Change search
ReferencesLink to record
Permanent link

Direct link
Details of experiments performed on rotating duct flow
KTH, Superseded Departments, Mechanics.
2004 (English)Report (Other academic)
Place, publisher, year, edition, pages
URN: urn:nbn:se:kth:diva-5622OAI: diva2:10050
Internal report, Department ofMechanics, KTH, Stockholm, Sweden. QC 20100913Available from: 2006-04-27 Created: 2006-04-27 Last updated: 2010-09-13Bibliographically approved
In thesis
1. Analysis of laminar and turbulent flows with turbomachinery, biotechnology and biomechanical applications
Open this publication in new window or tab >>Analysis of laminar and turbulent flows with turbomachinery, biotechnology and biomechanical applications
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The goal of this study was initially to gain a better understanding of the effects of rotation on turbulent flow in ducts. Knowledge concerning the influence of rotation on the structures of turbulence is of fundamental importance in many applications, e.g. centrifugal separators, turbines or cooling channels in rotating machinery, as well as meteorology and oceanography. Rapidly rotating duct flow is studied experimentally with rotation numbers in the interval [ 0, 1] . To achieve this, in combination with relatively high Reynolds numbers (5000 – 30000 based on the hydraulic radius), water was used as the working medium. The influence of the rotation on the pressure drop in the duct was investigated and suitable scalings of this quantity were studied. Due to questions that arose in the experimental study, two numerical studies were initiated. The first study probed the effect of rotation and geometrical configuration on the development length for turbulent flow, while the second comprised a direct numerical simulation of turbulent flow in a rotating duct. It is shown that while system rotation does not have a marked effect on the development length in a plane channel, the development length is substantially shortened in a duct.

Additional systems subject to rotation or curvature effects were studied. The laminar flow of fluid in a rotating PCR-cone was analysed analytically and numerically to understand the increased mixing and temperature homogenization. The flow field in the cone was described and the increased mixing was due to a strong boundary layer flow incited by Coriolis and buoyancy effects. Comparisons of the numerical simulations with experiments yielded good results.

A study to quantify the flow of blood in cerebral malformations using three-dimensional videodensitometry was performed. Data from experiments with an idealized flow phantom, as well clinical pathologies, showed that the proposed methodology in conjunction with clinical injection protocols can yield mean flux data with an error less than 20%. Protocol improvements are proposed.

Place, publisher, year, edition, pages
Stockholm: Mekanik, 2006
Trita-MEK, ISSN 0348-467X ; 2006:06
National Category
Fluid Mechanics and Acoustics
urn:nbn:se:kth:diva-3928 (URN)
Public defence
2006-05-05, Sal F2, Lindstedtsvägen 28, Stockholm, 13:30
Available from: 2006-04-27 Created: 2006-04-27 Last updated: 2012-03-21

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Mårtensson, Gustaf
By organisation

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 24 hits
ReferencesLink to record
Permanent link

Direct link