• •
黄娜1(), 蒋云龙2(), 王东涵1, 吴明婷1, 蒋雪莉1, 钟豫1
收稿日期:
2024-07-18
修回日期:
2024-08-08
出版日期:
2024-08-29
通讯作者:
蒋云龙
作者简介:
黄娜(1987—),女,博士,讲师,hn20162662@163.com
基金资助:
Na HUANG1(), Yunlong JIANG2(), Donghan WANG1, Mingting WU1, Xueli JIANG1, Yu ZHONG1
Received:
2024-07-18
Revised:
2024-08-08
Online:
2024-08-29
Contact:
Yunlong JIANG
摘要:
振动冷却通道内超临界正癸烷的裂解吸热流动过程因同时存在流场、温度场和物性场等多物理场间耦合作用,流动换热过程十分复杂。基于正癸烷裂解总包反应模型,对矩形振动通道内超临界正癸烷裂解流动换热过程进行数值研究,系统讨论通道振动频率对再生冷却通道流动换热性能的影响规律和作用机制。计算结果显示,通道振动会加强内部流体掺混,通道内二次流动随振动频率提高而增强,高频率振动引发的横向剪切对流体边界层产生扰动,使热侧近壁面边界层减薄,热壁的物理换热过程增强。然而,增强的物理换热降低了热壁表面正癸烷温度,使正癸烷裂解反应被推迟,化学热沉释放被延迟。不同振动频率下,裂解反应均在L/D>100处开始发生,在L/D=130处达到裂解反应速率最快。与静止通道相比,振动通道热壁表面温度、传热系数及热壁表面正癸烷质量分数均呈不同特征的周期分布。研究结果能够为运动通道内包含化学吸热反应的流动换热问题提供参考价值。
中图分类号:
黄娜, 蒋云龙, 王东涵, 吴明婷, 蒋雪莉, 钟豫. 通道振动频率对超临界正癸烷裂解流动换热影响的数值研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240815.
Na HUANG, Yunlong JIANG, Donghan WANG, Mingting WU, Xueli JIANG, Yu ZHONG. Numerical study of influence of channel vibration frequency on flow and heat transfer of supercritical n-decane with pyrolysis reaction[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240815.
振动频率 | 50 Hz | 100 Hz | 200 Hz | 400 Hz |
---|---|---|---|---|
Nuv/Nus | 0.894 | 1.07 | 1.243 | 1.405 |
相对变化 | —— | +0.20 | +0.16 | +0.13 |
fv/fs | 1.264 | 1.365 | 1.647 | 2.013 |
相对变化 | —— | +0.08 | +0.21 | +0.37 |
η | 0.827 | 0.965 | 1.052 | 1.094 |
相对变化 | —— | +0.17 | +0.09 | +0.04 |
表1 不同振动频率下综合流动换热性能比较
Table 1 Comparison of comprehensive flow heat transfer performance under different vibration frequencies
振动频率 | 50 Hz | 100 Hz | 200 Hz | 400 Hz |
---|---|---|---|---|
Nuv/Nus | 0.894 | 1.07 | 1.243 | 1.405 |
相对变化 | —— | +0.20 | +0.16 | +0.13 |
fv/fs | 1.264 | 1.365 | 1.647 | 2.013 |
相对变化 | —— | +0.08 | +0.21 | +0.37 |
η | 0.827 | 0.965 | 1.052 | 1.094 |
相对变化 | —— | +0.17 | +0.09 | +0.04 |
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