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Title: Υπολογιστική μελέτη της δευτερεύουσας ροής σε ελικοειδή τετραγωνικό αγωγό
Other Titles: A numerical study of the secondary flow in a helical squared duct
Authors: Αθανασόπουλος, Κωνσταντίνος
Keywords: Δευτερεύουσα ροή
Ελικοειδής αγωγός
Υπολογιστική ρευστομηχανική
Keywords (translated): Secondary flow
Helical duct
Abstract: Οι ελικοειδείς αγωγοί χρησιμοποιούνται σε εφαρμογές μεταφοράς θερμότητας.Στην συγκεκριμένη εργασία μελετήθηκε η δευτερεύουσα ροή ,με σκοπό να καθοριστούν οι παράγοντες οι οποίοι συμβάλλουν στην ανάπτυξη των ροών αυτών
Abstract (translated): Curved ducts are widely used in industry, mainly in applications where heat transfer takes place. Due to the curvature of the ducts and the centrifugal forces resulting from this, secondary flows are developed which increase the heat transfer coefficient. This phenomenon occurs in applications with relatively low Dean and Reynolds numbers. It is therefore of great importance to specify the parameters that must be observed in order for a secondary flow to occur. In this thesis, an attempt was made to investigate how the curvature of the duct contributes to this. For laminar flow with Dn = 125 and Re = 485, a square cross-section helical duct of two full rotations and radius of curvature R c = 19,177cm at various pitches was examined. Also fluid velocities perpendicular to the cross section, transverse fluid velocities in the cross-section were examined, and the development of secondary flows in these cross-sections were visualized. The same duct was then examined again,this time reducing by half the radius of curvature R c =9,5885 cm for laminar flow with Dn=125 and Re=345 , Dn=175 and Re=475. Τhe creation of the geometry as well as the results simulation were made possible with the use of the cfd software OpenFoam.
Appears in Collections:Τμήμα Μηχανολόγων και Αεροναυπηγών Μηχανικ. (ΔΕ)

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