材料科学
传热系数
过冷
传热
热力学
热交换器
冷凝
表面粗糙度
NTU法
临界热流密度
表面光洁度
复合材料
物理
作者
Ingrid Snustad,Åsmund Ervik,Anders Austegard,Amy L. Brunsvold,Jianying He,Zhiliang Zhang
标识
DOI:10.1016/j.expthermflusci.2021.110440
摘要
Understanding condensation of CO2 is essential for e.g designing compact heat exchangers or processes involved in Carbon Capture and Storage. However, a consistent experimental campaign for condensation of CO2 on common materials is lacking. In this work, we present an experimental method and an associated laboratory setup for measuring the heat transfer properties of CO2 condensation on materials commonly used in heat exchangers for the liquefaction of CO2. We have investigated the heat transfer during CO2 condensation on copper, aluminum, stainless steel (316) to reveal the heat transfer dependency on surface properties. The experiments are conducted at three saturation pressures, 10, 15, and 20 bar and at substrate subcooling between 0 and 5k. The results show that the heat transfer coefficients decrease with increasing surface subcooling. It was also found that increasing the saturation pressure increases the heat transfer coefficient. The results indicate that surface roughness and surface energy affect the condensation heat transfer coefficient, and an increased roughness results in reduced heat transfer coefficients. The highest heat transfer coefficient is found for condensation on copper, for which the lowest surface roughness has been measured.
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