Direct numerical simulation of strongly heated air flow in vertical pipe using a thermophyscial property table

• 摘要：

  The supercritical water-cooled reactor has attracted plentiful attention due to its high thermal efficiency. Fundamental research is important to provide the benchmark data and understand the mechanism of flow and heat transfer at the supercritical condition. In present work, a direct numerical simulation code using thermophysical property table was developed to study the characteristics of flow and heat transfer in strongly heated air flow and further in the supercritical water flow. The experiment of air flow with large density variation due to strongly heating conducted by Shehata and McEligot (1995) was used to validate our code. The mean velocity and wall temperature distributions are in good agreement with the experimental data. In addition, the wall temperature and local Nusselt number are also shown an exact agreement. The turbulent statistics, like mean shear stress, Reynolds shear stress, turbulent heat flux, turbulent kinetic energy and buoyancy production terms, are analyzed and compared with the previous DNS data. The flow relaminarization is observed by showing its instantaneous contour of velocity. Based on these validations, our present DNS code is well capable of calculating the turbulence heat transfer and flow with strongly property variation and will be used for simulation of supercritical water in the next step.

• 作者：

  Jiaming Liu;Zhihao Ge;Nian Zhao;Yuanjie Li;平辉 赵;元熙 万

• 刊名：

• 在线出版时间：

  2017