SURFACE OF BODY FOR REDUCTION OF FRICTION AND SURFACE OF BODY FOR INTENSIFICATION OF HEAT EXCHANGE Russian patent published in 2011 - IPC F15D1/10 

FIELD: power industry.

SUBSTANCE: on plain surface with or without protective layer there are hollows formed with convex and concave surfaces of the second order, which are conjugated along common tangents; at that, conjugation of hollow with initially plain surface is performed by means of convex surface forming slopes for which in conjugation places the initially plain surface is tangent; at that, concave surface forming the bottom part of hollow is plain or is provided with fairing, and ratio of depth h_c of hollow to dimension L₁ of hollow along flow direction is within 0.001≤h_c/L₁≤0.1; ratio of cross dimension L₂ of hollow to longitudinal dimension L₁ of hollow is within 0.25≤L₂/L₁≤1, at density f of location of hollows on surface which is in the range of 0.05≤f≤0.5. On proposed surface for intensification of mass and heat exchange there are also hollows of the above configuration; at that, 0.1≤h_c/L₁≤0_,5; 0.25≤L₂/L₁≤1; 0.1≤f≤0.8.

EFFECT: reducing aerodynamic resistance of delivery channels and various media.

31 cl, 16 dwg