Turbulent pipe flow downstream a 90 degrees pipe bend with and without superimposed swirl
2013 (English)In: International Journal of Heat and Fluid Flow, ISSN 0142-727X, E-ISSN 1879-2278, Vol. 41, 103-111 p.Article in journal (Refereed) Published
In the present work, the turbulent flow downstream a 90 degrees pipe bend is investigated by means of stereoscopic particle image velocimetry. In particular, the three dimensional flow field at the exit of the curved pipe is documented for non-swirling and swirling flow conditions, with the latter being generated through a unique axially rotating pipe flow facility. The non-swirling flow was examined through snapshot proper orthogonal decomposition (POD) with the aim to reveal the unsteady behaviour of the Dean vortices under turbulent flow conditions, the so-called "swirl-switching" phenomenon. In respect to the swirling turbulent pipe flow, covering a wide range of swirl strengths, POD has been employed to study the effect of varying strength of swirl on the Dean vortices as well as the interplay of swirling motion and Dean cells. Furthermore, the visualised large scale structures in turbulent swirling flows through the bend are found to incline and tear up with increasing swirl intensity. The present time-resolved, three component, experimental velocity field data will provide a unique and useful database for future studies; in particular for the CFD community.
Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 41, 103-111 p.
Turbulent flow, Stereoscopic particle image velocimetry, Dean vortices, Curved pipe, Vortex switching, Swirl, Proper orthogonal decomposition
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-124984DOI: 10.1016/j.ijheatfluidflow.2013.01.003ISI: 000321078700011ScopusID: 2-s2.0-84878525295OAI: oai:DiVA.org:kth-124984DiVA: diva2:639085
9th International Symposium on Engineering Turbulence Modelling and Measurements (ETMM), JUN 06-08, 2012, Thessaloniki, Greece
QC 201308062013-08-062013-08-022014-05-23Bibliographically approved