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.
Highlights
Nanofluids are mixtures of nanoparticles and base fluids, which have different thermal conductivities [1-5]
It should be noted that conventional heat transfer fluids have normally very low thermal conductivity, destroying much exergy during heat transport
Our previous studies have proved that the blade configuration of nanofluids is much better than the dispersed configuration for the two kinds of disk-shaped heat conduction systems with different boundary conditions [20,21]
Summary
Nanofluids are mixtures of nanoparticles and base fluids, which have different thermal conductivities [1-5]. Under the same composing materials (k = 641.6667), composition ratio (j = 0.05), volumetric heat generation rate and total volume, the cylinder–triangular-prism and rectangular-prism–triangular-prism building blocks with slenderness values of 0.25 and 0.3, respectively, should be used for achieving the lowest system overall temperature difference (or, system thermal resistance) in practical applications. Both the pursuits of energy and material savings make this aim very significant. The constructal cylinder–shaped heat conduction building block performs better than the rectangular-prism–shaped building block
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