How does suspended particles (dust) in air affect the natural convection heat transfer coefficient?
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Suspended particles (dust) in air have been found to affect the natural convection heat transfer coefficient. In one study, it was observed that high-conductivity suspended particles can enhance heat transfer up to 2.5 times, while low-conductivity particles promote a lower heat transfer enhancement . Another study showed that the presence of nanoparticles in a lid-driven cavity filled with nanofluids can enhance convection heat transfer, with the enhancement being directly connected to the nanoparticles concentration . Additionally, the shape of the solid frustum suspended in air was found to affect heat transfer, with the inverted frustum losing more heat compared to the straight frustum . These findings suggest that suspended particles, depending on their conductivity and concentration, can significantly impact natural convection heat transfer.
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