【摘要】 通过"两步法"制备分散均匀、稳定的单壁碳纳米管/水、多壁碳纳米管/水碳纳米流体,通过差示扫描量热法(DSC)测试分析了碳纳米流体的凝固、熔化相变过程,实验结果表明在凝固相变过程中随着碳纳米管质量分数的增加,碳纳米流体的起始凝固温度及凝固温度逐渐升高,单壁碳纳米流体的凝固温度显著提高,在熔化相变过程中,碳纳米流体的质量分数对于纳米流体的熔点无明显影响,但对于碳纳米流体的潜热影响较大,碳纳米流体的潜热随着质量分数的增加而明显减小。更多还原

【Abstract】 By two-step method,the carbon-water nanofluids were made from the carbon nanotubes and a certain proportional dispersant in deionized water.The influences of mass fraction,diameter of carbon nanotubes on the solidification and melting properties of nanofluids were studied by differential scanning calorimetry(DSC).The experiment results indicated that the onset temperature of solidification and solidification temperature increased with increasing mass fraction of carbon nanotubes,and compared with the same mass fraction of multi-wall carbon nanofluids,the solidification temperature of single-wall carbon nanofluids increased more.The fusion temperature wasn’t affected by mass fraction of carbon nanotubes,the latent heat decreased with increasing mass fraction of carbon nanotubes.更多还原