01938nas a2200229   4500008004100000022001400041245008500055210006900140260009100209300002000300490000600320520108100326653003301407653002501440653001701465653002901482653002001511100002101531700002601552700001901578856011101597       2008                        eng d  a1542-658000aCFD simulation of gas-liquid flows in a reactor stirred by dual rushton turbines0 aCFD simulation of gasliquid flows in a reactor stirred by dual r  a2809 TELEGRAPH AVENUE, STE 202, BERKELEY, CA 94705 USAbBERKELEY ELECTRONIC PRESScJAN  aArticle No. A600 v63 a<p>In the present work, we have simulated gas-liquid flows in a tall stirred reactor equipped with dual Rushton turbines. A two fluid model along with the standard k-epsilon turbulence model and modified drag coefficient, (proposed by Khopkar &amp; Ranade, 2006) accounting for the effect of bulk turbulence, was used to simulate the dispersed gas-liquid flow in a stirred reactor. The multiple reference frames (MRF) approach was used to simulate impeller rotation in a fully baffled reactor. The computational model was mapped on to a commercial solver FLUENT 6.2 (of Fluent Inc. USA). The model was used to simulate three distinct flow regimes in a gas-liquid stirred reactor: L33-VC (lower impeller-upper impeller), S33-VC and VC-VC. The model predictions were compared with the published experimental data of Bombac &amp; Zun (2000). The predicted results show good agreement with the experimental data for all the three flow regimes. The computational model presented in this work would be useful for simulating different flow regimes in a gas-liquid stirred vessel.</p>10acomputational fluid dynamics10adual Rushton turbine10aFlow regimes10agas hold-up distribution10astirred reactor1 aKasat, Gopal, R.1 aPandit, Aniruddha, B.1 aRanade, V., V.  uhttps://library.ncl.res.in/content/cfd-simulation-gas-liquid-flows-reactor-stirred-dual-rushton-turbines-001648nas a2200169   4500008004100000022001400041245006400055210006400119260007100183300001600254490000700270520103000277100002201307700002201329700002601351856010101377       2014                        eng d  a0888-588500aCrystal shape evolution using polyhedral population balance0 aCrystal shape evolution using polyhedral population balance  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcDEC  a18966-189740 v533 a<p>Research on crystal morphology covers shape evolution of single crystal and evolution of the size and shape distribution of populations of crystals. The population balance models have been used for the single or multiple dimensions for predicting the evolution of crystal size distributions (CSDs). More often than not these models do not consider the change in solute concentration due to disappearance/appearance of the crystal faces and therefore compromise rigorous mass balance. The present work focuses on the methodology for the morphological evolution of crystal shape using a polyhedral population balance model. This methodology is based on the morphodrome which illustrates the shapes of crystals at various operating conditions. gPROMS software (PSE, UK) along with Microsoft Excel is used to devise the framework for predicting the crystal shape evolution. The developed approach and models can be implemented for various crystallization systems and will be useful for simulating crystal shape evolutions.</p>1 aShaikh, Latif, J.1 aRanade, Vivek, V.1 aPandit, Aniruddha, B.  uhttps://library.ncl.res.in/content/crystal-shape-evolution-using-polyhedral-population-balance-001742nas a2200181   4500008004100000022001400041245010900055210006900164260007100233300001600304490000700320520102000327100002201347700001901369700002201388700002601410856012401436       2015                        eng d  a0888-588500aGeneric framework for crystallization processes using the population balance model and its applicability0 aGeneric framework for crystallization processes using the popula  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcOCT  a10539-105480 v543 a<p>A generic modeling framework for batch cooling crystallization processes has been developed to understand the crystallization process from operational and modeling point of view. The generic framework for crystallization process modeling incorporates the characteristic dimensions of crystals and polymorphic transformation, as well as the hydrodynamic mixing effects in the crystallizer. This Polyhedral Polymorphic Multizonal Population Balance (PPMPBM) model considers bottom-up and top-down approaches for specific systems with specific targets. The PPMPBM framework allows switching between complex and simple models to study different crystallization systems with different scenarios and combination thereof. This framework uses gPROMS software (PSE, UK) and the Microsoft Excel front-end, along with the Polytope module in Matlab, to predict the crystal size and shape evolution as well as supersaturation profiles inside the crystallizer, which can be implemented for various crystallization systems.