Avinash Chandra
Thapar University
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Publication
Featured researches published by Avinash Chandra.
Numerical Heat Transfer Part A-applications | 2013
Avinash Chandra; R.P. Chhabra
Flow and heat transfer from a semi-circular cylinder to power-law fluids has been studied in the laminar vortex shedding regime for the range of conditions as follows: Reynolds number, 40 ≤ Re ≤ 140; Prandtl number, 0.7 ≤ Pr ≤ 50; and power-law index, 0.2 ≤ n ≤ 1.8. Extensive results are presented in terms of the streamline, vorticity and isotherm profiles, drag and lift coefficients, Strouhal number, and Nusselt number. The influence of Reynolds number, Prandtl number, and power-law index are seen to be more prominent in shear-thinning fluids (n < 1) than that in shear-thickening (n > 1) fluids. The shear-thinning fluid behavior enhances the rate of heat transfer, whereas shear-thickening fluid behavior impedes it.
Applied Radiation and Isotopes | 2016
Meenakshi Sheoran; Sunil Goswami; H.J. Pant; Jayashree Biswal; Vijay Sharma; Avinash Chandra; Haripada Bhunia; Pramod K. Bajpai; S. Madhukar Rao; Ashutosh Dash
A series of radiotracer experiments was carried out to measure residence time distribution (RTD) of liquid phase (alkali) in an industrial-scale continuous pulp digester in a paper industry in India. Bromine-82 as ammonium bromide was used as a radiotracer. Experiments were carried out at different biomass and white liquor flow rates. The measured RTD data were treated and mean residence times in individual digester tubes as well in the whole digester were determined. The RTD was also analyzed to identify flow abnormalities and investigate flow dynamics of the liquid phase in the pulp digester. Flow channeling was observed in the first section (tube 1) of the digester. Both axial dispersion and tanks-in-series with backmixing models preceded with a plug flow component were used to simulate the measured RTD and quantify the degree of axial mixing. Based on the study, optimum conditions for operating the digester were proposed.
Chemical Engineering Communications | 2018
Meenakshi Sheoran; Avinash Chandra; Haripada Bhunia; Pramod K. Bajpai; H.J. Pant
ABSTRACT Use of radiotracer in residence time distribution (RTD) studies in industrial as well as lab scale systems has been emphasized in this review. The advantages of radiotracer over conventional tracers are discussed. The injection and detection protocols of the radiotracers are explained. The pretreatment of RTD data obtained and RTD modeling are explained using industrial- and laboratory-scale studies. The detailed RTD studies in (i) oil and gas, (ii) pharmaceuticals and bioprocesses, (iii) fertilizers and pesticides, (iv) polymer, plastic and fiber, (v) mineral processing, organic and inorganic chemicals, (vi) laboratory scale, (vii) pilot plant scale, and (viii) wastewater treatment processes are considered for this review. The case studies are also explained with RTD experiments. The current trend on the application of radiotracer technology in industry is also explained.
International Journal of Heat and Mass Transfer | 2011
Avinash Chandra; R.P. Chhabra
International Journal of Heat and Mass Transfer | 2012
Avinash Chandra; R.P. Chhabra
Applied Mathematical Modelling | 2011
Avinash Chandra; R.P. Chhabra
International Journal of Heat and Mass Transfer | 2011
Avinash Chandra; R.P. Chhabra
International Journal of Heat and Mass Transfer | 2012
Avinash Chandra; R.P. Chhabra
Journal of Molecular Liquids | 2016
Arghya Datta; Dipaloy Datta; Avinash Chandra
World Academy of Science, Engineering and Technology, International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering | 2012
Avinash Chandra; R.P. Chhabra