均匀和不均匀涂覆氧化铝纳米颗粒对玻璃管加热器池沸腾的影响

Nitin A. Doifode, S. Gajghate, A. Najim, A. Acharya, A. Pise
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引用次数: 2

摘要

实验研究了均匀和不均匀涂覆氧化铝纳米颗粒在普通玻璃管加热器上对池沸腾传热的影响。采用包覆Al2O3纳米颗粒的硼硅酸盐玻璃管作为试验加热器。利用高速摄像机对其沸腾行为进行了研究。池沸腾实验结果表明,与普通玻璃管加热器相比,包覆纳米颗粒表面加热器的传热效果更好。研究了非均匀涂覆纳米颗粒的传热系数,并与均匀涂覆和普通玻璃管进行了比较。纳米粒子在玻璃管表面的包覆效应增加了玻璃管表面的粗糙度,从而产生了更多的成核位点。
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Effect of Uniformly and Nonuniformly Coated Al2O3 Nanoparticles over Glass Tube Heater on Pool Boiling
Effect of uniformly and nonuniformly coated Al2O3 nanoparticles over plain glass tube heater on pool boiling heat transfer was studied experimentally. A borosilicate glass tube coated with Al2O3 nanoparticle was used as test heater. The boiling behaviour was studied by using high speed camera. Result obtained for pool boiling shows enhancement in heat transfer for nanoparticle coated surface heater and compared with plain glass tube heater. Also heat transfer coefficient for nonuniformly coated nanoparticles was studied and compared with uniformly coated and plain glass tube. Coating effect of nanoparticles over glass tube increases its surface roughness and thereby creates more nucleation sites.
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