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Systematic measurements of heat transfer characteristics in saturated pool boiling of water-based nanofluids

机译:水基纳米流体饱和池沸腾中传热特性的系统测量

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Experiments were carried out to investigate the heat transfer characteristics in saturated pool boiling of water-based nanofluids. An upward-facing copper surface of 20 mm in diameter was used as the heated surface. Main experimental parameters in this work were nanoparticles' material (TiO_2, Al_2O_3 and SiO_2), mass concentration (0.04, 0.4 and 1 kg/m~3) and dispersion condition (fine and coarse dispersions). Effects of these parameters on the time-variation of wall superheat under constant heat flux, the heat transfer coefficient (boiling curve) and the critical heat flux (CHF) were explored. It was found that the particle dispersion condition has no noticeable influence on the heat transfer characteristics within the range tested in this work. Whilst, the material and concentration of nanoparticles greatly affected the time-variation of wall superheat and the boiling curve. In particular, it was found that the wall superheat likely to increase significantly when the nanopartide layer formed on the heated surface is partially detached. The CHF in nanofluid was 2.5-3 times higher than that for pure water in all the experimental conditions.
机译:进行实验以研究水基纳米流体在饱和池沸腾中的传热特性。直径为20 mm的朝上铜表面用作加热表面。这项工作的主要实验参数是纳米粒子的材料(TiO_2,Al_2O_3和SiO_2),质量浓度(0.04、0.4和1 kg / m〜3)和分散条件(细分散和粗分散)。探索了这些参数对恒定热通量下壁过热的时变,传热系数(沸腾曲线)和临界热通量(CHF)的影响。已经发现,在该工作中测试的范围内,颗粒分散条件对传热特性没有明显的影响。同时,纳米粒子的材料和浓度极大地影响了壁过热和沸腾曲线的时间变化。特别地,发现当在加热表面上形成的纳米粒子层部分分离时,壁过热可能显着增加。在所有实验条件下,纳米流体中的CHF均比纯水的CHF高2.5-3倍。

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