Boksit/Deiyonize Su Nanoakışkanının Hazırlanması ve Termofiziksel Özelliklerinin Deneysel Olarak İncelenmesi

Bu çalışmada, boksit/deiyonize su nanoakışkanı iki aşamalı yöntem kullanılarak hazırlanmış ve termofiziksel özellikleri deneysel olarak incelenmiştir. Boksit minerali yüksek enerjili spex tipi bilyalı öğütücüde öğütülmüştür. Boksit nanoakışkanı hazırlanırken 38 nm boyutundaki boksit nanopartikülleri (kütlece %2) ve Sodyum Dodesil Benzen Sülfonat (kütlece %0,5) deiyonize suya karıştırılmıştır. Nanopartiküllerin kararlı koloidal dağılımını sağlamak için iki saat boyunca ultrasonikasyon uygulanmıştır. Boksit nanoakışkanının termal karakteristiğinin deiyonize suya göre daha iyi olduğu görülmüştür. Boksit nanoakışkanı, temel akışkana göre daha düşük yüzey gerilimine ve daha küçük temas açısına sahiptir. Ayrıca deiyonize suyla karşılaştırıldığında boksit nanoakışkanının termal iletkenliği ve spesifik ısı kapasitesi sırasıyla %8,47 ve % 4,4 artmıştır.

Preparation of bauxite/deionized water nanofluid and experimental investigation of its thermophysical properties

In this study, bauxite/deionized water nanofluid was prepared by two-step method and its thermopyhsical properties wereexperimentally investigated. Bauxite was milled by high-energy spex type ball milling attritor. Bauxite nanoparticles with a size of38 nm (2% by weight) and Sodium Dodecyl Benzene Sulfonate (0.5% by weight) were doped into the deionized water whilepreparing the bauxite nanofluid. Ultrasonication was applied for two hours to obtain stable colloidal dispersions of nanoparticles.It has been seen that the thermal characteristic of bauxite nanofluid is better than that of deionized water. The bauxite nanofluidhas the lower surface tension and smaller contact angle than that of base fluid. However, the thermal conductivity and the specificheat of bauxite nanofluid increased by 8.47% and 4.4% compared to deionized water, respectively.

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