﻿ 冷却条件下超临界CO<sub>2</sub>在突扩管中流动及其换热的数值模拟

# 冷却条件下超临界CO2在突扩管中流动及其换热的数值模拟Numerical Simulation on the Flow and Heat Transfer of Supercritical CO2 in Sudden Expansion Pipe under Cooling Condition

Abstract: The flow and heat transfer law of supercritical CO2 in sudden expansion duct has important meaning on efficient design of technology and devices of new energy conversion system and recycling of waste resources. In this paper, the numerical method is finite volume method. The flow and heat transfer law of supercritical CO2 in sudden expansion duct under cooling condition is studied in this paper by using numerical method of finite volume method. It is founded that the flow situation of supercritical CO2 in sudden expansion pipe under cool condition is the same as that of under heat condition in this study. Compared with the condition of heating, the bifurcation phenomenon is easier to appear under cooling. And with the increase of wall cooling heat flux, the length of recirculation regions becomes smaller. It is a comparison and supplement to the previous studies, and sheds some light on the application of the law of flow and heat transfer of supercritical CO2 as working fluid material in sudden expansion duct.

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