Goruganthula Venkata Subrahmanya Sarma

@andhrauniversity.edu.in

Associate Professor, Department of Chemical Engineering,
Andhra University

Goruganthula Venkata Subrahmanya Sarma


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https://researchid.co/gvssarma

RESEARCH INTERESTS

Mineral processing Engg, Mass Transfer, Biosorption,
28

Scopus Publications

Scopus Publications

  • Preliminary studies on microbial induced corrosion of ferrous materials (EN-8 and 411143 steels) in the presence of Acidithiobacillus ferrooxidans
    Indian Journal of Biochemistry and Biophysics, 2023
    An electrochemical investigation was conducted to evaluate the corrosion behaviour of Iron alloys such as EN-8 and 411143 in absence and in presence of microbes Acidithiobacillus ferrooxidans. Linear polarization technique was employed to measure the Polarization Resistance and corrosion rates of two different ferrous metal samples. Polarization resistance (Rp) values of EN-8 were initially higher in the presence of Acidithiobacillus ferrooxidans than the values of 411143. Growth rate of the Acidithiobacillus ferrooxidans was more and sustained longer period with EN-8 in the presence of media than in the case of alloy ‘411143’. It was observed that there was a 1.5 fold increase in corrosion rate in both the cases of EN-8 and 411143 in the presence of bacteria.High corrosion rates were recorded with the steel 41143 rather than the En-8 with respect to the optical density of the microbes. It was concluded that EN-8 was exhibited high resistance to the microbial attack.
  • Ionic Mass Transfer in Electrolyte–Kerosene Flow Systems
    K. Ashok Kumar, G. V. S. Sarma, K. V. Ramesh
    Lecture Notes in Mechanical Engineering, 2023
  • Synthesis and Characterization of a Novel Nanocarbon Derived Nanoporous Al2O3 Powder as a Potential Adsorbent for Treatment of Wastewater
    K. Sarath Chandra, D. Suharika, Debasish Sarkar, G. V. S. Sarma, K. V. Ramesh
    Lecture Notes in Mechanical Engineering, 2023
  • Effect of temperature and chain length of added primary amines on the sphere to rod transition of aqueous ionic micelles
    Indian Journal of Biochemistry and Biophysics, 2022
    The importance of micelles as templates for nanomaterials is growing day by day. This resulted in an increasing interest for micelles in different sizes and shapes. Addition of n-amines to micellar solutions was found to bring change in the shape of the micelles from sphere to rod in aqueous ionic micellar solutions. The change in shape is qualitatively obtained from sudden change in the slope of pH versus amine concentration plots because the degree or protonation of n-alkylamines depends on the shape of micelles. In the present investigation, pH is measured at different temperatures to elucidate the influence of addition of n-amines on sphere-to-rod transition in aqueous micellar solutions. The surfactants employed in the present investigation are cetyltrimethyl ammonium bromide (CTAB), cetylpyridinium chloride (CPC), and sodium dodecyl sulphate (SDS).As the amine concentration is increased, the pH increases linearly at certain amine concentration and the slope of the resulting straight line changes on further addition of amine. It is noticed that increasing temperature requires more amine for structural transition of aqueous ionic micelles. It is also observed that the effectiveness of added amines leading to shape transition from sphere to rod is in the order of C8NH2>C7NH2> C6NH2.
  • Application of Response Surface Methodology for Effective Recovery of Indian Coking Coal Fines Through Froth Flotation Technique
    G. V. S. Sarma, A. Kumar Sanjay, K. Sarath Chandra, G. M. J. Raju, K. V. Ramesh, Sanjay Chaudari, T. Gouri Charan
    Journal of the Institution of Engineers India Series D, 2022
    Samples of the coking coal fines from the settling ponds of the nearby washeries were collected and tested for their cleaning potentialities by conducting systematic beneficiation studies. Response surface methodology (RSM) with central composite design was employed to optimize the input variables by maintaining other parameters constant to get maximum yield of clean coal. A second-order regression equation that resulted from two-factor interaction (2FI) method was found to be the most appropriate one to correlate experimental data. The analysis of suitability of selected model of the present experimental data was substantiated by the correlation coefficient value of 0.8815. Lower values of coefficient of variance (CV) also supported the model fitness to experimental design. Higher values of efficiency index, separation index, rate constant and separation efficiency rates are additional parameters that supported the performance of the frother. The optimum dosages of collector and frother were found to be 0.8 ml and 80 ml respectively for obtaining maximum yield of clean coal.
