沉浸式换热器超声强化传热影响因素

doi:10.16085/j.issn.1000-6613.2021-0131

化工进展 ›› 2022, Vol. 41 ›› Issue (1): 40-51.DOI: 10.16085/j.issn.1000-6613.2021-0131

沉浸式换热器超声强化传热影响因素

林伟翔¹(), 苏港川¹, 陈强², 文键³, AKRAPHON Janon⁴, 王斯民¹()

^1.西安交通大学化学工程与技术学院，陕西西安 710049
^2.中石化炼化工程集团洛阳技术研发中心，河南洛阳 471003
^3.西安交通大学能源与动力工程学院，陕西西安 710049
^4.孔敬大学工程学院机械工程系，泰国孔敬 40002

收稿日期:2021-01-20 修回日期:2021-02-26 出版日期:2022-01-05 发布日期:2022-01-24
通讯作者: 王斯民
作者简介:林伟翔（1998—），男，硕士研究生，研究方向为超声波过程强化。E-mail：lwx_xwl@stu.xjtu.edu.cn。
基金资助:
国家自然科学基金(51676146);超声波-微滤强化渣油加氢工程技术开发(120070)

Influencing factors of ultrasound enhanced heat transfer of immersed coil heat exchanger

LIN Weixiang¹(), SU Gangchuan¹, CHEN Qiang², WEN Jian³, AKRAPHON Janon⁴, WANG Simin¹()

^1.School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
^2.SEG R&D Center of Engineering Technology, Luoyang 471003, Henan, China
^3.School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
^4.Department of Mechanical Engineering, Faculty of Engineering, Khon Kaen Univertity, Khon Kaen 40002, Thailand

Received:2021-01-20 Revised:2021-02-26 Online:2022-01-05 Published:2022-01-24
Contact: WANG Simin

摘要/Abstract

摘要：

以沉浸式换热器为研究对象，通过壁面加载超声波，比较了超声波振幅、换热器入口流速和管外压力对超声波效应及强化传热效果的影响。结果表明：超声波振幅由20μm增大至35μm时，表面对流传热系数增幅由15.67%增至26.71%；管外压力由0.1MPa增大至1.0MPa时，表面对流传热系数增幅由20.95%增至48.43%；入口流速由1.0m/s降低至0.05m/s时，表面对流传热系数增幅由1.76%增至39.01%。增大超声波振幅、环境压力和减小介质流速均能增强超声波声流现象和空化效应，有效提高超声波强化传热效果；高压环境会使同振幅、同频率超声振动作用下声功率呈指数增长，高流速会降低流体介质的声能密度，两种情况都需要匹配合适的超声波以保证强化传热最佳效果。

关键词: 强化传热, 沉浸式换热器, 超声波, 多相流

Abstract:

Taking the immersed coil heat exchanger as the research object, the ultrasonic wave was imposed by means of vibration surface, and the influence of the ultrasonic amplitude and the inlet flow rate of the heat exchanger and the pressure outside the tube on the ultrasonic effect and the heat transfer enhancement were compared. The results showed that the increase of ultrasonic amplitude from 20μm to 35μm resulted in the increase of surface heat transfer coefficient from 15.67% to 26.71%, and the increase of external pressure from 0.1MPa to 1.0MPa led to the increase of surface heat transfer coefficient from 20.95% to 48.43%. When the inlet flow rate was reduced from 1.0m/s to 0.05m/s, the surface heat transfer coefficient increased from 1.76% to 39.01%. Increasing the ultrasonic amplitude, environmental pressure and reducing the medium flow rate could all enhance the acoustic streaming and acoustic cavitation effect and effectively improved the ultrasonic heat transfer enhancement effect; the high-pressure environment will cause the sound power to increase exponentially under the same amplitude and frequency ultrasonic vibration, and the high flow rate would reduce the sound energy density of the fluid medium. Both cases needed to match the appropriate ultrasound power to ensure the best effect of enhanced heat transfer.

Key words: heat transfer enhancement, immersed coil heat exchanger, ultrasound, multiphase flow

中图分类号:

TK124

林伟翔, 苏港川, 陈强, 文键, AKRAPHON Janon, 王斯民. 沉浸式换热器超声强化传热影响因素[J]. 化工进展, 2022, 41(1): 40-51.

LIN Weixiang, SU Gangchuan, CHEN Qiang, WEN Jian, AKRAPHON Janon, WANG Simin. Influencing factors of ultrasound enhanced heat transfer of immersed coil heat exchanger[J]. Chemical Industry and Engineering Progress, 2022, 41(1): 40-51.

图/表 18

图1 几何模型（单位：mm）

图2 网格无关性验证及网格示意图

图3 试样表面参数曲线

图4 振动表面声压曲线

图5 变振幅工况正负压分布云图

图6 变振幅工况速度矢量图

图7 变振幅工况气相分率曲线

图8 声压快速傅里叶变换图

图9 变振幅工况时均气相分率增幅曲线

图10 各参数随振幅变化曲线

图11 变管外压力工况正负压分布云图

图12 变管外压力工况速度矢量图

图13 变管外压力工况时均气相分率增幅曲线

图14 各参数随管外压力变化曲线

图15 变入口流速工况正负压分布云图

图16 变入口流速工况速度矢量图

图17 变入口流速工况时均气相分率增幅曲线

图18 各参数随入口流速变化曲线

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沉浸式换热器超声强化传热影响因素

Influencing factors of ultrasound enhanced heat transfer of immersed coil heat exchanger

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