Article
Short Communications
2019. V. 57. № 5. P. 771–774
Isaev S.A., Gritckevich M.S., Leont'ev A.I., Popov I.A., Sudakov A.G.
Anomalous intensification of a turbulent separated flow in inclined, single-row, oval-trench dimples on the wall of a narrow channel
Annotation
In a long, plane-parallel channel with single-row, inclined, oval-trench dimples on the wall, a periodic section with a relative length of 8 (the distance between centers of neighboring dimples), a width of 9, a height of 1, and a centrally located, inclined, oval-trench dimple with a length of 7.05, a width of 1.05, a depth of 0.25, and with variation in the inclination angle from 1∘ to 89∘ is considered. An anomalous intensification of a separated turbulent air flow in an inclined dimple at the Reynolds number of 104 is discovered. At an inclination angle of 60∘, the maximum absolute value of negative friction in the middle longitudinal cross-section exceeds the friction in a plane-parallel channel by more than 2.5 times. The cause of this phenomenon is related to the formation of a high pressure drop between the closely located zones of stagnation and low pressure in the semispherical inlet segment of the dimple.
Article reference:
Isaev S.A., Gritckevich M.S., Leont'ev A.I., Popov I.A., Sudakov A.G. Anomalous intensification of a turbulent separated flow in inclined, single-row, oval-trench dimples on the wall of a narrow channel, High Temp., 2019. V. 57. № 5. P. 771
Isaev S.A., Gritckevich M.S., Leont'ev A.I., Popov I.A., Sudakov A.G. Anomalous intensification of a turbulent separated flow in inclined, single-row, oval-trench dimples on the wall of a narrow channel, High Temp., 2019. V. 57. № 5. P. 771