Experimental study on the effect of wall roughness on heat transfer characteristics of supercritical carbon dioxide in vertical tubes
Experimental study on the effect of wall roughness on heat transfer characteristics of supercritical carbon dioxide in vertical tubes
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壁面粗糙度对超临界二氧化碳立管传热特性影响的实验研究
DOI：
10.1016/j.ijheatmasstransfer.2022.123258
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发表时间：
2022
影响因子：
5.2
通讯作者：
Wen-Long Cheng
中科院分区：
文献类型：
--
作者：
Jian Chen;Shuang-Gen Yang;Rui Zhao;Wen-Long Cheng
·实验研究了壁面粗糙度对S-CO2传热的影响。·粗糙的壁可以减轻传热恶化并增强传热。讨论了操作参数对S-CO2传热的影响。·基于实验数据提出了相关性，包括粗糙度效应。超临界CO2（S-CO2）的传热特性是S-CO2动力循环的关键。以往的研究主要集中在S-CO2在光滑管或肋管内的传热。粗糙壁面会影响湍流中的传热。而粗糙度对S-CO2传热的影响研究较少。对不同粗糙度（1.5 μm ~ 40 μm）的S-CO2管内（d = 4.57mm，Re ≤91735）的换热特性进行了实验研究。结果表明，粗糙壁面有利于减缓传热恶化，具体表现为：传热恶化的临界热负荷（q / G）随粗糙度的增大从0.11 kJ/kg增大到0.17 kJ/kg。在高q / G条件下，所有换热管的换热性能均恶化，随着粗糙度的增加，换热管的峰值温度和恶化长度分别从106.9 °C和0.75 m下降到73.7 °C和0.25 m。在低q / G下，各种管中的传热没有恶化，传热系数随着粗糙度的增加几乎增加两倍。操作参数对S-CO2在不同管内换热性能的影响是相似的。根据5460个实验数据，提出了粗糙管传热关联式，该关联式对90%的实验数据的拟合误差在±20%以内。
• The effect of wall roughness on S-CO 2 heat transfer was studied experimentally. • Rough walls can alleviate heat transfer deterioration and enhance heat transfer. • The effect of operation parameters on the heat transfer of S-CO 2 was discussed. • A correlation was proposed based on experimental data, including roughness effects. The heat transfer characteristics of supercritical carbon dioxide(S-CO 2 ) are vital for S-CO 2 power cycles. Previous studies primarily focused on the heat transfer of S-CO 2 in smooth or ribbed tubes. Rough walls can affect the heat transfer in turbulent flows. Whereas roughness effects on S-CO 2 heat transfer have rarely been studied. The heat transfer characteristics of S-CO 2 in tubes ( d =4.57 mm,16207≤ Re ≤91735) with various roughness (1.5 μm∼40 μm) are investigated experimentally in this study. The results reveal that rough wall helps alleviate heat transfer deterioration, which is embodied in: the critical heat load( q / G ) for heat transfer deterioration increases from 0.11 kJ/kg to 0.17 kJ/kg as roughness increases. Heat transfer deteriorates in all tubes under high q / G , the temperature peak and deterioration length drop from 106.9 °C to 73.7 °C and 0.75 m to 0.25 m as roughness increases. No heat transfer deterioration in various tubes under low q / G , the heat transfer coefficient practically triples with increasing roughness. The effect of operation parameters on heat transfer performance of S-CO 2 in various tubes is similar. A heat transfer correlation for rough tubes is proposed based on 5460 experimental data, which catches 90% of experimental data within ±20% error.
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