Experimental and computational investigation of velocity field for intermediate region of laminar pulsatile pipe flow

Bu çalışmada, laminar-darbeli boru akışının ara bölgesindeki hız alanı deneysel ve hesaplamalı teknikler kullanılarak incelenmiştir. Öncelikle, bir test bölgesindeki kesitsel hız dağılımının ve statik basınç farkının bir darbe çeviriminin 30 farklı anındaki değişimleri, sırasıyla bir kızgın-tel anemometresi ve bir basınç transdüseri kullanarak 29 farklı çalışma şartını kapsayacak şekilde (2.26x$10^ 3underline +$17%≤Reta≤4.36x$10^ 3underline +$10%, 5.1$underline +$4%≤ $sqrt{omega'}$ ≤28.0$underline +$0.05%, 0.03≤A1≤0.71), ölçülmüştür. Daha sonra, deneysel şartların birbirinden farklı seçilmiş dört tanesi, sonlu-hacim tabanlı Fluent yazılım programı vasıtasıyla, hesaplamalı olarak analiz edilmiştir. Hem hesaplamalı hem de deneysel çalışmaların neticeleri göstermektedir ki; laminar-darbeli boru akışının ara bölgesindeki bütün şartlar için boyutsuz hız profillerinin genel eğilimleri Blasius’un dağılımına çok benzemekte fakat Prandtl’ın dağılımından önemli ölçüde farklılık göstermektedir. Bütün deney şartları için hem deneysel hem de hesaplamalı hız profilleri bir darbe çevriminin bazı fazlarında Blasus’un dağılımından daha küt olmakta fakat kalan fazlarda ondan daha keskin olmaktadır.

Laminar darbeli boru akışının ara bölgesi için hız alanının deneysel ve hesaplamalı olarak incelenmesi

In this study, velocity field in intermediate region of laminar-pulsatile pipe flow is investigated by using experimental and computational techniques. Initially, variations of cross sectional velocity profile and static pressure difference at a test section through 30 different instants of a pulsation cycle are measured respectively by means of a hot-wire anemometer and a pressure transducer for 29 different runs covering the ranges; 2.26x$10^ 3underline +$17%≤Reta≤4.36x$10^ 3underline +$10%, 5.1$underline +$4%≤ $sqrt{omega'}$ ≤28.0$underline +$0.05%, 0.03≤A1≤0.71. Selected four different ones of the experimental runs are then analyzed computationally by using the finite-volume based Fluent software-package. The results of both experimental and computational parts of this study indicate that the general tendencies of dimensionless velocity profiles are very similar to the Blasius’s distribution but differ appreciably from the Prandtl’s distribution for the all runs in intermediate region of laminar-pulsatile pipe flow. Both the experimental and the computational velocity profiles become blunter than the Blasius’s distribution in some phases of the pulsation cycle but become sharper than it in the remaining phases for the all runs.

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