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纳米流体地热循环换热实验研究

代钊恺 杨现禹 解经宇 张健 侯继武 刘梦娟 蔡记华

代钊恺, 杨现禹, 解经宇, 张健, 侯继武, 刘梦娟, 蔡记华. 纳米流体地热循环换热实验研究[J]. 地质科技通报, 2024, 43(3): 48-58. doi: 10.19509/j.cnki.dzkq.tb20230588
引用本文: 代钊恺, 杨现禹, 解经宇, 张健, 侯继武, 刘梦娟, 蔡记华. 纳米流体地热循环换热实验研究[J]. 地质科技通报, 2024, 43(3): 48-58. doi: 10.19509/j.cnki.dzkq.tb20230588
DAI Zhaokai, YANG Xianyu, XIE Jingyu, ZHANG Jian, HOU Jiwu, LIU Mengjuan, CAI Jihua. Experimental study of recirculating heat transfer in geothermal wells with nanofluids[J]. Bulletin of Geological Science and Technology, 2024, 43(3): 48-58. doi: 10.19509/j.cnki.dzkq.tb20230588
Citation: DAI Zhaokai, YANG Xianyu, XIE Jingyu, ZHANG Jian, HOU Jiwu, LIU Mengjuan, CAI Jihua. Experimental study of recirculating heat transfer in geothermal wells with nanofluids[J]. Bulletin of Geological Science and Technology, 2024, 43(3): 48-58. doi: 10.19509/j.cnki.dzkq.tb20230588

纳米流体地热循环换热实验研究

doi: 10.19509/j.cnki.dzkq.tb20230588
基金项目: 

国家自然科学基金青年基金项目 42002311

大学生创新创业训练计划重点支持领域项目 X202310491020

详细信息
    作者简介:

    代钊恺, E-mail: daizhaokai@cug.edu.cn

    通讯作者:

    杨现禹, E-mail: yxy@cug.edu.cn

    蔡记华, E-mail: caijih@cug.edu.cn

  • 中图分类号: P314.2

Experimental study of recirculating heat transfer in geothermal wells with nanofluids

More Information
  • 摘要:

    提升换热介质的换热性能是高效开采地热资源的有效手段之一。添加纳米级金属氧化物可有效提升流体的换热能力, 而纳米颗粒种类、质量分数、粒径、分散剂质量分数等物性参数以及流速对纳米流体换热性能具有重要影响。采用球形纳米CuO和Al2O3(粒径20~50 nm)作为换热介质, 十二烷基苯磺酸钠(SDBS)作为分散剂配制纳米流体, 利用自主搭建的纳米流体基础换热实验装置进行室内换热实验, 优选纳米流体参数。此外, 通过自主搭建循环流动换热实验装置, 以湖北英山某水热型地热井中地热水作为热源, 讨论了在现场实际热源边界条件下, 流速对纳米流体和去离子水的换热性能影响规律。结果表明: (1)CuO纳米流体换热性能优于Al2O3纳米流体; (2)纳米流体的换热性能与纳米颗粒质量分数呈负相关关系, CuO质量分数为1%时纳米流体升温效率最高, 在150 s内温度可由25 ℃上升到79.2 ℃, 同时间内比去离子水高4.1 ℃, 同时, 随着纳米颗粒质量分数的增加, 纳米流体与热源界面的润湿性减小; (3)纳米流体换热性能随着纳米颗粒粒径增加呈现先增加后减小的趋势, 在纳米颗粒粒径为40 nm时纳米流体换热性能最佳; (4)纳米流体的换热性能与分散剂质量分数呈负相关关系, 当分散剂质量分数为1%时换热性能最佳; (5)层流状态下纳米流体的换热性能与流速呈负相关关系; 在湍流状态下纳米颗粒运动状态逐渐剧烈, 有利于纳米流体传热。研究成果可为纳米流体应用于地热换热从而提升地热系统的换热效率提供依据, 并为纳米流体参数以及流速参数的选择提供理论依据。

     

  • 图 1  纳米流体室内基础换热实验装置

    Figure 1.  Basic heat transfer experimental device of nanofluids in laboratory

    图 2  纳米流体现场测试实验装置

    Figure 2.  Test experimental device of nanofluids in field

    图 3  不同纳米颗粒种类的纳米流体升温情况

    分散剂w(SDBS)均为1%;纳米颗粒粒径均为40 nm

    Figure 3.  Temperature rise of nanofluids with different nanoparticle types

    图 4  不同纳米颗粒(CuO)质量分数和粒径的纳米流体温差曲面

    Figure 4.  Temperature difference surfaces of nanofluids with different nanoparticle mass fractions and different nanoparticle sizes

    图 5  不同纳米颗粒(CuO)质量分数的纳米流体升温情况

    a.纳米流体升温曲线; b.纳米流体与去离子水的温差曲线。分散剂为SDBS;w(SDBS)均为1%;CuO粒径均为40 nm

    Figure 5.  Temperature rise of nanofluids with different nanoparticle mass fractions

    图 6  不同纳米颗粒(CuO)质量分数的纳米流体温差曲面投影(CuO粒径均为40 nm)

    Figure 6.  Temperature difference surface projection of nanofluids with different nanoparticle mass fractions

    图 7  不同分散剂(SDBS)质量分数的纳米流体升温情况

    a.纳米流体升温曲线; b. 纳米流体与去离子水的温差曲线。纳米颗粒为CuO;w(CuO)均为1%;CuO粒径均为40 nm

    Figure 7.  Temperature rise of nanofluids with different dispersant mass fractions

    图 8  不同纳米颗粒(CuO)粒径的纳米流体温差曲面投影(w(CuO)均为1%)

    Figure 8.  Temperature difference surface projection of nanofluids with different nanoparticle sizes

    图 9  纳米流体与去离子水的换热情况

    a, c.纳米流体出口处与入口处温差随雷诺数变化关系;b, d.去离子水出口处与入口处温差随雷诺数变化关系。纳米颗粒均为CuO;w(CuO)均为1%;CuO粒径均为40 nm;w(SDBS))均为1%

    Figure 9.  Heat transfer between nanofluid and deionized water

    图 10  不同纳米颗粒(CuO)质量分数的纳米流体在不同温度下的接触角(θ)

    a~e分别为w(CuO)=1%的纳米流体在30,40,50,60,70 ℃下的接触角;f~j分别为w(CuO)=2%的纳米流体在30,40,50,60,70 ℃下的接触角;k~o分别为w(CuO)=3%的纳米流体在30,40,50,60,70 ℃下的接触角;p~n分别为w(CuO)=4%的纳米流体在30,40,50,60,70 ℃下的接触角。w(SDBS)均为1%;CuO粒径均为40 nm

    Figure 10.  Contact angles of nanofluids with different nanoparticle mass fractions at different temperatures

    图 11  不同分散剂(SDBS)质量分数的纳米流体的Zeta电位

    纳米颗粒均为CuO;CuO粒径均为40 nm;w(CuO)均为1%

    Figure 11.  Zeta potential of nanofluids with different dispersant mass fractions

    图 12  纳米颗粒在去离子水(基液)中运动状态示意图

    图中箭头为纳米颗粒运动方向,圆点为纳米颗粒

    Figure 12.  Schematic diagram of nanoparticle motion in the deionized water(base fluid)

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出版历程
  • 收稿日期:  2023-10-24
  • 录用日期:  2024-01-17
  • 修回日期:  2024-01-12

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