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Investigation into the efficiency of a fin and wound wire intensifier

机译：翅片和绕线增强器效率的研究

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The work continues the experimental investigations into heat transfer enhancement carried out at NIU MPEI. To verify the obtained results and extend the range of geometric characteristics of the intensifier, additional systematic experiments were performed. The investigations were carried out under the program of improvement of existing water-cooled water-moderated reactors to create a base of reliable experimental data and design correlations that could be required in developing reactors of the fourth generation. Among the methods for improving the safety of the core and of the overall reactor is the replacement of conventional fuel rods in fuel assemblies with tubular ones and development of spacers that best suit fuel assemblies. A design of an intensifier that can be used in a spacer grid is examined. A brief description of the test section and the design of developed intensifiers with a list of their basic geometric characteristics are presented. New systematic experimental data are given on hydraulic resistance factors and heat transfer coefficients for single-phase convection with the use of a fin-and-wound wire intensifier. This investigation extends the range of intensifier geometric characteristics and operating conditions: the mass flow rate range was ρw = 1000-4000 kg/(m~2 s), the pressure range was p = 3.0-7.0 MPa, the coolant temperature at the test section inlet was 100°C, and the heat flux range was q = 0.23-0.70 MW/m~2. The experiments revealed a considerable increase in the heat transfer coefficient on the convex heated surface and dependence of the hydraulic resistance factors and the heat transfer coefficients on the wire winding pitch. The relative pin heights offering a higher increase in heat transfer as compared with an increase in hydraulic resistance were established. Empirical correlations for predicting the heat transfer coefficients and the hydraulic resistance factors as a function of the intensifier geometric characteristics are proposed.
机译：这项工作将继续在NIU MPEI进行增强传热的实验研究。为了验证所获得的结果并扩展增强器的几何特性范围，还进行了其他系统的实验。在改进现有水冷水慢化反应堆的计划下进行了研究，以建立可靠的实验数据和设计相关性的基础，这可能是开发第四代反应堆所必需的。在提高堆芯和整个反应堆安全性的方法中，有一种方法是用管状燃料棒代替燃料组件中的常规燃料棒，并开发最适合燃料组件的垫片。研究了可用于间隔栅的增强器的设计。介绍了测试部分的简要说明和已开发的增压器设计，并列出了其基本几何特征。使用翅片绕线式增压器，给出了单相对流的水力阻力系数和传热系数的新系统实验数据。该研究扩展了增压器几何特性和工作条件的范围：质量流量范围为ρw= 1000-4000 kg /（m〜2 s），压力范围为p = 3.0-7.0 MPa，冷却液温度在测试中截面入口为100°C，热通量范围为q = 0.23-0.70 MW / m〜2。实验表明，在凸形加热面上的传热系数显着增加，并且水力阻力系数和传热系数与绕线螺距有关。建立了相对的销高度，与液压阻力的增加相比，销的相对高度增加了热传递。提出了经验的相互关系，用于预测传热系数和水力阻力系数，作为增压器几何特性的函数。

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