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Heat transfer from a 2 × 2 wire-wrapped rod bundle to supercritical pressure water

机译:从2×2线绕棒束到超临界压力水的热传递

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摘要

An experiment has been completed to study the heat transfer characteristics of supercritical water in a 2×2 wire-wrapped rod bundle. The rod-bundle simulated a fuel assembly with four heated rods and was installed inside a square channel with rounded corners. A wire of 1.2 mm outer diameter was helically wrapped around the outer surface of each heated rod at an axial pitch of 200 mm. The experimental parameters covered the pressure of 23-28 MPa, mass flux of 400-1000 kg/m~2s and heat flux range on the rod surface of 200-1000 kW/m~2. Wall temperatures obtained at each heated rod were examined and average heat transfer coefficients were calculated at each measuring location of the rod and compared against those obtained with a 2 × 2 bare rod bundle. Heat transfer characteristics of supercritical water in the 2 × 2 rod bundle were analyzed with respect to the variations of heat flux, mass flux and pressure. Eleven heat transfer correlations were assessed against the current set of test data. The results showed that the correlations of Jackson and Krasnoshchekov-Protopopov give the best predictions on average Nusselt number.
机译:已经完成了研究超临界水在2×2绕线棒束中的传热特性的实验。棒束模拟了带有四个加热棒的燃料组件,并安装在带有圆角的方形通道内。将外径为1.2mm的金属丝以200mm的轴向螺距螺旋地缠绕在每个加热棒的外表面上。实验参数涵盖了23-28 MPa的压力,400-1000 kg / m〜2s的质量通量和200-1000 kW / m〜2的杆表面热通量范围。检查在每个加热棒上获得的壁温,并在棒的每个测量位置计算平均传热系数,并将其与用2×2裸棒束获得的传热系数进行比较。根据热通量,质量通量和压力的变化,分析了2×2棒束中超临界水的传热特性。根据当前的测试数据评估了11个传热相关性。结果表明,Jackson和Krasnoshchekov-Protopopov的相关性对平均Nusselt数给出了最佳预测。

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