Comprehensive Review of Heat Transfer Correlations of Supercritical CO2 in Straight Tubes Near the Critical Point: A Historical Perspective

Abstract An exhaustive review was undertaken to assemble all available correlations for supercritical CO2 in straight, round tubes of any orientation, with special attention paid how the wildly varying fluid properties near critical point are handled. The assemblage correlations, along subsequent discussion, is presented from a historical perspective, starting pioneering work on topic 1950s modern day. Despite growing sophistication sCO2 heat transfer still only generally applicable over relatively small range operating conditions, and there has not been substantial increase predictive capabilities. Recently, researchers have turned machine learning as tool next-generation prediction. overview state-of-the-art predicting using methods, such artificial neural networks, also presented.