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<p>The characteristics of the boundary layer in supercritical water (SCW) gasification reactors include large temperature differences and drastic changes in physical properties. In this paper, the application of the asymptotic theoretical method of the variable properties boundary layer in such an SCW boundary layer is first studied. Neither the 1st- nor 2nd-order formulas of this method can successfully predict the change trend of the surface friction coefficient (<i>C</i><sub>f</sub>) with the temperature boundary conditions in the SCW plate boundary layer. The reason is that the property–temperature dependence relationships constructed via this method are not applicable to the SCW flow field. The original method is subsequently improved by constructing a series of simplified property–temperature relationships suitable for SCW. By embedding the simplified properties model into the dimensionless boundary layer equation and solving it numerically, the <i>C</i><sub>f</sub> calculation formula based on the simplified properties embedded (SPE) method can be obtained. The results of <i>C</i><sub>f</sub> obtained via the SPE method are highly accurate, and the relative error between these results and the direct numerical simulation (DNS) results does not exceed 0.899%. Moreover, the SPE method also successfully predicts the special change trend caused by drastic property changes near the pseudocritical temperature, which compensates for the limitations of the original asymptotic method in the SCW flow field.</p>

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A method to investigate the variable physical properties of the boundary layer for the supercritical water flat plate model

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Peitong Li,
  • Xiaoyu Li,
  • Bowen Ke,
  • Hui Jin

摘要

The characteristics of the boundary layer in supercritical water (SCW) gasification reactors include large temperature differences and drastic changes in physical properties. In this paper, the application of the asymptotic theoretical method of the variable properties boundary layer in such an SCW boundary layer is first studied. Neither the 1st- nor 2nd-order formulas of this method can successfully predict the change trend of the surface friction coefficient (Cf) with the temperature boundary conditions in the SCW plate boundary layer. The reason is that the property–temperature dependence relationships constructed via this method are not applicable to the SCW flow field. The original method is subsequently improved by constructing a series of simplified property–temperature relationships suitable for SCW. By embedding the simplified properties model into the dimensionless boundary layer equation and solving it numerically, the Cf calculation formula based on the simplified properties embedded (SPE) method can be obtained. The results of Cf obtained via the SPE method are highly accurate, and the relative error between these results and the direct numerical simulation (DNS) results does not exceed 0.899%. Moreover, the SPE method also successfully predicts the special change trend caused by drastic property changes near the pseudocritical temperature, which compensates for the limitations of the original asymptotic method in the SCW flow field.