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Effect of fluidizing solids on wall-liquid mass transfer in a cylindrical cell with rotating central rod

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Abstract

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.

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Abbreviations

A:

area of reacting surface, m2

Cb :

concentration of reacting ion, kmol/m3

dp :

particle diameter, m

DL :

diffusion coefficient, m2/s

Dr :

annular rod diameter, m

dt :

diameter of tangential inlet, m

E:

applied voltage, V

i:

current, A

iL :

limiting current, A

kL :

mass transfer coefficient, m/s

Rc :

inner radius of outer cylinder in the test section, m

Rr :

radius of annular rod, m

V:

velocity of fluid, m/s

jD :

mass transfer factor = kLSc2/3/V

Rep :

particle Reynolds number = ρLdpV/μL

Sc:

Schmidt number = μL/(ρLDL)

ε:

void fraction

ρL :

liquid density, kg/m3

μL :

liquid viscosity, kg/(m.s)

References

  1. Rao VRK, Murthy PS (1965) Proceedings of the symposium on fluidization and related process held at Kharagpur, India, 179

  2. JagannadhaRaju GJV, VenkataRao C (1965) Ionic mass transfer in the presence of fluidized solids. Indian J Technol 3:201–205

    Google Scholar 

  3. Coeuret F, Legrand J (1981) Mass transfer at the electrodes of concentric cylindrical reactors combining axial flow and rotation at the inner cylinder. Electrochim Acta. https://doi.org/10.1016/0013-4686(81)85047-5

  4. Legrand J, Coeuret F (1982) Overall walls to liquid mass transfer for flows combining Taylor vortexes and axial forced convection. Int J Heat Mass Transf. https://doi.org/10.1016/0017-9310(82)90187-9

  5. Coeuret F, Legrand J (1983) Mass and momentum transfer at the rotating surface of a continuous annular electrochemical reactor. Electrochim Acta. https://doi.org/10.1016/0013-4686(83)85053-1

  6. Cohen S, Marom DM (1983) Experimental and theoretical study of a rotating annular flow reactor. Chem Eng J. https://doi.org/10.1016/0300-9467(83)80055-0

  7. Legentihomme P, Legrand J (1991) Effects of inlet conditions on mass transfer in annular swirling decaying flow. Int J Heat Mass Transf. https://doi.org/10.1016/0017-9310(91)90036-E

  8. Ohamura N, Makino T, Motomura A, Shibata Y, Kataoka K (1998) Intercellular mass transfer in wavy/turbulent Taylor vortex flow. Int J Heat Fluid Flow. https://doi.org/10.1016/S0142-727X(97)10020-0

  9. Lodh BB, Murthy GSRN, Murthi PS (1970) The effect of spiral coils and twisted tapes as augmentators on heat and momentum transfer with gas solid mixtures. Br Chem Eng 15:73–77

    Google Scholar 

  10. Sitaraman TS (1977) Augmentation of Mass Transfer by coaxial string of spheres as internals in tubes and fluidized beds. PhD Thesis. University of Madras, Madras, India

  11. Sarveswara Rao S (1983) Studies on Ionic Mass Transfer with coaxially placed cones on a rod in homogeneous fluid and fluidized beds.PhD Thesis. Andhra University, Visakhapatnam, India

  12. Sujatha V (1991) Studies on ionic mass transfer with coaxially placed helical tapes on a rod in homogeneous and fluidized beds.PhD Thesis. Andhra University, Visakhapatnam, India

  13. Jagannadha Raju GM, Sarma GVS, Ramesh KV, Bhaskara Sarma C (2020) Mass transfer at the confining wall of an electrochemical cell in annular flow with a rotating central rod. Indian Chem Eng. https://doi.org/10.1080/00194506.2020.1784801

  14. Richardson JF, Zaki WN (1954) Sedimentation and fluidization part-I. Trans Inst. Chem Eng 32:35–53

    Google Scholar 

  15. Changal Raju D, BhaskaraSarma C, JagannadhaRaju GJV (1988) Mass transfer at stationary outer cylinder with concentric inner cylinder rotating. J Energy Heat Mass Transf 10:25–31

    Google Scholar 

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Acknowledgements

Authors are very grateful to Mr. K. Sarath Babu for his help while doing the experimentation in the Electrochemical and Corrosion Engineering Laboratory, Department of Chemical Engineering, Andhra University, Visakhapatnam.

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Authors and Affiliations

  1. Department of Chemical Engineering, Andhra University, Visakhapatnam, 530003, India

    G. M. J. Raju, G. V. S. Sarma & K. V. Ramesh

  2. GVP college of Engineering for Women, Visakhapatnam, 530048, India

    C. Bhaskara Sarma

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  1. G. M. J. Raju
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  2. G. V. S. Sarma
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  3. K. V. Ramesh
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  4. C. Bhaskara Sarma
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Correspondence to G. V. S. Sarma.

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Raju, G.M.J., Sarma, G.V.S., Ramesh, K.V. et al. Effect of fluidizing solids on wall-liquid mass transfer in a cylindrical cell with rotating central rod. Heat Mass Transfer 57, 1139–1144 (2021). https://doi.org/10.1007/s00231-020-03007-4

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