化工学报 ›› 2023, Vol. 74 ›› Issue (10): 4097-4108.DOI: 10.11949/0438-1157.20230825

• 流体力学与传递现象 • 上一篇    下一篇

旋流作用下水基炭黑纳米流体集热性能研究

于晓宇1(), 安瑛1(), 左夏华2, 李凯1, 张锋华1, 焦志伟1, 杨卫民1   

  1. 1.北京化工大学机电工程学院,北京 100029
    2.中国科学院广州能源研究所,广东 广州 510640
  • 收稿日期:2023-08-14 修回日期:2023-09-19 出版日期:2023-10-25 发布日期:2023-12-22
  • 通讯作者: 安瑛
  • 作者简介:于晓宇(1998—),男,硕士研究生,yuxiaoyu9808@163.com
  • 基金资助:
    国家自然科学基金项目(52176175)

Study on the heat collection performance of water-based carbon black nanofluid under swirling flow

Xiaoyu YU1(), Ying AN1(), Xiahua ZUO2, Kai LI1, Fenghua ZHANG1, Zhiwei JIAO1, Weimin YANG1   

  1. 1.School of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
    2.Guangzhou Energy Research Institute, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
  • Received:2023-08-14 Revised:2023-09-19 Online:2023-10-25 Published:2023-12-22
  • Contact: Ying AN

摘要:

主动强化技术是提升集热器效率的有效手段。本研究利用管式有源强化集热装置,系统研究了旋流作用下辐照强度、纳米流体浓度、转子转速、转子数量及排布方式、转子颜色及类型等对水基炭黑纳米流体集热性能的影响。结果表明,光热转换效率随辐照强度的增加而显著增加;炭黑-胶原蛋白的加入使介质同时间段的全程光热转换效率提升了56.6%~216.7%,质量分数为0.005%的水基炭黑纳米流体光热转换效率最高的同时能效比也较高;转子转速在150 r/min时,全程光热转换效率最终提升了30.32%,继续提升转子转速不会增加纳米流体的集热效率;转子均匀排布时,将转子数量减少一半几乎不会影响集热效率;转子颜色及类型的搭配对不同浓度的纳米流体集热效率具有协同作用,黑色低流阻转子在纯水及高浓度纳米流体中集热效果较好,白色两叶片转子在中低浓度的纳米流体中集热效果较好。本研究明确了转子旋流下影响纳米流体集热性能的规律,为太阳能光热利用提供了新的思路。

关键词: 组合转子, 动态集热, 纳米粒子, 传热, 辐射

Abstract:

Active reinforcement technology is an effective means to improve the efficiency of heat collectors. This study systematically investigated the effects of irradiation intensity, nanofluid concentration, rotor speed, number and arrangement of rotors, rotor color and type on the heat collection performance of water-based carbon black nanofluids under the action of swirling flow using a tubular active enhanced heat collection device. The results show that the photothermal conversion efficiency significantly increases with the increase of irradiation intensity. The addition of carbon black collagen protein increased the full range photothermal conversion efficiency of the medium by 56.6% to 216.7% during the same time period. The water-based carbon black nanofluid with a mass fraction of 0.005% had the highest photothermal conversion efficiency and higher energy efficiency ratio. At a rotor speed of 150 r/min, the full range photothermal conversion efficiency ultimately increased by 30.32%, and further increasing the rotor speed will not increase the heat collection efficiency of the nanofluid. When the rotors are evenly arranged, reducing the number of rotors by half will hardly affect the heat collection efficiency. The combination of rotor color and type has a synergistic effect on the heat collection efficiency of different concentrations of nanoluids. Black low flow resistance rotors have better heat collection effects in pure water and high concentration nanofluids, while the two white blade rotors have better heat collection effects in medium and low concentration nanofluids. This study clarifies the rules that affect the heat collection performance of nanofluid under rotor swirling flow, and provides new ideas for solar photothermal utilization.

Key words: assembled rotors, dynamic heat collection, nanoparticles, heat transfer, radiation

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