Numerical Study Effect of Aspect Ratio on Flow and Conjugate Natural Convection in 2D Enclosure Filled with Nanofluid, Containing a Rectangular Heat Source

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Research areas:
Year:
2015
Type of Publication:
Article
Keywords:
Aspect Ratio, Nanofluid, Conjugate Natural Convection, Enclosure, Rectangle Heat Source
Authors:
Meysam Mahmoudi; Alireza Hossein Nezhad
Journal:
IJAIM
Volume:
3
Number:
4
Pages:
183-188
Month:
Jan.-Feb.
ISSN:
2320-5121
Abstract:
This paper numerically studies the effect of aspect ratio on current and heat transfer of nanofluid movement together with wall direction in a 2D enclosure filled with water-copper nanofluid with a rectangle fixed flow heat source. The study was conducted for three aspect ratios including AR=1, AR=1.5, and AR=2. Results showed that increasing aspect ratio in a fixed volume fraction increases temperature values. Moreover, increased aspect ratio decreased input heat value of the whole heat source to the enclosure. As a result, Nusselt numbers also decreased along enclosures’ warm and cold walls. Furthermore, to keep the enclosure cool, enclosure dimensions are suited with source fixed thermal flow to release higher heat from cool surface. Increased aspect ratio reduces nanofluid rate inside the enclosure, too. Studying flow lines represented that reduced rate in the enclosure and increased distance of warm wall from cool wall of clockwise vortex enhances by increasing aspect ratio in both halves intending to form a new vortex.

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