Thermal Behavior of Aqueous Cerium Oxide Nano-Suspension under the Pool Boiling Conditions

Bu çalışma, atmosfer basıncı altında yatay bir bakır plaka üzerinde cerium oksit (CeO, ceria) nanosüspansiyonunun havuz kaynama karakteristiklerinin deneysel olarak incelenmesi üzerine gerçekleştirilmiştir. Nano akışkan süspansiyonu iki adım metodu ile hazırlanmıştır ve Na-citrate ilavesi, pH ayarı ve ultrasonik titreşim uygulanarak kararlı hale getirilmiştir. Cerium oksit nano akışkanının havuz kaynama ısı transfer katsayısı üzerine kaynama yüzeyine uygulanan ısı akısının etkisi deneysel olarak incelenmiş ve sonuçlar tartışılmıştır. Deneysel sonuçlar, iş yapan akışkan olarak cerium oksit nano akışkanının kullanılması ile havuz kaynama ısı transfer katsayısının arttığını göstermiştir. Ayrıca elde edilen sonuçlar, de-iyonize su ile karşılaştırıldığında, %0.1 hacimsel konsantrasyona sahip cerium oksit nano akışkanı için kritik ısı akısında %103 artış olduğunu göstermiştir

Havuz Kaynama Şartlarında Su-bazlı Cerium Oksit Nano-süspansiyonunun Termal Davranışı

The present paper focuses on an experimental study of pool boiling characteristics of cerium oxide (CeO, ceria) nano-suspension on a horizontal flat copper surface at atmospheric pressure. The nanofluid suspension is prepared by a two-step method and stabilized using Na-citrate, pH setting and ultrasonic vibration as well. The effect of applied heat flux to the boiling surface on pool boiling heat transfer coefficient (HTC) of cerium oxide nanofluid is experimentally examined and briefly discussed. The results illustrate that the pool boiling HTC increases with using cerium oxide nanofluid as working fluid. Also, the results show that the critical heat flux for cerium oxide nanofluid having 0.1 vol.% nanoparticle concentration improves up to 103% compared with the deionized water

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