Study on the friction resistance characteristics of supercritical CO2 correlating with heat transfer behavior in vertical tubes

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-04-08 DOI:10.1016/j.ijheatmasstransfer.2025.127057

Wenhua Wu , Chenshuai Yan , Xinyi Zhang , Xiaojuan Niu , Haisong Zhang

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引用次数: 0

Abstract

The supercritical carbon dioxide (scCO₂) Brayton cycle has attracted significant attention because of high cycle efficiency and compact layout. As one of the critical issues, the characteristic of scCO₂ flow resistance, which affects compression work and thermal efficiency, is essential to the design of the cycle components. Firstly, the heat transfer and pressure drop characteristics of scCO₂ flowing vertically upwards in the heated tubes are experimentally and numerically investigated. The experimental parameters span pressures of 7.5−16 MPa, mass fluxes of 500−1530 kg/m²s, and heat fluxes of 20−250 kW/m². Then, the relationship between friction pressure drop and supercritical heat transfer behavior is numerically explored. We discover that both the friction pressure drop and friction factor are closely related to the supercritical heat transfer behavior. Exactly, supercritical heat transfer deterioration (HTD) can lead to a large friction pressure drop. We analyze the mechanism of heat transfer inducing friction pressure drop change according to the assumption of supercritical pseudo-phase change, where similar to the film boiling heat transfer at subcritical pressure, a vapor-like layer attaching to heating surface and core liquid-like phase. Owing to the large thermal resistance induced by the vapor-like layer when HTD occurs, the core liquid-like cannot be heated smoothly. That results in a high molecular viscosity level. Ulteriorly, the friction pressure drop rises. Considering the correlation between frictional pressure drop and scCO₂ heat transfer behavior, a newly modified Filonenko correlation is proposed to predict the friction factor of scCO₂. In contrast to the experimental data, the e_ME, e_MAE and e_RMSE of the new correlation are 3.6%, 16.41%, and 19.88%, respectively, which shows the highest prediction accuracy compared with the friction factor correlations in previous literature.

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垂直管内超临界CO2摩擦阻力特性与换热行为的关系研究

超临界二氧化碳（scCO2）布雷顿循环因其循环效率高、结构紧凑而受到广泛关注。scCO2流阻特性是影响压缩功和热效率的关键问题之一，对循环部件的设计至关重要。首先，对scCO2在加热管内垂直向上流动的传热和压降特性进行了实验和数值研究。实验参数范围为压力7.5 ~ 16 MPa，质量通量500 ~ 1530 kg/m2，热流通量20 ~ 250kw /m2。然后，对摩擦压降与超临界换热行为的关系进行了数值研究。研究发现，摩擦压降和摩擦因数与超临界传热行为密切相关。恰恰相反，超临界传热恶化（HTD）会导致较大的摩擦压降。根据超临界伪相变的假设，分析了传热引起摩擦压降变化的机理，其中类似于亚临界压力下的膜沸腾传热，加热表面附着一层气相，核心为液相。由于HTD发生时类蒸汽层产生较大的热阻，使得类液体的岩心无法顺利加热。这导致了高分子粘度水平。最终，摩擦压降升高。考虑摩擦压降与scCO2换热行为之间的相关性，提出了一种新的修正Filonenko关联来预测scCO2的摩擦因数。与实验数据相比，新相关系数的eME、eMAE和eRMSE分别为3.6%、16.41%和19.88%，与以往文献的摩擦因子相关系数相比，预测精度最高。

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来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer