Experimental investigation of secondary flow effect caused by internal heat generation in the horizontal laminar pipe flow

IF 6.9 2区 工程技术 Q2 ENERGY & FUELS
Dong-Hyuk Park, Bum-Jin Chung
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引用次数: 0

Abstract

In the Liquid-fueled Molten Salt Reactors (MSRs), the nuclear fuel is dissolved within the fluid, serving as the heat source and resulting in a non-homogeneous energy equation. Understanding the resulting thermal–hydraulic behavior is essential for the design and safety evaluation of MSRs. This study experimentally investigated laminar horizontal pipe flow with internal heat generation. Uniform volumetric heat generation was achieved by electrical dissipation of an H2SO4 electrolyte solution. By varying the Reynolds number and heat generation rate, circumferential and axial wall temperature distributions were measured. The presence of internal heat generation led to elevated wall temperatures, attributed to low fluid velocity near the wall. These temperature gradients induced buoyancy forces, resulting in thermal stagnation in the top region of the pipe and the development of secondary flow beneath this region. This phenomenon contributed to localized hot spots on the top region and wall temperature reduction at the lower region. Based on the experimental data, empirical correlations for the dimensionless wall temperature were developed. To the best of our knowledge, this study presents the first experimental observation of secondary flow effects in internally heated horizontal laminar pipe flow.
水平层流管内生热引起二次流效应的实验研究
在液体燃料熔盐反应堆(MSRs)中,核燃料溶解在流体中,作为热源,导致非均匀能量方程。了解由此产生的热液行为对msr的设计和安全评估至关重要。实验研究了带内部生热的层流水平管道流动。通过电耗散H2SO4电解质溶液实现了均匀的体积产热。通过改变雷诺数和热生成率,测量了周向和轴向壁面的温度分布。由于壁面附近流体速度较低,内部生热导致壁面温度升高。这些温度梯度引起浮力,导致管道顶部区域的热停滞和该区域下方二次流的发展。这一现象导致了顶部区域的局部热点和下部区域壁面温度的降低。基于实验数据,建立了无量纲壁面温度的经验关系式。据我们所知,本研究首次对内加热水平层流管内的二次流效应进行了实验观察。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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