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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

Variation of the nondimensional system overall temperature difference with slenderness for cylinder--cylinder building block (analytical result, ϕ = 0.05 and  = 641.6667).
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Figure 2: Variation of the nondimensional system overall temperature difference with slenderness for cylinder--cylinder building block (analytical result, ϕ = 0.05 and = 641.6667).

Mentions: which indicates that the building block's overall temperature difference (or thermal resistance) depends on its slenderness under the same composing materials, composition ratio, volumetric heat generation rate, and total volume. Figure 2 typifies this dependence at ϕ = 0.05 and = 641.6667 (thermal conductivity ratio of copper and water). By minimizing this nondimensional system overall temperature difference with respect to , the nondimensional constructal system overall temperature difference can be obtained:(11)


Constructal blade shape in nanofluids.

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

Variation of the nondimensional system overall temperature difference with slenderness for cylinder--cylinder building block (analytical result, ϕ = 0.05 and  = 641.6667).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Variation of the nondimensional system overall temperature difference with slenderness for cylinder--cylinder building block (analytical result, ϕ = 0.05 and = 641.6667).
Mentions: which indicates that the building block's overall temperature difference (or thermal resistance) depends on its slenderness under the same composing materials, composition ratio, volumetric heat generation rate, and total volume. Figure 2 typifies this dependence at ϕ = 0.05 and = 641.6667 (thermal conductivity ratio of copper and water). By minimizing this nondimensional system overall temperature difference with respect to , the nondimensional constructal system overall temperature difference can be obtained:(11)

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