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Process Parameters Effect Investigations on Viscosity of Water-ethylene Glycol-based α-alumina Nanofluids: An Ultrasonic Experimental and Statistical Approach
Arabian Journal for Science and Engineering ( IF 2.9 ) Pub Date : 2021-06-08 , DOI: 10.1007/s13369-021-05790-6
R. Prakash , L. Chilambarasan , K. Rajkumar

Stable α-alumina-water-ethylene glycol (WEG) based nanofluids with a low viscosity requirement are preferable for promising engineering applications. Viscosity of nanofluids is a significant parameter that decides the flow characteristics and pumping pressure requirements. In this study, α-alumina nanoparticles (spherical morphology with 40 nm) dispersed in WEG mixture in a ratio of 50:50 (v/v) using an ultra-sonication process. Further analysis of the effects of process parameters on the viscosity of prepared nanofluid, including volume concentrations (0.01%–0.2%), temperatures (30-45 °C), and sonication times (0–4 h). A decrease in viscosity of 11.36% was observed for 0.2% volume concentration as sonication time increased from 0 to 3 h at a process temperature of 45 °C. The viscosity value of nanofluids approaches a stable value at 3 h of sonication. No significant sonication ‘null effect’ was required for lower concentrations irrespective of the temperature and sonication time, yielding low viscosity. At the same time, clusters were observed at a higher volume concentration under a minimal sonication time (1 h) resulting in a higher viscosity. On the other hand, the viscosity of nanofluid was reduced with the help of an increase in sonication duration and process temperature. Statistical analysis ranks a higher degree to volume concentration of nanoparticles.



中文翻译:

工艺参数对水-乙二醇基α-氧化铝纳米流体粘度的影响研究:超声实验和统计方法

具有低粘度要求的稳定的 α-氧化铝-水-乙二醇 (WEG) 纳米流体是有前景的工程应用的首选。纳米流体的粘度是决定流动特性和泵送压力要求的重要参数。在这项研究中,α-氧化铝纳米粒子(40 nm 的球形形态)使用超声波处理以 50:50 (v/v) 的比例分散在 WEG 混合物中。进一步分析工艺参数对制备的纳米流体粘度的影响,包括体积浓度 (0.01%–0.2%)、温度 (30-45 °C) 和超声处理时间 (0–4 h)。在 45 °C 的工艺温度下,随着超声处理时间从 0 小时增加到 3 小时,观察到体积浓度为 0.2% 时粘度降低 11.36%。纳米流体的粘度值在超声处理 3 小时时接近稳定值。无论温度和超声处理时间如何,较低浓度都不需要显着的超声处理“无效效应”,从而产生低粘度。同时,在最短的超声处理时间(1 小时)下,在较高体积浓度下观察到簇,从而导致较高的粘度。另一方面,在超声处理持续时间和工艺温度增加的帮助下,纳米流体的粘度降低。统计分析对纳米颗粒的体积浓度进行了更高程度的排序。在最短的超声处理时间(1 小时)下,在较高的体积浓度下观察到簇,从而导致较高的粘度。另一方面,在超声处理持续时间和工艺温度增加的帮助下,纳米流体的粘度降低。统计分析对纳米颗粒的体积浓度进行了更高程度的排序。在最短的超声处理时间(1 小时)下,在较高的体积浓度下观察到簇,导致较高的粘度。另一方面,在超声处理持续时间和工艺温度增加的帮助下,纳米流体的粘度降低。统计分析对纳米颗粒的体积浓度进行了更高程度的排序。

更新日期:2021-06-08
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