Author/Authors :
kahramanoğlu, emre yildiz technical university - faculty of naval architecture and maritime - deparment of naval architecture and marine engineering, Istanbul, Turkey , sezen, savas yildiz technical university - faculty of naval architecture and maritime - deparment of naval architecture and marine engineering, Istanbul, Turkey , bayraktar, seyfettin yildiz technical university - faculty of naval architecture and maritime - deparment of naval architecture and marine engineering, Istanbul, Turkey
Title Of Article :
Computational fluid dynamics analyses on the hydrodynamic entry length in internal flows
Abstract :
In the present numerical study, effects of the shape of the cross-section and their surface roughness on the pipe hydrodynamic entry length have been investigated for various Reynolds (Re) numbers. Standard k-Ɛ turbulence model has been adopted to analyze the turbulent flows in circular, square and equilateral triangle cross-sectional pipes. Analyses indicate that the rough surfaces have the shorter entry lengths than that of the smooth surfaces and increasing surface roughness reduces the entry length regardless of the cross-section of the pipes. The equilateral triangle pipes have the longest while circular cross-sectional pipe has the shortest entry lengths. Re number has the significant effect on the entry length and it is seen that the higher the Re number the longer the entry length.
NaturalLanguageKeyword :
Computational fluid dynamics , Internal flows , Roughness , Turbulent flows , Entrance length
JournalTitle :
Pamukkale University Journal Of Engineering Sciences
