Experimental study on the characteristics of annular fluid film in a locally deformed narrow rectangular channel

IF 3.2 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2025-08-27 DOI:10.1016/j.pnucene.2025.106000

Fenze Wang , Quanyao Ren , Haidong Liu , Yi Xiao , Hongxing Yu , Deqi Chen

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Abstract

The local deformation of plate fuel assembly due to neutron irradiation will lead to the deterioration of heat transfer in the flow channel. Studying the characteristics of annular flow films in narrow rectangular channels under localized deformation provides a foundation for understanding the heat and mass transfer and the hydrodynamic characteristics of the locally deformed narrow flow channel. In this study, the annular flow liquid film characterization experiments were conducted in a narrow rectangular channel under three conditions: no local deformation, ellipsoidal deformation, and pillow-shaped deformation. Various parameters of the annular flow liquid films, including liquid film thickness, disturbance wave height, and disturbance wave wavelength, were obtained using a high-speed camera acquisition system and advanced image processing techniques. The effects of flow conditions and local deformation on the liquid film parameters of each annular flow were analyzed. As the radial size of the local deformation increases relative to the liquid film thickness, the viscous bottom layer of the liquid film disintegrates, resulting in a reduction of the total liquid film thickness. When the gas-phase velocity is low, the local deformation exerts a greater shear force on the disturbance wave, prolonging the action time and increasing the likelihood of wave disintegration. Under conditions of no channel deformation, the disturbance wave wavelength is negatively correlated with the gas-phase velocity; conversely, under localized channel deformation, the wavelength is positively correlated with the gas-phase velocity. Thus, the effect of localized deformation on wavelength is bidirectional. Local deformation impact factor functions for liquid film thickness, disturbance wave height, and disturbance wave wavelength have been derived, with the error of these impact factor functions maintained within ±30 %.

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局部变形窄矩形通道中环形流体膜特性的实验研究

由于中子辐照引起的板状燃料组件局部变形将导致流道内传热恶化。研究矩形窄通道局部变形条件下环形流膜的流动特性，为理解矩形窄通道局部变形条件下的传热传质和流体动力特性奠定了基础。本研究在狭窄的矩形通道中，在无局部变形、椭球形变形和枕形变形三种情况下进行环流液膜表征实验。利用高速摄像采集系统和先进的图像处理技术，获得了环流液膜的液膜厚度、扰动波高度和扰动波波长等参数。分析了流动条件和局部变形对各环空流动液膜参数的影响。随着局部变形径向尺寸相对于液膜厚度的增大，液膜粘性底层崩解，导致液膜总厚度减小。当气相速度较低时，局部变形对扰动波施加更大的剪切力，延长了作用时间，增加了扰动波解体的可能性。在无通道变形条件下，干扰波波长与气相速度呈负相关；相反，在局部通道变形下，波长与气相速度呈正相关。因此，局部变形对波长的影响是双向的。推导了液膜厚度、扰动波高度和扰动波波长的局部变形影响因子函数，影响因子函数的误差保持在±30%以内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.