Experimental investigation of heat transfer during pool boiling of two nanofluids, i.e., water-Al2O3 and water-Cu has been carried out. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. The horizontal smooth copper and stainless steel tubes having 10 mm OD and 0.6 mm wall thickness formed test heater. The experiments have been performed to establish the influence of nanofluids concentration as well as tube surface material on heat transfer characteristics at atmospheric pressure. The results indicate that independent of concentration nanoparticle material (Al2O3 and Cu) has almost no influence on heat transfer coefficient while boiling of water-Al2O3 or water-Cu nanofluids on smooth copper tube. It seems that heater material did not affect the boiling heat transfer in 0.1 wt.% water-Cu nanofluid, nevertheless independent of concentration, distinctly higher heat transfer coefficient was recorded for stainless steel tube than for copper tube for the same heat flux density.
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机译：已经对两种纳米流体，即水-Al 2 O 3和水-Cu的池沸腾过程中的热传递进行了实验研究。以0.01重量％，0.1重量％和1重量％的浓度测试纳米颗粒。具有10mm外径和0.6mm壁厚的水平光滑铜和不锈钢管形成测试加热器。已经进行了实验以建立纳米流体浓度以及管表面材料对大气压下传热特性的影响。结果表明，当水-Al2O3或水-铜纳米流体在光滑的铜管上沸腾时，独立于浓度的纳米颗粒材料（Al2O3和Cu）几乎对传热系数没有影响。看起来加热器材料在0.1 wt。％的水-铜纳米流体中并没有影响沸腾的热传递，但是与浓度无关，在相同的热通量密度下，不锈钢管的传热系数明显高于铜管。
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