Experimental study on the downward-facing surface enhanced boiling heat transfer of multiscale groove-fin structures

doi:10.11949/0438-1157.20230076

Abstract

Abstract:

External pressure vessel cooling (ERVC) technology, as a technical means to achieve in-reactor melt retention (IVR) in nuclear reactors, needs to achieve higher heat transfer rates. This study used heated plate surfaces with different downward orientations to simulate the boiling heat transfer during ERVC process on the local area of the outer reactor pressure vessel (RPV) lower head, and the advanced additive manufacturing of cold spraying (CS-AM) was applied to directly fabricate multiscale groove-fin arrays on the heated surfaces. After going through downward-facing critical pool boiling experiments in the environment of atmosphere and saturated water, the boiling curves were obtained and compared with bare surface to evaluate the performance of enhancing boiling heat transfer. The results indicated that the mulitscale structured surfaces not only had excellent critical heat flux (CHF)-enhancing ability with more than 60% CHF increase over the bare surface, but also had better boiling heat transfer coefficient (BHTC) performance. In terms of thermal characteristics, the positive impact of the synergistic effect of multiscale structures on CHF was fully reflected. Significantly, this work provided an important basis for the application of CS-AM technology in the field of ERVC.

Key words: phase change, heat transfer, multiscale, enhanced boiling, cold spraying & additive manufacturing, critical heat flux, boiling heat transfer coefficient

摘要：

压力容器外部冷却（ERVC）技术作为实现核反应堆堆内熔融物滞留（IVR）的技术手段，存在实现更高换热速率的需求。采用可旋转朝下平板换热表面模拟ERVC过程中下封头局部位置的沸腾状况，基于冷喷涂（CS）的增材制造（AM）技术在换热表面上制备出具有多尺度的沟槽翅片状强化换热结构。在常压饱和去离子水环境中，开展了临界沸腾换热实验，获得了沸腾曲线，并与裸表面结果进行了性能对比。研究结果表明多尺度结构表面不仅具备传统翅片结构的临界热通量（CHF）强化能力，CHF增幅60%以上，且具有更高的沸腾传热系数，体现了多尺度协同强化换热的正向效应。本结果可为CS-AM技术在强化沸腾换热技术领域，尤其是ERVC领域的应用提供重要依据。

关键词: 相变, 传热, 多尺度, 强化沸腾, 冷喷涂增材制造技术, 临界热通量, 沸腾传热系数

CLC Number:

TQ 026.4

Haopeng SHI, Dawen ZHONG, Xuexin LIAN, Junfeng ZHANG. Experimental study on the downward-facing surface enhanced boiling heat transfer of multiscale groove-fin structures[J]. CIESC Journal, 2023, 74(7): 2880-2888.

史昊鹏, 钟达文, 廉学新, 张君峰. 朝下多尺度沟槽翅片结构表面沸腾换热实验研究[J]. 化工学报, 2023, 74(7): 2880-2888.

Figures/Tables 12

Fig.1 Schematic diagram of experimental system

Fig.2 Schematic diagram of heating and experimental elements

Fig.3 Arrangement of temperature measuring points

Fig.4 Variation of temperature and heat flux in the experimental process

Fig.5 Schematic diagram of the cold spray system and the manufacturing process

Fig. 6 SEM images and photos of CS-AM-fabricated groove arrays

Table 1 Geometric parameters of groove-fin structure

翅片横截面形状	翅片宽度B/mm	槽道间距S/mm	槽道深度H/mm	翅片数目n
梯形截面	1.2	1	1.5	21
三角形截面	1.2	1.5	1.5	17

Fig.7 Pool boiling curves at different inclination angles

Fig.8 Curves of BHTC varies with heat flux at different inclination angles

Fig.9 CHF-comparison of different modified surfaces

Fig.10 CHF-comparison of different bare surfaces

Fig.11 Comparison of CHF increase of different modified surfaces

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