  • Electrochemical mass transfer in bubble columns with conical entry in the presence of displaced devices
    G. V. S. Sarma, P. Swarnadhar, M. Vijay, K. V. Ramesh
    Aip Conference Proceedings, 2021
    An investigation had been carried out to study the effect on mass transfer between flowing fluid and column wall in gas-liquid system with different internals. Doublecone, disc and sphere promoters were the displaced devices used. The liquid phase was an electrolyte solution. The gas phase was nitrogen. The study revealed that the velocities of fluids and location promoter had no effect on mass transfer coefficient. The kL was observed not to have any significant effect with the characteristic length of the promoter elements. The kL data were correlated in terms of Colburn j-factor and Reynolds number.
  • Effect of fluidizing solids on wall-liquid mass transfer in a cylindrical cell with rotating central rod
    G. M. J. Raju, G. V. S. Sarma, K. V. Ramesh, C. Bhaskara Sarma
    Heat and Mass Transfer Waerme Und Stoffuebertragung, 2021
    Limiting current density data were obtained at point electrodes fixed flush with inner surface of the outer cylinder of an electrochemical cell in which a coaxially placed cylindrical rod is rotated at different rotational velocities in the presence of fluidizing solids. The variables covered in the present study are rpm of inner annular rod, diameter of rod, solid fraction and flow rate of the electrolyte. Mass transfer coefficients, which were computed from limiting current density data, were found to increase with an increase in the velocity of the fluid electrolyte through the annular cell in the presence of fluidizing solids. No specific trend was observed with respect to the rpm of the central annular rod. The variation in mass transfer coefficient values due to change in the rod diameter was just marginal. The bed expansion data represented Richardson-Zaki equation with an exponent of 2.15. Colburn jD-factor format has been used to correlate the data on mass transfer coefficients.
  • Kinetic studies of esterification of butanoic acid with cyclohexanol
    G.V.S. Sarma, G.V. Santosh Kumar, M. Vijay, K.V. Ramesh
    Materials Today Proceedings, 2021
    Kinetic studies of esterification of butanoic acid with cyclohexanol were carried out using sulplhuric acid as catalyst. Experiments were conducted in a stirred, temperature controlled batch reactor. The reaction is homogeneous. The effects of different variables that influence the rate constant such as temperature, catalyst concentration and mole ratio of reactants were studied. The reaction rate followed second order with respect to the acid concentration. The mole ratio is varied between 0.5 and 2.0, temperature between 50 and 70 °C and catalyst concentration between 0.5 and 1.5 wt%. An equation is obtained for the prediction of rate constant.
  • Mass transfer at the confining wall of an electrochemical cell in annular flow with a rotating central rod
    G. M. Jagannadha Raju, G. V. S. Sarma, K. V. Ramesh, C. Bhaskara Sarma
    Indian Chemical Engineer, 2021
    An electrochemical method (limiting current technique) was used to obtain mass transfer coefficient (k L) in a flow reactor in which the coaxial inner cylindrical rod was rotated at different revolutions per minute (rpm). The effect of liquid velocity, rpm and rod diameter on the liquid-wall mass transfer coefficient was investigated. It was observed that at any given rpm, the k L increased with the liquid velocity. Rotation of the central rod was found to further augment the coefficient. Augmentations were found to be more significant at small liquid velocities. The effect of central (annular) rod diameter was also studied and the k L data were correlated using Colburn j-factor format. GRAPHICAL ABSTRACT
  • Modified Laterite Adsorbent for Cadmium Removal from Wastewater
    Kothamuri Sudha Rani, Goruganthula Venkata Subrahmanya Sarma, Karri Gouru Naidu, Kasala Venkata Ramesh
