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- 저자 : Lai Zhanwen (검색결과 1 건)
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Plate gap effect on vicosity and rheological model of shear thickening fluid
Hou Shiwei,Lai Zhanwen,Wei Minghai 한국유변학회 2023 Korea-Australia rheology journal Vol.35 No.1
The present work investigates the eff ect of plate gap on the rheological properties of shear thickening fl uid (STF) and proposes a phenomenological model to predict the viscosity curve of STF for diff erent values of plate gap and temperature. Multiwalled carbon nanotube (MWCNT) reinforced silica-based STF (MWCNT/SiO 2 -STF) containing 0.8 wt% MWCNT and 20 wt% SiO 2 nanoparticles was prepared using polyethylene glycol as a dispersion medium and tested for its steady and dynamic rheological behavior at diff erent plate gaps. The peak viscosity of MWCNT/SiO 2 -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 signifi cant shear thinning in the dynamic rheological response of MWCNT/SiO 2 -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 diff erent values of plate gap with reasonable accuracy. The model also provides a very good fi t for the viscosity of STF at diff erent temperatures. Thus, the proposed model is suitable for numerical simulations as well as theoretical analysis in the vibration control field.
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