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Constructal blade shape in nanofluids.

Bai C, Wang L - Nanoscale Res Lett (2011)

Bottom Line: The regular-triangular-prism--shaped blade has been proven to perform better than all the other three kinds of blades, namely, the regular-rectangular-prism--shaped blade, the regular-hexagonal-prism--shaped blade, and the cylinder--shaped blade.Thus, the regular-triangular-prism--shaped blade is selected as the optimally shaped blade for the two kinds of building blocks that are considered in this study.It is also proven that the constructal cylinder--regular-triangular-prism building block performs better than the constructal regular-rectangular-prism--regular-triangular-prism building block.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong. lqwang@hku.hk.

ABSTRACT
Blade configuration of nanofluids has been proven to perform much better than dispersed configuration for some heat conduction systems. The analytical analysis and numerical calculation are made for the cylinder--shaped and regular-rectangular-prism--shaped building blocks of the blade-configured heat conduction systems (using nanofluids as the heat conduction media) to find the optimal cross-sectional shape for the nanoparticle blade under the same composing materials, composition ratio, volumetric heat generation rate, and total building block volume. The regular-triangular-prism--shaped blade has been proven to perform better than all the other three kinds of blades, namely, the regular-rectangular-prism--shaped blade, the regular-hexagonal-prism--shaped blade, and the cylinder--shaped blade. Thus, the regular-triangular-prism--shaped blade is selected as the optimally shaped blade for the two kinds of building blocks that are considered in this study. It is also proven that the constructal cylinder--regular-triangular-prism building block performs better than the constructal regular-rectangular-prism--regular-triangular-prism building block.

No MeSH data available.


Related in: MedlinePlus

Two kinds of heat conduction building blocks considered in this study: (a) cylinder--cylinder building block; (b) rectangular-prism--cylinder building block.
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Figure 1: Two kinds of heat conduction building blocks considered in this study: (a) cylinder--cylinder building block; (b) rectangular-prism--cylinder building block.

Mentions: The cylinder--shaped and regular-rectangular-prism--shaped building blocks are studied in this article. The nanoparticle blade has four different shapes: regular triangular prism, regular rectangular prism, regular hexagonal prism, and cylinder. For conciseness, the word "regular" is omitted hereafter. A format of "building-block-shape--blade-shape" is used to indicate the eight kinds of building blocks. Figure 1 shows the two kinds of building blocks with cylinder blades. For all the eight kinds of building blocks, uniform heat generation rate occurs in the base fluid region. All the external surfaces, except the cross-sectional plane x = 0 of the blade, are adiabatic. The cross-sectional plane x = 0 of the blade serves as the heat sink with constant temperature. The composition of these two-material building blocks is fixed by volume fraction(1)


Constructal blade shape in nanofluids.

Bai C, Wang L - Nanoscale Res Lett (2011)

Two kinds of heat conduction building blocks considered in this study: (a) cylinder--cylinder building block; (b) rectangular-prism--cylinder building block.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211301&req=5

Figure 1: Two kinds of heat conduction building blocks considered in this study: (a) cylinder--cylinder building block; (b) rectangular-prism--cylinder building block.
Mentions: The cylinder--shaped and regular-rectangular-prism--shaped building blocks are studied in this article. The nanoparticle blade has four different shapes: regular triangular prism, regular rectangular prism, regular hexagonal prism, and cylinder. For conciseness, the word "regular" is omitted hereafter. A format of "building-block-shape--blade-shape" is used to indicate the eight kinds of building blocks. Figure 1 shows the two kinds of building blocks with cylinder blades. For all the eight kinds of building blocks, uniform heat generation rate occurs in the base fluid region. All the external surfaces, except the cross-sectional plane x = 0 of the blade, are adiabatic. The cross-sectional plane x = 0 of the blade serves as the heat sink with constant temperature. The composition of these two-material building blocks is fixed by volume fraction(1)

Bottom Line: The regular-triangular-prism--shaped blade has been proven to perform better than all the other three kinds of blades, namely, the regular-rectangular-prism--shaped blade, the regular-hexagonal-prism--shaped blade, and the cylinder--shaped blade.Thus, the regular-triangular-prism--shaped blade is selected as the optimally shaped blade for the two kinds of building blocks that are considered in this study.It is also proven that the constructal cylinder--regular-triangular-prism building block performs better than the constructal regular-rectangular-prism--regular-triangular-prism building block.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong. lqwang@hku.hk.

ABSTRACT
Blade configuration of nanofluids has been proven to perform much better than dispersed configuration for some heat conduction systems. The analytical analysis and numerical calculation are made for the cylinder--shaped and regular-rectangular-prism--shaped building blocks of the blade-configured heat conduction systems (using nanofluids as the heat conduction media) to find the optimal cross-sectional shape for the nanoparticle blade under the same composing materials, composition ratio, volumetric heat generation rate, and total building block volume. The regular-triangular-prism--shaped blade has been proven to perform better than all the other three kinds of blades, namely, the regular-rectangular-prism--shaped blade, the regular-hexagonal-prism--shaped blade, and the cylinder--shaped blade. Thus, the regular-triangular-prism--shaped blade is selected as the optimally shaped blade for the two kinds of building blocks that are considered in this study. It is also proven that the constructal cylinder--regular-triangular-prism building block performs better than the constructal regular-rectangular-prism--regular-triangular-prism building block.

No MeSH data available.


Related in: MedlinePlus