Bifurcation phenomenon for forced convection of supercritical CO2 sudden expansion flow and heat transfer in symmetric regime

Bifurcation phenomenon for forced convection of supercritical CO2 sudden expansion flow and heat transfer in symmetric regime
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超临界CO2突然膨胀流强制对流分叉现象及对称区传热

DOI:
10.1016/j.ijheatmasstransfer.2010.06.047
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发表时间:
2010-10
影响因子:
5.2
通讯作者:
--
中科院分区:
工程技术2区
文献类型:
--
作者:

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本文对具有平面对称突扩的水平管内超临界CO2流动的层流强迫对流及其分叉现象进行了计算研究。在不同雷诺数的情况下,对不同壁面热流密度进行了计算。引入了一个称为环流扰动强度的参数,旨在揭示雷诺数或壁面热流密度增大时流动稳定性的降低。给出了对称流区的Nusselt数分布,讨论了峰值Nusselt数及其相对位置的变化。给出了壁面摩擦系数和压力系数的分布,并进行了讨论。
A computational investigation of laminar forced convection of supercritical CO2flow in horizontal duct with plane symmetric sudden expansion and its bifurcation phenomenon are presented in this study. The computations were conducted at various Reynolds numbers for cases of different wall heat fluxes. A parameter named recirculation disturbance intensity is introduced that is aimed to shed some light on the reduction of flow stability when Reynolds number or wall heat flux increases. The Nusselt number distribution in the symmetric flow regime is presented, the variations of peak Nusselt number and its relative location are discussed. Wall friction coefficient and pressure coefficient distributions are presented and discussed.
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