3D numerical study of Al2O3-water nanofluid unsteady natural convection via using oscillating plate by two-way FSI analysis
摘要
The heat transfer enhancement under natural convection in the cavity has been studied as one of the prominent research projects with some scholars. In the present study, an Oscillating plate is placed in different locations on the top of the cavity to investigate its effect on heat transfer performance. The width and length of the cavity defined as 100 mm in 100 mm, respectively. The assumed boundary conditions of the cavity are considered as constant heat flux equals to 6382 W m−2 on the right side and constant temperature equals to 0 °C on the left side, while the other sides are assumed to be at zero heat flux. Nine different cases are considered in this study. In three cases, the location of Oscillating plate is changed from left side, with distances of 25 mm from each other. The effect of constant heat flux on the right side and constant temperature on the left side on local heat transfer coefficient and its analysis using 3D numerical study in the two-way FSI analysis and FVM method is investigated. The results show that the heat transfer coefficient becomes higher when the Oscillating plate is being close to the right side of the cavity. Moreover, in order to investigate the effect of the Oscillating plate width on heat transfer coefficient, three cases are considered in which the location of plate is assumed to be fixed and close to the right side of the cavity for different Oscillating plate width equals to 0.4 mm, 0.7 mm, and 1 mm. The analysis reveals an 8% increase in the value of the heat transfer coefficient as the Oscillating plate distance to the right wall of the cavity is 25 mm compared to 75 mm, a 4.24% increase in the heat transfer coefficient when the plate thickness is 0.4 mm compared to 1 mm, and 0.5% escalation in this value as the mass fraction of nanofluid is 0.5 compared to 0.1.