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首页> 外文会议>International Mechanical Engineering Congress and Exposition >(V08CT09A066)SYNTHESIS AND EXPERIMENTAL INVESTIGATION OF RHEOLOGICAL BEHAVIOR OF EG AND WATER BASED hBN NANOFLUIDS
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(V08CT09A066)SYNTHESIS AND EXPERIMENTAL INVESTIGATION OF RHEOLOGICAL BEHAVIOR OF EG AND WATER BASED hBN NANOFLUIDS

机译：（v08ct09a066）例如水基HBN纳米流体流变行为的合成及实验研究

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Hexagonal boron nitride (hBN) is a ceramic material with high thermal conductivity and superior chemical stability that makes it a suitable candidate for nanofluid synthesis. The studies that focus on hBN nanofluids are mostly limited to hBN-oil dielectric nanofluids. However, using hBN with other base fluids has also significant potential applications. This study focuses on stability and rheological behavior of hBN-water and hBN-ethylene glycol nanofluids that have not been investigated in detail. Nanofluids with hBN nanoparticles of an effective diameter of 70 nm are synthesized using the two-step method. The main problem in this method is sedimentation as a result of disproportionate amount of clustering of nanoparticles within the nanofluids. In the preparation procedure of nanofluids, sonication and pH level control are used. The stability of the hBN-water nanofluids is determined either by quantitative methods such as zeta potential measurements and/or effective particle size measurements via dynamic light scattering, or qualitative methods such as SEM (Scanning Electron Microscopy) and STEM (Scanning Transient Electron Microscopy). Following the investigation of the effect of several parameters, such as sonication time, pH level of the suspension on the stability of the nanofluids, rheologicalbehavior is investigated experimentally. Rheology experiments are conducted with a cone - plate rheometer. In these experiments different volume concentrated (0.5-1%) nanofluids are considered. Validation studies for preparation and characterization methods are carried out with alumina (Al_2O_3), nanofluids which are synthesized by dispersing y-Al_2O_3 nanoparticles of 15 nm into deionized water.
机译：六边形氮化硼（HBN）是具有高导热率和优异的化学稳定性的陶瓷材料，使其成为纳米流体合成的合适候选者。专注于HBN纳米流体的研究主要限于HBN-油介质纳米流体。然而，使用具有其他基础流体的HBN具有显着的潜在应用。本研究侧重于HBN-水和HBN-乙二醇纳米流体的稳定性和流变行为，所述HBN-乙二醇纳米流体尚未详细研究。使用两步法合成具有70nm的HBN纳米颗粒的纳米流体。该方法中的主要问题是由于纳米流体内的纳米颗粒的簇簇的含量不成比例地是沉降。在纳米流体的制备程序中，使用超声处理和pH水平控制。 HBN-水纳米流体的稳定性通过定量方法如Zeta电位测量和/或有效粒度测量通过动态光散射，或诸如SEM（扫描电子显微镜）和阀杆（扫描瞬态电子显微镜）的定性方法。在调查若干参数的效果之后，例如超声处理时间，悬浮液对纳米流体的稳定性的pH水平，实验研究了流风湿。通过锥形流变仪进行流变学实验。在这些实验中，考虑不同体积的浓缩（0.5-1％）纳米流体。用于制备和表征方法的验证研究与氧化铝（Al_2O_3），纳米流体通过将15nm的Y-Al_2O_3纳米颗粒分散到去离子水中而合成。

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