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首页> 外文期刊>International Journal of Refrigeration >Effect of CuO nanolubricant on R134a pool boiling heat transfer
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Effect of CuO nanolubricant on R134a pool boiling heat transfer

机译：CuO纳米润滑剂对R134a池沸腾传热的影响

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摘要

This paper quantifies the influence of CuO nanoparticles on the boiling performance of R134a/polyolester mixtures on a roughened, horizontal, flat surface. A lubricant based nanofluid (nanolubricant) was made with a synthetic ester and CuO particles. For the 0.5% nanolubricant mass fraction, the nanoparticles caused a heat transfer enhancement relative to the heat transfer of pure R134a/polyolester (99.5/0.5) of between 50% and 275%. A smaller enhancement was observed for the R134aanolubricant (99/1) mixture, which had a heat flux that was on average 19% larger than that of the R134a/polyolester (99/1) mixture. Further increase in the nanolubricant mass fraction to 2% resulted in a still smaller boiling heat transfer improvement of approximately 12% on average. Thermal conductivity measurements and a refrigerant/lubricant mixture pool-boiling model were used to suggest that increased thermal conductivity is responsible for only a small portion of the heat transfer enhancement due to nanoparticles.
机译：本文定量了在粗糙，水平，平坦的表面上，CuO纳米颗粒对R134a /多酯混合物的沸腾性能的影响。基于润滑剂的纳米流体（纳米润滑剂）由合成酯和CuO颗粒制成。对于0.5％的纳米润滑剂质量分数，相对于纯R134a /多酯（99.5 / 0.5）的热传递，纳米颗粒引起了50％至275％之间的热传递增强。观察到R134a /纳米润滑剂（99/1）混合物的增强较小，其热通量平均比R134a /聚烯烃（99/1）混合物大19％。纳米润滑剂质量分数的进一步增加至2％导致沸腾传热的改善仍较小，平均约12％。热导率测量和制冷剂/润滑剂混合物的沸腾模型用于表明，由于纳米颗粒的存在，增加的热导率仅占热传递增强的一小部分。

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