    Journal of the Institution of Engineers India Series D, 2020
    Being a toxic metal, the presence of cadmium in water leads to damage of health in human beings. Effluents from various processes and industries inevitably contain cadmium as remnant, and its removal is necessary to meet with the existing statutory norms. So far, many adsorbents are used in the industry, but most of them are rather costly. Therefore, a cheaper and effective adsorbent, modified laterite is used in the present investigation as an alternative. Batch studies are conducted to elicit information on operating variables (pH, temperature, adsorbent dosage, initial concentration and contact time). In the present study, optimum values for these variables are reported as 7.0, 30 °C, 6 g/L, 100 mg/L and 30 min, respectively. Maximum cadmium uptake obtained was 100 mg/g. The kinetic data were in good agreement with pseudo-second-order model. Also Langmuir, Freundlich and Temkin isotherms were obeyed. From thermodynamic calculations, a change in enthalpy was found to be 170 J/mol.
  • Potential removal of phenol using modified laterite adsorbent
    Indian Journal of Biochemistry and Biophysics, 2020
  • Mass transfer at the confining wall of a minichannel
    K. Ashok Kumar, G.V.S. Sarma, K.V. Ramesh
    Materials Today Proceedings, 2020
  • Mass transfer enhancement in a two-phase flow electrochemical reactor
    M. Vijay, G.V.S. Sarma, D.U.S.L. Deepthi, K.V. Ramesh
    Materials Today Proceedings, 2020
  • Effect of spray nozzle-hole diameter on performance of 1 kw PEM fuel cell with honeycomb candle humidifier
    G. Vasu, B. Sreenivasulu, G. Sirisha, G.V.S. Sarma, K.V. Ramesh
    Materials Today Proceedings, 2020
  • Mass transfer at the confining wall of a coiled flow inverter
    G. V. S. Sarma, B. S. Subramanyam, M. S. N. Murty, K. V. Ramesh
    Heat and Mass Transfer Waerme Und Stoffuebertragung, 2019
  • Adsorptive removal of chromium by modified laterite
    K. Sudha Rani, G.V.S. Sarma, K. Gouru Naidu, K.V. Ramesh
    Materials Today Proceedings, 2019
  • Improvement Trail on Recovery of Cadmium from Low-Grade Sulfide Ore Through Bioleaching Using Acidithiobacillus ferrooxidans
    G. V. S. Sarma, G. M. J. Raju, E. N. Dhananjaya Rao, C. Bhaskara Sarma
    Journal of the Institution of Engineers India Series D, 2018
  • Effect of Humidifier Temperatures on Nafion-XL Membrane Electrode Assemblies (MEA) - An Experimental Study
    G. Vasu, B. Sreenivasulu, G.V.S. Sarma, D. Arjun, B. Anusha, K.V. Ramesh
    Materials Today Proceedings, 2018
  • Effect of temperature on the viscosities of mixed micellar solutions
    C. Durga Prasad, D. Sudheer Kumar, G. V. S. Sarma, K. V. Ramesh
    Aip Conference Proceedings, 2017
  • Simple and stability indicating RP-HPLC assay method development and validation of telmisartan in bulk and dosage form
    Der Pharmacia Lettre, 2015
  • Mass transfer at confining wall of an electrochemical cell with coaxially rotating composite promoter
    G.M. Jagannadha Raju, G.V.S. Sarma, K.V. Ramesh, C. Bhaskara Sarma
    International Journal of Heat and Mass Transfer, 2014
  • Wall-To-Bulk Mass Transfer in a Gas Liquid Upflow Bubble Column
    G. M. J. Raju, K. V. Ramesh, G. V. S. Sarma
    Journal of the Institution of Engineers India Series E, 2013
  • Wall-to-bed mass transfer in an electrochemical cell with coaxially rotating composite promoter in the presence of fluidizing solids
    G. M. Jagannadha Raju, K. V. Ramesh, G. V. S. Sarma, C. Bhaskara Sarma
    Chemical Engineering Communications, 2011
  • Mass transfer at the confining wall of helically coiled circular tubes in the absence and presence of packed solids
    R. Harvind Kumar, K.V. Ramesh, G.V.S. Sarma, G.M.J. Raju
    International Communications in Heat and Mass Transfer, 2011
  • Mass transfer at the confining wall of helically coiled circular tubes with gas-liquid flow and fluidized beds
    T. Anil Kumar, G.M.J. Raju, G.V.S. Sarma, K.V. Ramesh
    Chemical Engineering Journal, 2009
  • Effectiveness of thermoil granodine against the corrosion of aluminum and Al-Cu alloy in chloride solutions
    Indian Journal of Chemical Technology, 2009
  • Effect of internal on phase holdups of a three-phase fluidized bed
    K.V. Ramesh, G.M.J. Raju, G.V.S. Sarma, C. Bhaskara Sarma
    Chemical Engineering Journal, 2009
  • Biosorption studies for removal of chromium using immobilized marine alga Isochrysis galbana
    Indian Journal of Marine Sciences, 2006