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首页> 外文会议>ASME/JSME International Conference on Nuclear Engineering >EFFECTS OF HEAT EXCHANGER TUBE PARAMETERS ON NUCLEATE POOL BOILING HEAT TRANSFER IN A SCALED IRWST
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EFFECTS OF HEAT EXCHANGER TUBE PARAMETERS ON NUCLEATE POOL BOILING HEAT TRANSFER IN A SCALED IRWST

机译：换热器管参数对缩放IRWST中核池沸腾热传递的影响

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摘要

In an effort to determine the combined effects of major parameters of heat exchanger tubes on the nucleate pool boiling heat transfer in the scaled in-containment refueling water storage tank (IRWST), a total of 1,966 data for q" versus ΔT has been obtained using various combinations of tube diameters, surface roughness, and tube orientations. The experimental results show that (1) increased surface roughness enhances heat transfer for both horizontal and vertical tubes, (2) the two heat transfer mechanisms, i.e., enhanced heat transfer due to liquid agitation by bubbles generated and reduced heat transfer by the formation of large vapor slugs and bubble coalescence are different in two regions of low heat fluxes (q" ≤ 50 kW/m{sup}2) and high heat fluxes (q" > 50 kW/m{sup}2) depending on the orientation of tubes and the degree of surface roughness, and (3) the heat transfer rate decreases as the tube diameter is increased for both horizontal and vertical tubes, but the effect of tube diameter on the nucleate pool boiling heat transfer for vertical tubes is greater than that for horizontal tubes. Two empirical heat transfer correlations for q", one for horizontal tubes and the other for vertical tubes, are obtained in terms of surface roughness (ε) and tube diameter (D). In addition, a simple empirical correlation for nucleate pool boiling heat transfer coefficient (h{sub}b) is obtained as a function of heat flux (q" ) only.
机译：努力确定热交换器管主要参数对缩放内含物加油储水箱（IRWST）中的核心池沸腾热传递的主要参数的组合效果，使用的总共1,966个数据与ΔT进行了管直径，表面粗糙度和管取向的各种组合。实验结果表明，（1）增加的表面粗糙度增强了水平和垂直管的热传递，（2）两个传热机制，即引起的热传递增强通过气泡产生的液体搅拌和通过形成大的蒸汽块和气泡聚结的热传递在低热量通量的两个区域（Q“≤50kW/ m {sup} 2）和高热量（q”> 50 kw / m {sup} 2）取决于管的方向和表面粗糙度的程度，并且（3）随着管直径增加水平和垂直管，传热速率降低，但管D的效果IAMETER对垂直管的核池沸腾的热传递大于水平管的热传递。关于Q“，用于垂直管的两个实验传热相关性，用于垂直管的另一个用于垂直管，在表面粗糙度（ε）和管直径（D）方面获得。此外，核心池沸腾热传递的简单实证相关性作为热通量（Q“）的函数获得系数（H {Sub} B）。

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