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Numerical investigation on flow and heat transfer of supercritical CO2 in variable cross-section tubes under precooler working conditions by Qing Li; Ming-Hui Zhang; Yi-Liang Ouyang; Zhe-Xi Wen is a Engineering article available to read on EtoBox.

What is Numerical investigation on flow and heat transfer of supercritical CO2 in variable cross-section tubes under precooler working conditions about?

The performance of the precooler in the supercritical CO 2 (S-CO 2 ) Brayton cycle may be greatly affected by the interactions between the structure and the thermophysical properties. Variable cross-section tubes, which can effectively enhance heat transfer and reduce pressure drop, can be adopted in the precooler. In this paper, the flow and heat transfer performance of S-CO 2 in a circular tube and variable cross-section tubes with different unit length divergent ratio (DR) and convergent ratio (CR) is firstly investigated when the heat transfer area is kept constant. The results show that the converging tubes can effectively enhance the heat transfer compared with the circular tube, and a greater CR is more beneficial for heat transfer. The heat transfer coefficient (h total ) is increased by 84.77% at the maximum. The diverging tubes are found to have a strong advantage in reducing the pressure drop, and a larger DR is more helpful to reduce pressure drop, with a maximum decrease of 84.4%. The heat transfer mechanism is analyzed from the aspects of flow field distribution, thermophysical property changes and buoyancy effect. Furthermore, combined with the performance of differe

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Author

Qing Li; Ming-Hui Zhang; Yi-Liang Ouyang; Zhe-Xi Wen

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)