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6 publications

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    PBE-based Drop Dynamics Simulation in an Unbaffled Stirred Tank Reactor

    By S. Somasundaram, Shekhar Kumar, V. Vijayakumar

    Abstract: The population balance equation (PBE)-based model describes the distribution of drop size with respective to its size. In this work, 30% TBP was dispersed in 4N nitric acid solution by turbine impeller. Drop-size distributions were measured with a 630 nm laser-based particle size analyzer. For daughter drop density function, a normal distribution function was considered. For breakage rate, Voigt model of Chen et al. was used in the simulation [1]. …

    Published in Journal of Nuclear Engineering & Technology · Vol. 6, Issue 1, 2016 · pp. 25–35 Read article

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    Volumetric Properties of PEG-400 in FS-13 Diluent for 293.15 K to 343.15 K at 0.1 MPa

    By Pranay Kumar Sinha, Shekhar Kumar, U. Kamachi Mudali

    Abstract: PEG-400 in FS-13 solvent was proposed for strontium extraction from spent fuel solution in back end of nuclear fuel cycles. Densities and viscosities of solutions of PEG-400 and FS-13 were not available in literature. Densities and viscosities of binary mixture of extractant PEG-400 in FS-13 diluent was measured from 293.15 to 323.15 K. The excess molar volume (VE) and excess Gibb’s free energy of activation (DGE) was evaluated from density …

    Published in Journal of Nuclear Engineering & Technology · Vol. 5, Issue 3, 2015 · pp. 1–5 Read article

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    Organic Phase Speciation of 36% Tri-Iso Amyl Phosphate/N-Dodecane Solvent during Nitric Acid Extraction

    By Ravi kant Srivastav, S. Balasubramonian, Shekhar Kumar, D. Sivakumar, M. Sampath, U. Kamachi Mudali

    Abstract: Several solutions of 36% TiAP/n-dodecane solvent were equilibrated with different concentrations of aqueous nitric acid solutions at 298.15 K at a phase ratio of unity. The resultant equilibrated aqueous and organic solutions were analyzed for acidity. A three-solvate model with molecular HNO3 based mechanism was assumed for nitric acid extraction by TiAP. This model was analogous to the 3-solvate model for nitric acid extraction by TBP, recently reported by authors. …

    Published in Journal of Nuclear Engineering & Technology · Vol. 5, Issue 2, 2015 · pp. 28–34 Read article

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    Estimation of Aqueous Solubility of Tri-n-Butyl Phosphate by Refractive Index Measurement at 298.15 K

    By D. Sivakumar, Shekhar Kumar, U. Kamachi Mudali

    Abstract: Presence of dissolved tri-n-butyl phosphate (TBP) in the aqueous nitric acid solutions, can lead to runaway reactions in presence of nitric acid at temperature more than 130o C. Therefore, the concentration of dissolved TBP in the aqueous nitric solutions is an important control parameter for safe operation of product/waste evaporators. The experimental measurements of refractive index of six aqueous solutions of TBP in the range of 0-400 mg/L were performed …

    Published in Journal of Nuclear Engineering & Technology · Vol. 5, Issue 2, 2015 · pp. 24–27 Read article

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    Characterization of Formed Third Phase in the Nitric Acid-30% TBP/n-Dodecane System

    By Bijendra Kumar, Shekhar Kumar, Pranay Kumar Sinha, U. Kamachi Mudali

    Abstract: In solvent extraction operations, limited solubility of extracted solvate in the organic phase results in partitioning of the later into two phases, called light organic and heavy organic phase respectively. The phenomenon is studied well and reported for tetravalent actinides in TBP systems but nitric acid third phase in TBP systems was almost neglected. In this study, nitric acid third phase was generated for TBP system and its characterization has …

    Published in Journal of Nuclear Engineering & Technology · Vol. 5, Issue 2, 2015 · pp. 13–19 Read article

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    PVT Properties of Alternate PUREX diluent 4,4-Dipropyl Heptane

    By S. Balasubramonian Balasubramonian, Shekhar Kumar, D. Sivakumar, U. Kamachi Mudali

    Abstract: 4,4-Dipropyl Heptane (Hydrogenated propylene tetramer) is an alternate diluent for PUREX process, employed for reprocessing of spent nuclear fuel. Its PVT properties are not available in literature. With group contribution method, PVT properties of 4,4-dipropyl heptane were estimated and reported in this work. A corresponding- states based equation as well as Wagner constants were also reported in the range of 273.15K to critical temperature. Keywords: PVT properties, 4, 4-dipropyl heptane, …

    Published in Journal of Nuclear Engineering & Technology · Vol. 5, Issue 2, 2015 · pp. 20–23 Read article

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