Combined Convection Heat Transfer In A Trapezoidal Enclosure With A Revolving Inner Cylinder For ???????????? − ???????? − ????????????????????Hybrid Nanofluid

Abstract

A numerical analysis was executed using the Ansys program (ANSYS Fluent 2021 R2) to examine combined convection throughout a trapezoidal enclosure including a rotating cylinder as a source of heat. In this work, two different fluids were used: water and a hybrid nanofluid comprising water and Water − Cu − Al₂O₃. Along with the angled walls being insulated, the top and lower walls remain cold and stationary. Validation and comparison of the current study with earlier published studies have disclosed a substantial degree of agreement, with a mean relative disparity of about 1.9%. The results include a total of four internal cylinder places (center, right, top, and bottom), four tilted angles (0°, 45°, 90°, and 180°), and three different Richardson numbers (0.01, 1, and 10). The radius ratios are (0.20, 0.25). It is shown that the ideal location exhibiting the highest average Nusselt value throughout each angle (???? = 0°, 45°, and 90°) is at the bottom (0, −0.12). The greatest rate of Heat transmission happens when the angle is (???? = 180°) and the location is at the top (0, 0.12).