Validation Test of Parallelized Codes in the Study of Flow and Heat Transfer Anomalous Enhancement in a Single Inclined Groove on a Plate

A validation test is presented based on the study of the phenomenon of separated turbulent air flow and anomalous enhancement of heat transfer in an inclined groove on a heated plate. The groove is made up of two halves of a spherical dimple with a spot diameter of 0.25, and it is connected by a trench insert that is 5 long. The generation of tornadoes in grooves associated with extraordinary static pressure differences contributes to the formation of fields of ultra-high velocities, high gradients of relative friction, and heat transfer coefficients inside the inclined groove. Databases of heat flux measurements in a groove on the isothermal section of the plate when varying the inclination angle from 0° to 90° were obtained on the SPbPU thermophysical setup. Parametric numerical and physical studies of heat transfer on a plate with a single groove were performed at Re = 3×104. Using the parallelized package VP2/3 has resulted in a satisfactory agreement between experimental data and numerical predictions made within the RANS-SST framework. Abnormal heat transfer enhancement in grooves occurs at angles of inclination from 30° to 75°, which correlates with conclusions on analysis of pressure distributions in grooves on the plate. The vortex structure in the groove on the plate at an inclination angle of 45° is illustrated. It is shown that the focused pressure difference between the adjacent stagnation zone on the windward slope and the reduced pressure region at the entrance to the groove initiates a tornado-like vortex and the developing intense swirling flow.