混合基纳米流体在汽车散热器中的稳定性及传热特性

摘 要 使用SiO2和MWCNT纳米颗粒，在80%：20%的水/乙二醇基液中制备纳米流体，分别研究超声波振荡时间、分散剂对纳米流体稳定性的影响，结果表明：最佳振荡时间为1 h；十六烷基三甲基氯化铵（CTAC）的最佳添加量为质量分数0.05%，十二烷基苯磺酸钠（SDBS）的最佳添加量为0.1%；在最佳添加量下，CTAC的分散效果优于SDBS；在同一分散剂下，MWCNT-水/乙二醇混合基纳米流体的稳定性优于SiO2-水/乙二醇混合基纳米流体。研究不同浓度的纳米流体在不同流速、温度下的传热特性进行分析。结果表明，与基液相比，纳米流体的传热速率有了明显的提高；与纳米流体的传热速率增加相比，纳米流体浓度对压降和有效泵功的不利影响可以忽略不计。

Stability and Heat Transfer Characteristics in Automotive Radiators of Mixed-based Nanofluids

[Abstract] Preparation of nanofluids in 80%: 20% water/ethylene glycol using SiO2 and MWCNT nanoparticles. The effects of ultrasonic oscillation time and dispersant on the stability of nanofluids were studied. The optimum oscillation time was 1 h. The optimum addition amount of cetyltrimethylammonium chloride (CTAC) was 0.05%. The optimal addition amount of sodium dodecylbenzene sulfonate (SDBS) is 0.1%; under the optimal addition amount, the dispersion effect of CTAC is better than SDBS; The stability of MWCNT-water/glycol mixed-based nanofluids is better than that of SiO2 at the same mass fraction of dispersant. The heat transfer characteristics of different concentrations of nanofluids at different flow rates and temperatures were investigated. The results show that compared with the base fluid, the heat transfer rate of the nanofluid has been significantly improved; compared with the increase of the heat transfer rate of the nanofluid, the adverse effect of the nanofluid concentration on the pressure drop and effective pump work is negligible.