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Research Papers: Natural and Mixed Convection

Natural Convection Heat Transfer Enhancement in a Differentially Heated Parallelogrammic Enclosure Filled With Copper-Water Nanofluid

[+] Author and Article Information
Salam Hadi Hussain

Mechanical Engineering Department,
College of Engineering,
Babylon University,
Babylon Province 00964, Iraq
e-mail: salamphd1974@yahoo.com

Ahmed Kadhim Hussein

Mechanical Engineering Department,
College of Engineering,
Babylon University,
Babylon Province, Iraq
e-mail: ahmedkadhim7474@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 21, 2012; final manuscript received April 12, 2014; published online May 9, 2014. Assoc. Editor: William P. Klinzing.

J. Heat Transfer 136(8), 082502 (May 09, 2014) (8 pages) Paper No: HT-12-1622; doi: 10.1115/1.4027448 History: Received November 21, 2012; Revised April 12, 2014

Laminar natural convection of a nanofluid consists of water and copper in a differentially heated parallelogrammic enclosure has been studied numerically using the finite volume method (FVM). Governing equations are solved over a wide range of Rayleigh numbers (104≤ Ra ≤ 106), skew angles (−60 deg ≤ Φ ≤ +60 deg), aspect ratios (0.5 ≤ AR ≤ 4), and solid volume fractions (0 ≤ φ ≤ 0.2). Effects of all these parameters on flow and thermal fields are presented in form of streamline, isotherm contours and average Nusselt number. It is shown that the heat transfer rate increases remarkably by the addition of copper-water nanofluid and the shape of the convection vortices is sensitive to the skew angle variation.

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Figures

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Fig. 1

Schematic diagram and coordinate system of the physical domain with boundary conditions

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Fig. 2

Variation of streamlines for different solid void fractions (φ) and skew angles (Φ) at Ra = 104

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Fig. 3

Variation of isotherms for different solid void fractions (φ) and skew angles (Φ) at Ra = 104

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Fig. 4

Variation of streamlines for different solid void fractions (φ) and skew angles (Φ) at Ra = 106

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Fig. 5

Variation of isotherms for different solid void fractions (φ) and skew angles (Φ) at Ra = 106

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Fig. 6

Variation of streamlines for various ARs and skew angles (Φ) at Ra = 105, φ = 0, 0.1 with pure fluid (dashed lines ― ―) and nanofluid (solid lines —)

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Fig. 7

Variation of isotherms for various ARs and skew angles (Φ) at Ra = 105, φ = 0, 0.1 with pure fluid (dashed lines ― ―) and nanofluid (solid lines —)

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Fig. 8

Variation of average Nusselt numbers with skew angles for φ = 0, 0.1 Ra = 104 & 106 and AR = 1

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Fig. 9

Variation of the average Nusselt number with aspect ratio for various skew angles at Ra = 105 and φ = 0, 0.1

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