不同振幅正弦振动通道内超临界正癸烷热裂解对流换热特性分析

doi:10.11949/0438-1157.20250008

化工学报

• •

不同振幅正弦振动通道内超临界正癸烷热裂解对流换热特性分析

黄娜¹(), 钟豫¹, 蒋云龙², 吴明婷³^,⁴(), 李洪伟⁵

^1.东北电力大学能源与动力工程学院，吉林吉林 132012
^2.华电新能源集团股份有限公司辽宁分公司，辽宁沈阳 110179
^3.石河子大学能源与材料学院，新疆石河子 832003
^4.石河子大学兵团能源发展研究院，新疆石河子 832003
^5.东北电力大学自动化工程学院，吉林吉林 132012

收稿日期:2025-01-03 修回日期:2025-06-10 出版日期:2025-07-14
通讯作者: 吴明婷
作者简介:黄娜（1987—），女，博士，讲师，hn20162662@163.com
基金资助:
吉林省科技发展计划项目(YDZJ202301ZYTS268);吉林省教育厅科研项目(JJKH20230113KJ);东北电力大学青年博士科研助推计划项目(BSZT15202405)

Analysis of thermal cracking convective heat transfer characteristics of supercritical n-decane in sinusoidal vibration channels with different amplitudes

Na HUANG¹(), Yu ZHONG¹, Yunlong JIANG², Mingting WU³^,⁴(), Hongwei LI⁵

^1.School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, Jinlin, China
^2.Huadian New Energy Group, Liaoning Branch of Inc, Shenyang 110179, Liaoning, China
^3.School of Energy and Materials, Shihezi University, Shihezi 832003, Xinjiang, China
^4.Institute of Bingtuan Energy Development Research, Shihezi University, Shihezi 832003, Xinjiang, China
^5.Northeast Electric Power University, School of Automation Engineering, Jilin 132012, Jinlin, China

Received:2025-01-03 Revised:2025-06-10 Online:2025-07-14
Contact: Mingting WU

摘要/Abstract

摘要：

各类对流换热设备都必然伴随有振动现象，特别是换热工质包含复杂化学反应过程时，亟待探明其多场耦合机理。基于正癸烷裂解总包反应模型，对0、0.5、1和2 mm振幅下振动通道内超临界正癸烷裂解流动换热过程开展数值研究。结果显示，通道振动使流体产生强烈的纵向涡旋，且振幅越高Se越大，流动阻力随之显著提高。不同振幅下，裂解反应均发生在L/D>100区，在120<L/D<140区达到裂解反应速率峰值。L/D>140区正癸烷裂解率沿流向波动分布，且振幅越大裂解率越高。正癸烷裂解吸热反应对热流场的扰动起始于边界层，随着振幅提高，通道内速度边界层厚度减小、温度边界层和物性边界层厚度增大。进入缓冲层后，振幅不同引起的差异逐渐扩大，进而影响主流区的质量、动量和能量输运。综合分析不同振幅下通道的热沉与流动阻力，提出振动通道的综合换热性能较静止通道下降2.90~29.02%。

关键词: 超临界正癸烷, 通道振动, 对流, 化学反应, 计算流体力学

Abstract:

All kinds of convective heat transfer equipment are inevitably accompanied by vibration phenomena, especially when the heat transfer medium contains complex chemical reaction processes, it is urgent to explore its multi-field coupling mechanism. Based on the total package reaction model of n-decane cracking, numerical studies were conducted on the flow heat transfer process of supercritical n-decane cracking in the vibration channel at amplitudes of 0, 0.5, 1 and 2 mm. The results show that the vibration of the channel causes a strong longitudinal vortex in the fluid, and the higher the amplitude, the greater the Se, accompanied by a significant increase in flow resistance. Under different amplitudes, the cracking reaction occurred in the L/D>100 region and reached the peak rate of the cracking reaction in the 120<L/D<140 region. The cracking rate of n-decane in the L/D>140 zone fluctuates along the flow direction, and the larger the amplitude, the higher the cracking rate. The perturbation of the heat flow field by the endothermic reaction of n-decane cracking begins at the boundary layer. As the amplitude increases, the thickness of the velocity boundary layer in the channel decreases, and the thicknesses of the temperature boundary layer and the physical property boundary layer increase. After entering the buffer layer, the differences caused by different amplitudes gradually increase, thereby affecting the mass, momentum and energy transport in the mainstream area. By comprehensively analyzing the heat sink and flow resistance of the channel under different amplitudes, it is proposed that the comprehensive heat transfer performance of the vibrating channel decreases by 2.90~29.02% compared with the stationary channel.

Key words: supercritical n-decane, channel vibration, convection, chemical reaction, computational fluid dynamics

中图分类号:

TQ 021.3

黄娜, 钟豫, 蒋云龙, 吴明婷, 李洪伟. 不同振幅正弦振动通道内超临界正癸烷热裂解对流换热特性分析[J]. 化工学报, DOI: 10.11949/0438-1157.20250008.

Na HUANG, Yu ZHONG, Yunlong JIANG, Mingting WU, Hongwei LI. Analysis of thermal cracking convective heat transfer characteristics of supercritical n-decane in sinusoidal vibration channels with different amplitudes[J]. CIESC Journal, DOI: 10.11949/0438-1157.20250008.

图/表 16

Fig.1 Physical modeFig.2Schematic diagram of the cross-section

图3 网格无关性验证

Fig.3 Grid-independent validation

图4 裂解流动换热数值模型验证

Fig.4 Numerical model validation of pyrolysis flow and heat transfer

图5 通道振动示意图

Fig.5 The schematic diagram of the channel vibration

图6 不同湍流模型对比

Fig.6 Comparison of different turbulence models

图7 RNG k-ε湍流模型对比结果

Fig.7 Comparison result of RNG k-ε turbulence model

图8 不同振幅对温度场特性的影响

Fig.8 Effect of different vibration amplitude on the temperature field distribution

图9 热壁表面正癸烷质量分数

Fig.9 Mass fraction of n-decane on hot wall

图10 Gr/Re2值分布

Fig.10 Distribution of Gr/Re2

图11 Se分布

Fig.11 Distributions of Se

图12 Nu与Se间关系

Fig.12 Relationship between Nu and Se

图13 不同振幅下流线分布

Fig.13 Streamline under different vibration amplitude

图14　不同工况下通道横截面内流线分布

Fig.14　Streamline distribution in cross section of tube under different vibration amplitude

	L/D=60	L/D=140	L/D=160	L/D=180	L/D=210
A=0.5 mm
A=1.0 mm
A=2.0 mm

图15 L/D=130处不同振幅下内部边界层区参数分布

Fig.15 Parameter distribution of internal boundary layer region under different vibration amplitude at L/D=130

图16 L/D=130处不同振幅边界层内参数分布

Fig.16 Border layer parameter distribution under different vibration amplitude at L/D=130

表1 不同振幅下综合流动换热性能比较

Table 1 Comparison of comprehensive flow heat transfer performance under different vibration amplitude

振幅	0.5 mm	1 mm	2 mm	4 mm
Nu_v/Nu_s	0.894	0.942	0.855	0.721
相对变化	——	+5.37%	-9.24%	-15.67%
f_v/f_s	1.264	1.617	2.368	3.980
相对变化	——	+27.93%	+46.44%	+68.02%
η	0.827	0.803	0.641	0.455
相对变化	——	-2.90%	-20.17%	-29.02%

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不同振幅正弦振动通道内超临界正癸烷热裂解对流换热特性分析

Analysis of thermal cracking convective heat transfer characteristics of supercritical n-decane in sinusoidal vibration channels with different amplitudes

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