Fluid Mechanics & Aerodynamics

Fluid Mechanics & Aerodynamics

Experimental investigation and presentation of superior models in forecasting of dynamic viscosity of MWCNT-ZnO nanofluid using response surface method (RSM

Document Type : Original Article

Authors
Majid Jalilian 1
Mohammad Hemmat Esfe 2
1 Master's degree, Imam Hossein University, Tehran, Iran
2 Associate Professor, Imam Hossein University, Tehran, Iran
Abstract
In this study, the dynamic viscosity of the hybrid nanofluid, including ZnO-MWCNT nanoparticles with a ratio of (20%-80%) on the 40w10 oil base fluid in the range of 5 oC to 55 oC and six volume fractions in the range of 0.05 to 1% and a shear of to 11997s-1 is investigated. With the help of response surface analysis method (RSM), different models are investigated. In this comparison, analysis of important parameters of different models including R², Adjusted R, Predicted R², CV%, Std. Dev are studied. The results showed that the fourth order model has the best performance among different models and its important values are R2=0.9993, Adjusted R²=0.9994, Predicted R²=0.9991, Cv%=2.46 and Std. Dev. =4.57 respectively. Also, the trend of viscosity changes is investigated. The results showed that temperature has the greatest effect on viscosity. Also, in order to reduce costs and save time, the optimal relationship for predicting the dynamic viscosity is presented.
Keywords
Hybrid nanofluid
Experimental investigation Multiwall carbon zinc oxide
Response surface method
Dynamic viscosity

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Fluid Mechanics & Aerodynamics
Volume 14, Issue 1 - Serial Number 35
Spring and summer
September 2025
Pages 143-158

  • Receive Date 06 June 2025
  • Revise Date 30 July 2025
  • Accept Date 11 August 2025
  • Publish Date 23 August 2025