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Experimental investigation of the relation between yield stress and ultrasonication period of nanofluid

机译：纳米流体屈服应力与超声作用时间关系的实验研究

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摘要

Nanofluids are the mixtures of solid nanoparticles in liquid. Like most other fluids, nanofluids could behave as yield stress fluids, which require a certain amount of stress to flow. This flow characteristic may depend on the preparation of nanofluids. This paper investigates the effect of the ultrasonication periods (used during the nanofluid preparation) on the yield stress. The Al_2O_3 nanoparticle with 0.5 vol.% of solid concentration was added to the distilled water using an ultrasonic horn and applied for different durations from 0 to 5 h. The microstructures of the nanoparticles were observed by transmission electron microscopy. The flow characteristics as the shear stresses at different shear rates (12.23-305.75 s~(-1)) were observed for various temperatures from 10 to 50 ℃. The yield stress, the flow behavior index, and the consistency index were studied using the Herschel-Bulkley Theological model. From this study, non-Newtonian flow characteristic was observed. The yield stress decreased with increasing the fluid temperature. At the start of the ultrasonication, the yield stress decreased rapidly; however, for further ultrasonication, it decreased slowly.
机译：纳米流体是固体纳米颗粒在液体中的混合物。像大多数其他流体一样，纳米流体可能表现为屈服应力流体，需要一定量的应力才能流动。该流动特性可能取决于纳米流体的制备。本文研究了超声处理时间（在纳米流体制备过程中使用）对屈服应力的影响。使用超声变幅杆将具有0.5体积％的固体浓度的Al_2O_3纳米颗粒添加至蒸馏水中，并施加0至5小时的不同持续时间。通过透射电子显微镜观察纳米颗粒的微观结构。在10〜50℃的不同温度下，观察到了不同剪切速率（12.23-305.75 s〜（-1））下的剪切应力流动特性。使用Herschel-Bulkley神学模型研究了屈服应力，流动行为指数和一致性指数。通过该研究，观察到非牛顿流动特性。屈服应力随着流体温度的升高而降低。在超声处理开始时，屈服应力迅速降低。但是，为进一步超声处理，它缓慢下降。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2016年第2期|1169-1174|共6页
  • 作者

    I.M. Mahbubul; R. Saidur; A. Hepbasli; M.A. Amalina;

  • 作者单位

    Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;

    Center of Research Excellence in Renewable Energy (CoRE-RE), King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia;

    Department of Energy Systems Engineering, Faculty of Engineering, Yasar University, 35100 Izmir, Turkey;

    Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nanofluid; Ultrasonication period; Colloidal dispersion; Rheological behavior; Yield stress;

    机译：纳米流体超声处理时间;胶体分散体;流变行为;屈服应力;

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