Entropy Analysis of Nanofluid flow in a Fluidized Bed Dryer in Presence of Induced Magnetic Field

Article Sidebar

PDF
DOI: https://doi.org/10.28924/2291-8639-22-2024-40
Published: Mar 4, 2024
Cite as:
Kiptum J. Purity, Mathew N. Kinyanjui, Edward R. Onyango, Entropy Analysis of Nanofluid flow in a Fluidized Bed Dryer in Presence of Induced Magnetic Field, Int. J. Anal. Appl., 22 (2024), 40.

Main Article Content

Kiptum J. Purity, Mathew N. Kinyanjui, Edward R. Onyango

Abstract

The study investigates generation of entropy in an unsteady, incompressible nanofluid flow occurring within a fluidized bed dryer used in tea processing industries. The study considered the presence of variable magnetic field, influence of viscous dissipation, thermal radiation and chemical reaction. The nonlinear partial differential equations of momentum, energy and concentration were derived. A finite difference numerical scheme was employed to obtain an approximate solution for the nonlinear partial differential equations governing the flow. Entropy generation is then determined from velocity, concentration and temperature profiles obtained from solution of momentum, mass and energy equations. The study illustrated the impact of various flow parameters on entropy generation and Bejan number through graphical presentations while numerical values for skin friction coefficient, heat and mass transfer rates were provided in tabular form. Study of entropy generation allows one identify factors which contribute to energy inefficiencies in a thermal system and allows different stakeholders or designers of bed dryers in tea factories identify ways of improving the dryer or designing more effective dryers. Bejan number is used in thermodynamics to evaluate efficiency of thermal systems such as fluidized bed dryers. It helps one design heat exchangers which maximizes heat transfer while minimizing energy losses. The findings of this study are essential in improving the performance, efficiency and the design of a fluidized bed dryer involving heat and mass transfer as well as fluid flow.

Article Details

References

  1. R. Clausius, The Mechanical Theory of Heat, Macmillan, London, 1879.
  2. A. Bejan, A Study of Entropy Generation in Fundamental Convective Heat Transfer, J. Heat Transfer. 101 (1979), 718–725. https://doi.org/10.1115/1.3451063.
  3. A. Bejan, Second-Law Analysis in Heat Transfer and Thermal Design, Adv. Heat Transfer. 15 (1982), 1–58. https://doi.org/10.1016/s0065-2717(08)70172-2.
  4. A. Bejan, The thermodynamic design of heat and mass transfer processes and devices, Int. J. Heat Fluid Flow. 8 (1987), 258–276. https://doi.org/10.1016/0142-727x(87)90062-2.
  5. A. Bejan, Method of entropy generation minimization, or modeling and optimization based on combined heat transfer and thermodynamics, Rev. Gén. Therm. 35 (1996), 637–646. https://doi.org/10.1016/s0035-3159(96)80059-6.
  6. V. Bulgakov, I. Sevostianov, G. Kaletnik, I. Babyn, S. Ivanovs, I. Holovach, Y. Ihnatiev, Theoretical Studies of the Vibration Process of the Dryer for Waste of Food, Rural Sustain. Res. 44 (2020), 32–45. https://doi.org/10.2478/plua-2020-0015.
  7. H. Inaba, H. Syahrul, A. Horibe, N. Haruki, Heat and Mass Transfer Analysis of Fluidized Bed Grain Drying, Mem. Fac. Eng. Okayama Univ. 41 (2007), 52–62. https://doi.org/10.18926/14084.
  8. M. Deymi-Dashtebayaz, A. Arabkoohsar, F. Darabian, Energy and Exergy Analysis of Fluidised Bed Citric Acid Dryers, Int. J. Exergy. 22 (2017), 218–234. https://doi.org/10.1504/ijex.2017.083169.
  9. S. A. H. Razavikia, H. amirzade, V.Ehterami, R. moeinzadeh, E. kianfar, Modeling Thermodynamic Drying Bed Fluid, MEANJIN - Arts Human. J. 7 (2015), 163–172.
  10. S.U. Choi, J.A. Eastman, Enhancing Thermal Conductivity of Fluids With Nanoparticles, Tech. Rep., Argonne National Lab. (ANL), Argonne, IL, United States, (1995).
  11. A. El Jery, N. Hidouri, M. Magherbi, A.B. Brahim, Effect of an External Oriented Magnetic Field on Entropy Generation in Natural Convection, Entropy. 12 (2010), 1391–1417. https://doi.org/10.3390/e12061391.
  12. S. Das, R.N. Jana, Natural Convective Magneto-Nanofluid Flow and Radiative Heat Transfer Past a Moving Vertical Plate, Alexandria Eng. J. 54 (2015), 55–64. https://doi.org/10.1016/j.aej.2015.01.001.
  13. R. Mehta, V.S. Chouhan, T. Mehta, Mhd Flow of Nanofluids in the Presence of Porous Media, Radiation and Heat Generation Through a Vertical Channel, J. Phys.: Conf. Ser. 1504 (2020), 012008. https://doi.org/10.1088/1742-6596/1504/1/012008.
  14. H. Ullah, T. Hayat, S. Ahmad, M.S. Alhodaly, Entropy Generation and Heat Transfer Analysis in Power-Law Fluid Flow: Finite Difference Method, Int. Commun. Heat Mass Transfer. 122 (2021), 105111. https://doi.org/10.1016/j.icheatmasstransfer.2021.105111.
  15. A. Riaz, A. Zeeshan, M.M. Bhatti, Entropy Analysis on a Three-Dimensional Wavy Flow of Eyring-Powell Nanofluid: A Comparative Study, Math. Probl. Eng. 2021 (2021), 6672158. https://doi.org/10.1155/2021/6672158.
  16. A. Motevali, R. Amiri Chayjan, Effect of Various Drying Bed on Thermodynamic Characteristics, Case Stud. Thermal Eng. 10 (2017), 399–406. https://doi.org/10.1016/j.csite.2017.09.007.