Noroozi Monir, Zakaria Azmi, Moksin Mohd Maarof, Wahab Zaidan Abd
Department of Physics, University Putra Malaysia, UPM Serdang 43400, Selangor D.E., Malaysia.
Int J Mol Sci. 2012;13(8):10350-10358. doi: 10.3390/ijms130810350. Epub 2012 Aug 20.
The thermal effusivity of Al(2)O(3) and CuO nanofluids in different base fluids, i.e., deionized water, ethylene glycol and olive oil were investigated. The nanofluids, nanoparticles dispersed in base fluids; were prepared by mixing Al(2)O(3), CuO nanopowder and the base fluids using sonication with high-powered pulses to ensure a good uniform dispersion of nanoparticles in the base fluids. The morphology of the particles in the base fluids was investigated by transmission electron microscopy (TEM). In this study, a phase frequency scan of the front pyroelectric configuration technique, with a thermally thick PVDF pyroelectric sensor and sample, was used to measure the thermal effusivity of the prepared nanofluids. The experimental results of the thermal effusivity of the studied solvents (deionized water, ethylene glycol and olive oil) showed good agreement with literature values, and were reduced in the presence of nanoparticles. The thermal effusivity of the nanofluid was found to be particularly sensitive to its base fluid and the type of nanoparticles.
研究了Al₂O₃和CuO纳米流体在不同基液（即去离子水、乙二醇和橄榄油）中的热扩散率。纳米流体是指纳米颗粒分散在基液中，通过使用高功率脉冲超声将Al₂O₃、CuO纳米粉末与基液混合制备而成，以确保纳米颗粒在基液中良好均匀地分散。通过透射电子显微镜（TEM）研究了基液中颗粒的形态。在本研究中，采用具有热厚聚偏氟乙烯（PVDF）热释电传感器和样品的前热释电配置技术的相频扫描来测量所制备纳米流体的热扩散率。所研究溶剂（去离子水、乙二醇和橄榄油）的热扩散率实验结果与文献值吻合良好，并且在存在纳米颗粒时有所降低。发现纳米流体的热扩散率对其基液和纳米颗粒的类型特别敏感。
