The present work investigates the effect of plate gap on the rheological properties of shear thickening fluid (STF) and proposes a phenomenological model to predict the viscosity curve of STF for different values of plate gap and temperature. Multiwalled carbon nanotube (MWCNT) reinforced silica-based STF (MWCNT/SiO₂-STF) containing 0.8 wt% MWCNT and 20 wt% SiO₂ nanoparticles was prepared using polyethylene glycol as a dispersion medium and tested for its steady and dynamic rheological behavior at different plate gaps. The peak viscosity of MWCNT/SiO₂-STF follows the characteristic behavior of an initial increase followed by a subsequent decrease corresponding to the increase in plate gap. A maximum viscosity of 198.89 Pa s was recorded at a plate gap of 1.0 mm. Although significant shear thinning in the dynamic rheological response of MWCNT/SiO₂-STF was noticed at a 1.0 mm gap, the storage and loss modulus were better than those at 0.5 mm gap. The proposed model based predicts the shear thinning and thickening behavior of STF at low and high shear rates for different values of plate gap with reasonable accuracy. The model also provides a very good fit for the viscosity of STF at different temperatures. Thus, the proposed model is suitable for numerical simulations as well as theoretical analysis in the vibration control field.

本工作研究了板间隙对剪切增稠流体 (STF) 流变学特性的影响，并提出了一种现象学模型来预测不同板间隙和温度值下 STF 的粘度曲线。使用聚乙二醇作为分散介质制备含有 0.8 wt% MWCNT 和 20 wt% SiO ₂纳米颗粒的多壁碳纳米管 (MWCNT) 增强二氧化硅基 STF (MWCNT/SiO ₂ -STF) ，并测试其稳态和动态流变行为不同的板间隙。_{MWCNT/SiO 2}的峰值粘度-STF 遵循初始增加的特征行为，随后随着板间隙的增加而减少。在 1.0 mm 的板间隙处记录到 198.89 Pa·s 的最大粘度。_{尽管 MWCNT/SiO 2} -STF的动态流变学响应在 1.0 mm 间隙处有显着的剪切稀化，但储能和损耗模量优于 0.5 mm 间隙。所提出的模型以合理的精度预测不同板间隙值在低和高剪切速率下 STF 的剪切稀化和增稠行为。该模型还非常适合 STF 在不同温度下的粘度。因此，所提出的模型适用于振动控制领域的数值模拟和理论分析。