</p>1 aShaikh, Latif, J.1 aBari, Atul, H.1 aRanade, Vivek, V.1 aPandit, Aniruddha, B.  uhttps://library.ncl.res.in/content/generic-framework-crystallization-processes-using-population-balance-model-and-its-002304nas a2200265   4500008004100000022001400041245016000055210006900215260007300284300001200357490000700369520129300376653001101669653002201680653001301702653001701715653002801732653002601760100002401786700002301810700002201833700002601855700002601881856013101907       2016                        eng d  a1350-417700aIntensification of degradation of methomyl (carbamate group pesticide) by using the combination of ultrasonic cavitation and process intensifying additives0 aIntensification of degradation of methomyl carbamate group pesti  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL  a135-1420 v313 a<p>In the present work, the degradation of methomyl has been carried out by using the ultrasound cavitation (US) and its combination with H2O2, Fenton and photo-Fenton process. The study of effect of operating pH and ultrasound power density has indicated that maximum extent of degradation of 28.57% could be obtained at the optimal pH of 2.5 and power density of 0.155 W/mL. Application of US in combination with H2O2, Fenton and photo-Fenton process has further accelerated the rate of degradation of methomyl with complete degradation of methomyl in 27 min, 18 min and 9 min respectively. Mineralization study has proved that a combination of US and photo -Fenton process is the most effective process with maximum extent of mineralization of 78.8%. Comparison of energy efficiency and cost effectiveness of various processes has indicated that the electrical cost of 79892.34 Rs./m(3) for ultrasonic degradation of methomyl has drastically reduced to 2277.00 Rs./m(3), 1518.00 Rs./m(3) and 807.58 Rs./m(3) by using US in combination with H2O2, Fenton and photo-Fenton process respectively. The cost analysis has also indicated that the combination of US and photo-Fenton process is the most energy efficient and cost effective process. (C) 2015 Elsevier B.V. All rights reserved.</p>10aFenton10aHydrogen peroxide10aMethomyl10aPhoto-Fenton10aSynergistic coefficient10aUltrasound cavitation1 aRaut-Jadhav, Sunita1 aPinjari, Dipak, V.1 aSaini, Daulat, R.1 aSonawane, Shirish, H.1 aPandit, Aniruddha, B.  uhttps://library.ncl.res.in/content/intensification-degradation-methomyl-carbamate-group-pesticide-using-combination-ultrasonic02597nas a2200277   4500008004100000022001400041245015200055210006900207260006900276300001200345490000800357520155100365653002701916653002801943653002201971653003401993653001002027653001202037100002402049700002202073700002302095700002202118700002602140700002602166856012702192       2016                        eng d  a1385-894700aTreatment of the pesticide industry effluent using hydrodynamic cavitation and its combination with process intensifying additives (H2O2 and ozone)0 aTreatment of the pesticide industry effluent using hydrodynamic   aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcJUL  a326-3350 v2953 a<p>Hydrodynamic cavitation (HC) and its combination with H2O2 and ozone have been applied in the present work for the treatment of industrial pesticide effluent. Initially, the effect of dilution of the effluent on the efficacy of hydrodynamic cavitation has been studied using circular venturi as a cavitator. Although an increase in the extent of dilution has not shown any beneficial effect on the actual moles of pollutant degraded, hybrid processes have been studied using 1:5 dilution due to very high TDS content of the effluent. Treatment of the industrial pesticide effluent using HC + ozone (3 gbh) process has demonstrated that the biodegradability index (BI) of the effluent increases from 0.123 to 0.324 after 2 h of operation. The rate of COD and TOC reduction has also increased by many folds by using HC in combination with ozone. In addition this, the treatment of industrial pesticide effluent using HC + H2O2 has also indicated that the rate of COD and TOC reduction increases significantly by using HC in combination with various loadings of H2O2. The study of interference of added H2O2 on the COD analysis has exhibited that the COD equivalence is 0.441 mg/L for 1 mg/L of H2O2. The energy efficiency and operating cost of various hybrid processes have been compared based on the cavitational yield and the cost of electricity. The combined process of HC and H2O2 has observed to be the most cost-effective one due to its higher cavitational yield and lower power consumption. (C) 2016 Elsevier B.V. All rights reserved.