioactive polysaccharides like chitin, chitosan, fucosylated chondroitin sulphate, chitooligosaccharides and glycosaminoglycans have been discussed for their anti-obesity effects through various pathways. Critical evaluation of observational studies and intervention trials on obesity, lipid hypertrophy, dyslipidemia, and type 2 diabetes was done with a primary focus on specific marine fauna polysaccharide as a source of seafood that is consumed all over the world. It has been observed that consumption of individual seafood constituents was effective in reducing obesity. Thus, marine derived novel bioactive polysaccharides have potential applications in food and pharmaceutical industries.
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Effect of Sips Sorption Isotherm on Contaminant Transport Mechanism in Fractured Porous Media
Effect of Sips Sorption Isotherm on Contaminant Transport Mechanism,G. Suresh Kumara 대한토목학회 2016 KSCE Journal of Civil Engineering Vol.20 No.5
A numerical model has been developed in this study for analysing the influence of Sips sorption isotherm on the contaminant transport mechanism in a coupled fracture matrix system. The implicit finite difference numerical technique has been used to solve the coupled non-linear governing equations. A varying grid is adopted at the fracture and rock matrix interface to capture the mass transfer at the interface. A constant continuous source of contaminants is assumed at the inlet of the fracture and the fracture is assumed to be saturated. Results suggest that the magnitude of the Sip’s equilibrium constant in the fracture is extremely sensitive in deciding the resultant transport behaviour within the high permeable fracture. The magnitude of the Sip’s model exponent within the high permeable fracture is highly sensitive in deciding the timing of zero concentration (exhaustion) within the high permeable fracture.
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