Numerical results on laminar mixed convective heat transfer phenomenon between a confined circular cylinder and shear-thinning type nanofluids are presented. The cylinder is placed horizontally in a confined channel through which nanofluids flow vertically upward. The effect of buoyancy is same as the direction of the flow. Because of existence of mixed convection, governing continuity, momentum, and energy equations are simultaneously solved within the limitations of Boussinesq approximation. The ranges of parameters considered are: volume fraction of nanoparticles, ϕ = 0.005–0.045; Reynolds number, Re = 1–40; Richardson number, Ri = 0–40; and confinement ratio of circular cylinder, λ = 0.0625–0.5. Finally, the effects of these parameters on the streamlines, isotherm contours, individual and total drag coefficients, and local and average Nusselt numbers are thoroughly delineated. The individual and total drag coefficients decrease with the increasing both ϕ and Re; and/or with the decreasing both Ri and λ. The rate of heat transfer increases with the increasing Re, ϕ, Ri, and λ; however, at Re = 30–40, when ϕ > 0.005 and Ri < 2, the average Nusselt number decreases with the increasing Richardson number. Finally, correlations for the total drag coefficient and average Nusselt number are proposed as functions of pertinent dimensionless parameters on the basis of present numerical results.
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August 2018
Research-Article
Laminar Mixed Convection of Non-Newtonian Nanofluids Flowing Vertically Upward Across a Confined Circular Cylinder
Abhipsit Kumar Singh,
Abhipsit Kumar Singh
Department of Chemical Engineering,
Indian Institute of Technology,
Guwahati 781039, Assam, India
Indian Institute of Technology,
Guwahati 781039, Assam, India
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Nanda Kishore
Nanda Kishore
Department of Chemical Engineering,
Indian Institute of Technology,
Guwahati 781039, Assam, India
e-mails: nkishore@iitg.ernet.in;
mail2nkishore@gmail.com
Indian Institute of Technology,
Guwahati 781039, Assam, India
e-mails: nkishore@iitg.ernet.in;
mail2nkishore@gmail.com
Search for other works by this author on:
Abhipsit Kumar Singh
Department of Chemical Engineering,
Indian Institute of Technology,
Guwahati 781039, Assam, India
Indian Institute of Technology,
Guwahati 781039, Assam, India
Nanda Kishore
Department of Chemical Engineering,
Indian Institute of Technology,
Guwahati 781039, Assam, India
e-mails: nkishore@iitg.ernet.in;
mail2nkishore@gmail.com
Indian Institute of Technology,
Guwahati 781039, Assam, India
e-mails: nkishore@iitg.ernet.in;
mail2nkishore@gmail.com
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 18, 2017; final manuscript received January 10, 2018; published online May 7, 2018. Assoc. Editor: Srinath V. Ekkad.
J. Thermal Sci. Eng. Appl. Aug 2018, 10(4): 041012 (14 pages)
Published Online: May 7, 2018
Article history
Received:
April 18, 2017
Revised:
January 10, 2018
Citation
Singh, A. K., and Kishore, N. (May 7, 2018). "Laminar Mixed Convection of Non-Newtonian Nanofluids Flowing Vertically Upward Across a Confined Circular Cylinder." ASME. J. Thermal Sci. Eng. Appl. August 2018; 10(4): 041012. https://doi.org/10.1115/1.4039300
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