添加纳米颗粒强化池沸腾的实验研究,通过表面表征和气泡动力学分析,揭示了纳米流体沸腾强化的机制以及表面活性剂对纳米流体沸腾的影响。研究结果表明,纳米颗粒在沸腾过程中沉积在加热表面上,从而增加表面粗糙度并降低接触角,这有助于促进气泡成核与脱离,同时增强液体的补充能力。
Silica nanofluids are prepared with a concentration varying from 0.001 vol.% to 0.003 vol.%, and pool boiling of the nanofluids is experimentally investigated. It is found that critical heat flux and heat transfer coefficient increase by a maximum of 62.66% and 45.88% compared with deionized water. The best boiling performance is achieved with the nanofluid of 0.002 vol.%. In addition, the paper further investigated the effect of surfactants on nanofluid boiling, i.e., cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS), and polysorbate 20 (Tween 20). The heat tran