Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (3): 1228-1239.DOI: 10.16085/j.issn.1000-6613.2022-0911

• Chemical processes and equipment • Previous Articles     Next Articles

Boiling curve and onset of nucleate boiling of microchannels with corrugated walls

LUO Xiaoping1(), FAN Peng1, ZHOU Jianyang2, WANG Mengyuan1   

  1. 1.School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
    2.School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China
  • Received:2022-05-17 Revised:2022-06-07 Online:2023-04-10 Published:2023-03-15
  • Contact: LUO Xiaoping

不同波纹壁面微细通道沸腾曲线及沸腾起始点研究

罗小平1(), 樊鹏1, 周建阳2, 王梦圆1   

  1. 1.华南理工大学机械与汽车工程学院,广东 广州 510640
    2.广西大学化学化工学院,广西 南宁 530004
  • 通讯作者: 罗小平
  • 作者简介:罗小平(1967—),教授,博士生导师,主要研究方向为微通道换热器相变传热、EHD强化沸腾传热及其控制。E-mail:mmxpluo@scut.edu.cn
  • 基金资助:
    国家自然科学基金(22178118);广东省自然科学基金(2019A1515011053)

Abstract:

In order to explore the influence of mass flow rates on boiling starting point in microchannels with different walls, three kinds of microchannels with different corrugated walls were made by computer numerical control technology. R141b was used as the experimental working medium, and the power of the heating plate was adjusted at the inlet temperature of 33℃ and the pressure of 60kPa. The boiling curves of three different corrugated walls were measured under the conditions of mass flow rates of 203.75kg/(m2·s), 255.68kg/(m2·s), 307.61kg/(m2·s), 358.59 kg/(m2·s) and 409.57kg/(m2·s), respectively. By analyzing the boiling curves of each wall microchannel under different mass flow rates, the change rules of superheat and heat flux at ONB point were summarized. Furthermore, the boiling curves of different wall microchannels under the same mass flow rate were compared, and the reason for the decrease of superheat at the boiling starting point of corrugated wall was analyzed. Finally, compared with the existing typical ONB prediction model, the parameters related to mass flow rate are introduced based on the correlation of Hsu model for correction. The results showed that with the increase of mass flow rate, the measured wall superheat of ONB point decreased for the same kind of wall microchannel. At the same mass flow rate, the superheat of ONB point of ordinary microchannel was the highest, followed by sinusoidal microchannel, and the superheat of ONB point of triangular microchannel was the lowest. Compared with six typical ONB forecasting models, it was found that the overall forecasting effect of Hsu model was good, especially the average absolute error of triangular microchannel was 7.56%. Based on the correlation of Hsu model, the average absolute error of ordinary, sinusoidal and triangular microchannels was 0.77%, 1.91% and 2.08%, respectively, which improved the forecasting accuracy of ONB superheat of corrugated microchannels.

Key words: microchannels, onset of nucleate boiling, corrugated walls, flow boiling, two-phase flow

摘要:

为了探究不同壁面微细通道内质量通量对沸腾起始点的影响,利用计算机数控技术制得3种不同波纹壁面的微细通道,以R141b为实验工质,在入口温度为33℃、压力为60kPa的工况下,调节加热板的功率,在质量通量为203.75kg/(m2·s)、255.68kg/(m2·s)、307.61kg/(m2·s)、358.59kg/(m2·s)和409.57kg/(m2·s)的条件下分别测定3种不同波纹壁面沸腾曲线。通过分析3种微细通道不同质量通量下的沸腾曲线,归纳ONB点的过热度和热通量变化规律,进一步比较在同一质量通量下不同壁面微细通道的沸腾曲线,分析波纹壁面沸腾起始点的过热度减小的原因,最后将实验值与现有的ONB预测模型进行对比,发现Hsu模型预测效果整体较好,但该模型没有关联质量通量因素,本文对3种波纹壁面不同质量通量作用下ONB预测模型进行了研究。研究结果表明:同一种壁面微细通道,随着质量通量增大,ONB点壁面过热度减小;相同质量通量下普通微细通道ONB点的过热度最高,正弦微细通道次之,三角形微细通道最低;本文的ONB预测模型对普通、正弦和三角形微细通道预测平均绝对误差值分别为0.77%、1.91%和2.08%。

关键词: 微通道, 沸腾起始点, 波纹壁面, 流动沸腾, 两相流

CLC Number: 

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