EP 2103818 B1 20130918 - FRICTION REDUCING SURFACE AND A MASS AND HEAT TRANSFER ENHANCING SURFACE
Title (en)
FRICTION REDUCING SURFACE AND A MASS AND HEAT TRANSFER ENHANCING SURFACE
Title (de)
REIBMINDERUNGSFLÄCHE UND EINE STOFFAUSTAUSCH UND WÄRMEÜBERTRAGUNG VERBESSERNDE FLÄCHE
Title (fr)
SURFACE REDUISANT LE FROTTEMENT ET SURFACE DESTINEE A INTENSIFIER L'ECHANGE MASSIQUE ET THERMIQUE
Publication
Application
Priority
RU 2006000465 W 20060831
Abstract (en)
[origin: EP2103818A1] The present invention relates to aerohydromechanics, power engineering, in-line processing, transport efficiency problems, to medicine and other spheres of scientific-and-technical activities and everyday engineering problems. The disclosed surface for reduction of friction with gaseous and liquid media or with their mixtures is characterized in that recesses (dimples) are made on a smooth surface with or without a protective layer, which are formed by second-order convex and concave surfaces conjugate on common tangents; in so doing, the conjugation of a dimple with initially smooth surface is accomplished using convex surfaces that form slopes, for which the initially smooth surface is tangent at points of conjugation; the concave surface, which forms the bottom part of dimple, is made smooth or with a fairing, the ratio of depth h c of dimple to dimension L 1 of dimple along the direction of flow is in the range 0.001 ‰¤ h c /L 1 ‰¤ 0.1 , and the ratio of transverse dimension L 2 of dimple to longitudinal dimension L 1 of dimple is in the range 0.25 ‰¤ L 2 /L 1 ‰¤ 1 , with the surface density f of dimples being in the range 0.05 ‰¤ f ‰¤ 0.5. Dimples of the configuration described above are made on the disclosed surface for enhancement of heat and mass transfer as well; in so doing, 0.1 ‰¤ h c /L 1 ‰¤ 0.5, 0.25 ‰¤ L 2 /L 1 ‰¤ 1, and 0.1 ‰¤ f ‰¤ 0.8.
IPC 8 full level
F15D 1/02 (2006.01); F15D 1/12 (2006.01); F28F 13/02 (2006.01)
CPC (source: EP)
F15D 1/005 (2013.01); F15D 1/065 (2013.01); F15D 1/12 (2013.01); F28F 13/02 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2103818 A1 20090923; EP 2103818 A4 20100310; EP 2103818 B1 20130918; WO 2008033045 A1 20080320
DOCDB simple family (application)
EP 06847404 A 20060831; RU 2006000465 W 20060831