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Research Papers: Jets, Wakes, and Impingment Cooling

Cooling of a Partially Elastic Isothermal Surface by Nanofluids Jet Impingement

[+] Author and Article Information
Fatih Selimefendigil

Department of Mechanical Engineering,
Celal Bayar Univeristy,
Manisa 45140, Turkey
e-mail: fatih.selimefendigil@cbu.edu.tr

Hakan F. Öztop

Professor
Department of Mechanical Engineering,
Technology Faculty,
Firat University,
Elaziğ 23119, Turkey
e-mail: hfoztop1@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 3, 2017; final manuscript received September 10, 2017; published online January 10, 2018. Assoc. Editor: Yuwen Zhang.

J. Heat Transfer 140(4), 042205 (Jan 10, 2018) (7 pages) Paper No: HT-17-1246; doi: 10.1115/1.4038422 History: Received May 03, 2017; Revised September 10, 2017

Numerical study of nanofluid jet impingement cooling of a partially elastic isothermal hot surface was conducted with finite element method. The impingement surface was made partially elastic, and the effects of Reynolds number (between 25 and 200), solid particle volume fraction (between 0.01 and 0.04), elastic modulus of isothermal hot surface (between 104 and 106), size of the flexible part (between 7.5 w and 25 w), and nanoparticle type (spherical, cylindrical, blade) on the fluid flow and heat transfer characteristics were analyzed. It was observed that average Nusselt number enhances for higher Reynolds number, higher values of elastic modulus of flexible wall, smaller size of elastic part, and higher nanoparticle solid volume fraction and for cylindrical shaped particles. It is possible to change the maximum Nusselt number by 50.58% and 33% by changing the elastic modulus of the hot wall and size of elastic part whereas average Nusselt number changes by only 9.33% and 6.21%. The discrepancy between various particle shapes is higher for higher particle volume fraction.

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Figures

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Fig. 1

(a) Physical model with boundary conditions and (b) grid distribution

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Fig. 2

Influence of Reynolds number on the variation of streamlines and isotherms with cylindrical shaped particles (E = 5 × 104, d/w = 17.5, ϕ = 0.02), (a) Re = 25, (b) Re = 100, (c) Re = 200, (d) Re = 25, (e)Re = 100, and (f) Re = 200

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Fig. 3

Distribution of Nusselt numbers along the hot wall for various values of Reynolds number and two values of elastic modulus with cylindrical shaped particles (d/w = 17.5, ϕ = 0.02), (a) local Nu, E = 104, (b) local Nu, E = 106, and (c) average Nu

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Fig. 4

Variation of streamlines and isotherms for various elastic modulus of the flexible wall with cylindrical shaped particles (Re = 200, d/w = 17.5, ϕ = 0.02), (a) E = 104, (b) E = 5 × 104, (c) E = 105, (d) E = 106, (e) E = 104, (f) E = 5 × 104, (g) E = 105, and (h) E = 106

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Fig. 5

Distribution of local and average Nusselt number along the hot wall for various elastic modulus of flexible wall (Re = 200, d/w = 17.5, ϕ = 0.02, cylindrical shape)

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Fig. 6

Effects of size of the elastic part of the hot wall on the distribution of local and average Nusselt numbers (E = 5 × 104, ϕ = 0.02, cylindrical shape)

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Fig. 7

Effects of nanoparticle volume fraction and shape on the Nusselt number distribution along the hot elastic surface (Re = 200, E = 5 × 104)

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