Abstract

Considering equipment damage, energy consumption enhancement and efficiency reduction during undesirable solidification process, this paper experimentally investigated the ability of clay nanoparticles to hinder the solidification procedure. The nanofluids were prepared by dispersing various concentrations of clay nanoparticles (0.01 wt.%, 0.02 wt.% and 0.04 wt.%) in deionized water without any dispersants. The solidification characteristics of nanofluids were determined by using cooling generator system. The experimental results of clay nanofluids showed a reduction in the nucleation temperature and an enhancement of supercooling degree of about 25% during solidification process due to reduction in heat transport properties. According to the comparison results, it was construed that providing supercooling condition, lower density nanoparticles are more able to advance in nucleation phenomenon and also higher thermal conductivity nanoparticles have more tendency to reduce supercooling degree. Therefore, considering desirable and undesirable solidification, the best possible candidate of nanoparticles can be utilized based on their thermophysical properties.

中文翻译：

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粘土纳米颗粒对阻碍不良固化过程的影响

摘要

考虑到不希望的固化过程中设备损坏，能耗增加和效率降低的影响，本文通过实验研究了粘土纳米颗粒阻碍固化过程的能力。通过将各种浓度的粘土纳米颗粒（0.01重量％，0.02重量％和0.04重量％）分散在去离子水中而没有任何分散剂来制备纳米流体。纳米流体的凝固特性通过使用冷却发生器系统确定。粘土纳米流体的实验结果表明，由于传热性能下降，凝固过程中的成核温度降低，过冷度提高了约25％。根据比较结果，可以认为提供了过冷条件，较低密度的纳米颗粒更易于成核现象，并且较高导热率的纳米颗粒具有降低过冷度的趋势。因此，考虑到期望的和不期望的固化，可以基于纳米粒子的热物理性质来利用其最佳可能的候选者。