超临界二氧化碳在水平微通道管内流动与传热特性的直接数值模拟OA
Direct numerical simulation of flow and heat transfer characteristics of supercritical CO2 in horizontal micro-channels
本研究采用直接数值模拟(DNS)方法,研究超临界二氧化碳(sCO2)在圆形微通道内的流动与传热特性.分析了热流密度、质量流量、管道直径和压力等因素对传热系数的影响,并讨论了浮升力效应与流动加速效应对换热性能的作用.研究结果表明,减小热流密度或增大质量流量可提升换热水平,降低二次流强度和温度梯度差,减小不可逆损失.为提高超临界CO2的换热能力,应减小管径、降低热流密度和压力,并提高质量流量,使其工作在拟临界温度附近.
This study employs direct numerical simulation(DNS)to investigate the flow and heat transfer characteristics of supercritical carbon dioxide(sCO2)in circular micro-channels.The effects of heat flux density,mass flow rate,pipe diameter,and pressure on the heat transfer coefficient are analyzed,and the roles of buoyancy and flow acceleration effects on heat transfer performance are discussed.The results show that reducing heat flux density or increasing mass flow rate can enhance overall heat transfer,decrease the intensity of secondary flows,reduce temperature gradient differences,and minimize irreversible losses.To improve the heat transfer capability of supercritical CO2,it is recommended to reduce pipe diameter,decrease heat flux density,lower pressure,and increase mass flow rate,while operating close to the pseudo-critical temperature.
张杰;范志伟;王强;肖刚;樊建人
浙江大学能源高效清洁利用全国重点实验室,浙江 杭州 310027浙江新劲空调设备有限公司,浙江 丽水 323700浙江大学能源高效清洁利用全国重点实验室,浙江 杭州 310027浙江大学能源高效清洁利用全国重点实验室,浙江 杭州 310027浙江大学能源高效清洁利用全国重点实验室,浙江 杭州 310027
能源科技
超临界二氧化碳数值模拟流动传热
supercritical carbon dioxidenumerical simulationflowheat transfer
《能源工程》 2026 (3)
26-31,6
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