Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur 721302, West Bengal, India.
Department of Mechanical Engineering, Indian Institute of Technology Guwahati 781039, Assam, India.
J Nanosci Nanotechnol. 2021 Jun 1;21(6):3283-3290. doi: 10.1166/jnn.2021.19311.
Hybrid nanofluids, a new class of nanofluid has the ability to further enhance the thermo-physical properties by balancing the benefits of both kinds of nanomaterials as compared with nanofluids synthesized using only one kind of material. In this work, water-based nanofluids containing suspensions of carbon black (CB)-boron nitride (BN) (mass ratio = 50:50) nanoparticles are synthesized and studied for its rheological properties. The viscosity of CB-BN nanofluids are measured at temperatures between 30 °C-60 °C for volume concentrations 0.25 to 2 vol.%. The viscosity shows an increase with increasing particle concentration and decreases with temperature. A non-Newtonian nature with a dilatant behavior in the shear rate range of 5.4 s to 130 s is observed for all concentrations and temperatures. Also, it follows a power law model and its parameters, i.e., power index and consistency index are obtained by the curve fitting method. The non-Newtonian nature intensifies at low temperatures and concentrations. A new correlation is developed to predict the viscosity of CB-BN hybrid nanofluids.
混合纳米流体是一类新型的纳米流体，通过平衡两种纳米材料的优势，具有进一步提高热物理性能的能力，相比仅使用一种材料合成的纳米流体而言。在这项工作中，我们合成了水基纳米流体，其中含有碳黑（CB）-氮化硼（BN）（质量比=50:50）纳米颗粒，并研究了其流变性能。在 30°C-60°C 的温度范围内，测量了体积浓度为 0.25 到 2 体积%的 CB-BN 纳米流体的粘度。粘度随颗粒浓度的增加而增加，随温度的降低而降低。在所有浓度和温度下，观察到具有剪切率范围为 5.4 s 到 130 s 的膨胀行为的非牛顿特性。此外，它遵循幂律模型，通过曲线拟合方法获得其参数，即幂指数和稠度指数。在低温和低浓度下，非牛顿特性会加剧。我们开发了一种新的关联式来预测 CB-BN 混合纳米流体的粘度。
