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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