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The preparation of surfactant-free highly dispersed ethylene glycol-based aluminum nitride-carbon nanofluids for heat transfer application
作者 :  Esmaeili, Elaheh; Rounaghi, Seyyed Amin; Gruner, Wolfgang; Eckert, Juergen
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In the present study, aluminum nitride-carbon (AlN-C) nanocomposites are synthesized through a green, facile and inexpensive mechanochemical route. Well-dispersed nanofluids are prepared by milling of nanocomposite in ethylene glycol (EG) without using any surfactants/dispersants. The resulting nanofluids have an excellent stability with no obvious sedimentation for at least three months. The results confirm the in-situ polymerization of EG on AlN surface and the formation of hyperbranched glycerol upon milling which in turn stabilizes the particles through a steric effect. The working nanofluids with very low loadings of up to 0.22 vol% of powder exhibit an enhanced heat transfer coefficient (h) of about 24% compared to that of the base fluid in a laminar flow regime (Re = 160). Brownian motion and boundary layer thinning are known as the main mechanisms, causing for this enhancement.

关 键 词 :  Nanostrucutred aluminum nitride; Ball milling; Convective heat transfer; Laminar flow; Nanofluid; Hyperbranched polyglycerol
论文来源 :  ADVANCED POWDER TECHNOLOGY.2019,30(10):2032-2041
语种 :  英文
所属领域 :  >>> 海洋地质勘查业
入库时间 :  2019-09-16
浏览次数 :  2