</p>10aBiodegradability index10aHydrodynamic cavitation10aHydrogen peroxide10aIndustrial pesticide effluent10aOzone10aVenturi1 aRaut-Jadhav, Sunita1 aBadve, Mandar, P.1 aPinjari, Dipak, V.1 aSaini, Daulat, R.1 aSonawane, Shirish, H.1 aPandit, Aniruddha, B.  uhttps://library.ncl.res.in/content/treatment-pesticide-industry-effluent-using-hydrodynamic-cavitation-and-its-combination01649nas a2200229   4500008004100000022001400041245006600055210006600121260000800187300001200195490000800207520093000215653002501145653003001170653000901200100002101209700001701230700002501247700002301272700002601295856009801321       2019                        eng d  a0025-540800aImproved efficiency of DSSC using combustion synthesized TiO20 aImproved efficiency of DSSC using combustion synthesized TiO2  cJAN  a222-2260 v1093 a<p>Combustion synthesis method is an economic, one step and an effective method for the synthesis of nanomaterials. In this work, titanium dioxide nanoparticles were synthesized by combustion method. The synthesized material was characterized by XRD, SEM and BET. Dye sensitized solar cell was fabricated using the synthesized material and its performance was compared with the solar cell fabricated using commercial TiO2. In order to evaluate the photovoltaic performance of DSSCs, photocurrent density to photovoltage (J-V) characteristic and electrochemical impedance spectroscopy (EIS) measurements were carried out. The DSSC fabricated using combustion synthesized and commercial TiO2 exhibited a power conversion efficiency of 6.11% and 6.62%, respectively. Combustion synthesized TiO2 which displayed similar efficiency to that of commercial material is least studied in the literature for solar cell applications.</p>10aCombustion synthesis10aDye sensitized solar cell10aTiO21 aUmale, Sanjivani1 aSudhakar, V.1 aSontakke, Sharad, M.1 aKrishnamoorthy, K.1 aPandit, Aniruddha, B.  uhttps://library.ncl.res.in/content/improved-efficiency-dssc-using-combustion-synthesized-tio201973nas a2200157   4500008004100000022001400041245009400055210006900149260000800218300001400226490000700240520139400247100002601641700002601667856012201693       2025                        eng d  a0888-588500aUltrasound emulsification: effect of additives on dispersed phase volume and droplet size0 aUltrasound emulsification effect of additives on dispersed phase  cJAN  a3409-34250 v643 a<p>
	Ultrasonic emulsification of oil and water was carried out to observe the effect of addition of a minimal amount of surfactant. The effect of ultrasound irradiation time, power, and physicochemical properties of oil on the dispersed phase volume and dispersed phase droplet size has been studied. The increase in the irradiation time increases the dispersed phase volume, while it decreases the dispersed phase droplets size. With an increase in the ultrasonic irradiation power, there is an increase in the fraction of volume of the dispersed phase, while the droplet size of the dispersed phase decreases over the same irradiation time. The fractional volume of the dispersed phase is higher for the case of the groundnut oil-water system, while it is low for the paraffin (heavy) oil-water system. The droplet size of soyabean oil dispersed in water is found to be small, while that of paraffin (heavy) oil is found to be large. These variations could be explained on the basis of varying physicochemical properties of the system, i.e., viscosity of oil and the interfacial tension. During the ultrasonic emulsification, a coalescence phenomenon which is relatively weak has also been observed, which can be attributed to the collision of small droplets when the droplet concentration increases (higher dispersed phase hold-up) and the acoustic streaming strength is higher.</p>
1 aGaikwad, Shashank, G.1 aPandit, Aniruddha, B.  uhttps://library.ncl.res.in/content/ultrasound-emulsification-effect-additives-dispersed-phase-volume-and-droplet-size