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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of heat transfer on the instabilities and transitions of supercritical CO_2 flow in a natural circulation loop
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Effect of heat transfer on the instabilities and transitions of supercritical CO_2 flow in a natural circulation loop

机译：传热对自然循环回路中超临界CO_2流动的不稳定性和跃迁的影响

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摘要

System stabilities are of critical importance in natural circulation applications. Investigations show that for supercritical CO_2 flow new behaviors can be seen in natural convection systems considering its temperature-sensitive physical properties. In the present study, numerical simulations on a supercritical CO_2 natural circulation loop have been carried out to investigate the flow transitions and instabilities of such systems. In the present model heat sink temperature is kept at 298 K while heat source temperature varies in the range of 310-1023 K as a controlling parameter. It is found for the first time that for the present supercritical CO_2 model there exists a transition heat source temperature at which the system changes from unstable repetitive-reversal flow into stable one-direction flow with the increase of temperature, which is fundamentally different from previous studies for normal fluid. In particular, the critical transition fluid temperature is found to be near the second "pseudo-critical temperature" at around 375 K where the fluid properties experience major transitions with the increase of temperature. In addition, characteristics of flow stability behaviors are also analyzed in detail.
机译：系统稳定性在自然循环应用中至关重要。研究表明，对于超临界CO_2流动，考虑到其对温度敏感的物理特性，可以在自然对流系统中看到新的行为。在本研究中，已对超临界CO_2自然循环回路进行了数值模拟，以研究此类系统的流动过渡和不稳定性。在本模型中，散热器温度保持在298 K，而热源温度在310-1023 K的范围内变化作为控制参数。首次发现，对于当前的超临界CO_2模型，存在一个过渡热源温度，在该温度下，系统随着温度的升高而从不稳定的反复逆流变为稳定的单向流，这与以前的方法根本不同。研究正常体液。特别地，发现临界转变流体温度在约375K处接近第二“伪临界温度”，其中流体性质随着温度的升高经历主要转变。此外，还详细分析了流动稳定性行为的特征。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第20期|P.4101-4111|共11页
  • 作者

    Lin Chen; Xin-Rong Zhang; Hiroshi Yamaguchi; Zhong-Sheng (Simon) Liu;

  • 作者单位

    Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China;

    rnDepartment of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China Energy Conversion Research Center, Department of Mechanical Engineering, Doshisha University, Kyo-Tanabeshi, Kyoto 610-0321, Japan;

    rnEnergy Conversion Research Center, Department of Mechanical Engineering, Doshisha University, Kyo-Tanabeshi, Kyoto 610-0321, Japan;

    rnInstitute for Fuel Cell Innovation, National Research Council Canada, 4250 Wesbrook Mall, Vancouver, BC, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    supercritical CO_2; natural convection; heat transfer; instability; flow transition;

    机译：超临界CO_2;自然对流;传播热量;不稳定流动过渡;

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