预冷通道中超临界甲烷换热特性分析

doi:10.16085/j.issn.1000-6613.2023-0657

摘要/Abstract

摘要：

为了研究甲烷预冷器的预冷性能，本文基于Realizable k-ε湍流模型开展了预冷通道中超临界甲烷换热特性数值研究。探究了甲烷压力和预冷器结构参数对换热的影响机制。讨论了通道截面温度场和流场特征，探究了离心力及二次流对换热的影响，分析传热过程熵产。考察了热加速对换热的影响，提出了新的热加速量纲为1因子和判别准则，综合离心力项和热加速项建立了换热关联式。结果表明：进口段热边界层低热导率引起传热恶化问题，离心力造成周向换热差别。通道截面出现较强二次流，其传热熵产显著。甲烷压力提高有利于抑制传热恶化且削弱离心力作用；预冷器外径增大会增强离心力且使传热恶化加剧。当热加速因子Ac高于8.19×10^-7时，热加速对传热恶化发挥作用。提出的换热关联式可以有效实现预冷通道中超临界甲烷的换热预测。

关键词: 微通道, 超临界甲烷, 传热, 离心力, 熵产, 数值分析

Abstract:

In order to study the precooling performance of methane precooler, numerical research on heat transfer characteristics of supercritical methane in precooling channels were carried out based on Realizable k-ε turbulence model. Influence mechanisms of methane pressure and precooler structural parameter on heat transfer were analyzed. Temperature field and flow field characteristics in the channel section were discussed, the effects of centrifugal force and secondary flow on heat transfer were explored, and the entropy generation in the heat transfer process was analyzed. The influence of thermal acceleration on heat transfer was investigated, and a new dimensionless factor and criterion for thermal acceleration were proposed. The heat transfer correlation was established by combining the centrifugal force term and the thermal acceleration term. The results show that the low thermal conductivity of thermal boundary layer in the inlet region causes the heat transfer deterioration, and the centrifugal force leads to the circumferential difference in heat transfer. The strong secondary flow appears in the channel cross-section, and the heat transfer entropy generation is significant. The increase in methane pressure is beneficial for suppressing the heat transfer deterioration and weakening the effect of centrifugal force. The increase in outer diameter of precooler will enhance the centrifugal force and exacerbate the heat transfer deterioration. When Ac exceeds 8.19×10^-7, the thermal acceleration plays a role in the deterioration of heat transfer. The proposed heat transfer correlation can effectively predict the heat transfer of supercritical methane in precooled channels.

Key words: microchannels, supercritical methane, heat transfer, centrifugal force, entropy generation, numerical analysis

中图分类号:

V231.1

王彦红, 蒋雷, 薛帅, 李洪伟, 贾玉婷. 预冷通道中超临界甲烷换热特性分析[J]. 化工进展, 2024, 43(4): 1690-1699.

WANG Yanhong, JIANG Lei, XUE Shuai, LI Hongwei, JIA Yuting. Analysis on heat transfer characteristics of supercritical methane in precooling channels[J]. Chemical Industry and Engineering Progress, 2024, 43(4): 1690-1699.

图/表 18

图1 预冷通道

表1 网格无关性分析

网格数量	出口温度/K	出口流速/m·s^-1
1546×1600	581.45	20.31
2363×1600	583.48	20.87
3178×1600	583.34	20.88
2363×900	581.68	20.24
2363×2300	583.26	20.86

图2 预冷通道网格

图3 甲烷热物性随温度的变化情况

图4 模型验证

图5 不同压力下换热参数沿流动方向的变化情况

图6 不同压力下管截面流体温度分布情况

图7 不同压力下管截面流速分布情况

图8 不同压力下换热系数的周向分布情况

图9 不同压力下Ric、De和Hm沿流动方向变化情况

图10 不同压力下传热熵产沿流动方向的变化情况

图11 不同D2下换热参数沿流动方向变化情况

图12 不同D2下换热系数的周向分布情况

图13 不同D2下De、Ric和Hm沿流动方向的变化情况

图14 不同D2下传热熵产沿流动方向的变化情况

图15 定密度和变密度时换热系数沿流动方向的变化情况

图16 不同工况下Ac沿流动方向的变化情况

图17 换热关联式计算Nu与数值数据的比较情况

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