Download or read book Experimental Investigation of Mechanisms Leading to Transition in Pipe Flow written by Vyomesh Mehta and published by . This book was released on 2012 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of Transition in Oscillating Pipe Flow written by Jörg Seume and published by . This book was released on 1988 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of Laminar turbulent Transition in Flow Through a Rectangular Pipe written by John A. Breslin and published by . This book was released on 1970 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation Into Transitional Pipe Flow written by Kenneth Samuel Breuer and published by . This book was released on 1984 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition to Turbulence in Circular Expansion Pipe Flow written by Kamal Selvam and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis deals with numerical and experimental investigations of flow through circular pipes with smaller inlet and larger outlet diameter, also known as expansion pipes. The hydrodynamic expansion pipe flow is globally stable for high Reynolds number. In order to numerically simulate these types of flows, large computational domains that could accommodate the linearly growing symmetric recirculation region is needed. Moreover, experimental studies of expansion pipe flows indicate that the transition occurs at lower Reynolds number than predicted by the linear stability theory. The reason for early transition is due to the presence of imperfections in the experimental setup, which acts as a finite-amplitude perturbation of the flow. Three-dimensional direct numerical simulations of the Navier-Stokes equations with two different types of perturbations (i) the tilt and (ii) the vortex are investigated. First, the tilt perturbation, which applied at the inlet, creates an asymmetric recirculation region and then breaks to form localised turbulence downstream the expansion section. Second, the vortex perturbation, creates structures that looks like lower order azimuthal mode, resembles an optimally amplified perturbation. It grows due to convective instability mechanism and then breaks to form localised turbulence. Spatial correlation and the proper orthogonal decomposition reveal that this localised turbulence gains it energy from the core flow coming out of the inlet pipe.
Download or read book A Theoretical and Experimental Investigation of the Stability of Pipe Flow with Respect to Three dimensional Disturbances written by Thomas Michael Houlihan and published by . This book was released on 1971 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of the Effect of a Constriction on Turbulent Pipe Flow written by R. C. D. Lissenburg and published by . This book was released on 1974 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laminar to turbulent transition in pipe flow through puffs and slugs written by Mina Nishi and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2009-08 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: A classical problem in fluid mechanics, laminar to turbulent transition in pipe flow, was investigated. Transition in pipe flow was first studied in detail by Reynolds (1883) and continued subsequently by numerous researchers. Nevertheless, there are still number of unknown issues that need clarification. As is well known, two distinct types of flow structure exist during a laminar to turbulent transition in pipes, namely puffs and slugs, termed by Wygnanski (1973). Investigations described in this dissertation were concentrated in the development of puffs and slugs in a pipe at different Reynolds numbers, following some preliminary research works. Also considered is a transformation from puffs to slugs through puff splittings, occurring while they propagate in a pipe or by an increase in Reynolds number. In low Reynolds number pipe flows, a dissipation of puffs was observed and then investigated. The time between when puffs were created and dissipated was termed `full- lifetime' and measured directly by a pressure transient. According to the investigations, possible evolutions of puffs were found and discussed.
Download or read book NBS Special Publication written by and published by . This book was released on 1971 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Internal Flow Structure Transition Through a Tee Junction written by Mamoun F. Abdel-Hafez and published by . This book was released on 1999 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Development Progress Report written by United States. Office of Saline Water and published by . This book was released on 1970 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Bureau of Standards Miscellaneous Publication written by and published by . This book was released on 1966 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vortex induced Waves and the Mechanism of Drop Entrainment in Transition from Stratified to Dispersed Oil water Pipe Flows written by Mohd Izzudin Izzat Bin Zainal Abidin and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents new insights on flow pattern transition from stratified to non-stratified of two-phase oil and water flows in horizontal pipes. A novel approach is implemented to facilitate investigation of drop entrainment which identifies onset of the particular transition, where a cylindrical bluff body is located transverse to flow direction to induce instabilities in the form of vortex-induced interfacial waves in stratified flows. Numerical investigations of two-dimensional single-phase flows performed with CFD code FLUENT shows that vortex shedding frequency increases with decrease in the cylinder diameter while the size of vorticity region expands with increase in cylinder diameter. From the findings, two cylinder diameters, 2 mm and 8 mm are selected for experimental investigation in two-phase flows to generate vortex shedding frequency in the range of 1 to 100 Hz. Findings of high-speed visualization on the flow patterns and interfacial wave characteristics showed that higher instabilities were achieved with increasing cylinder diameter where the transition boundaries were shifted towards lower mixture velocities and waves with higher amplitude were produced. This is attributed to the size of vorticity regions, which are attached to the interface to actuate the vortex-induced waves as demonstrated by the particle image velocimetry (PIV) results. Variations of the vortex shedding behavior achieved by various cylinder diameters were found to be reflected on the resulting vortex-induced waves. The cylindrical bluff body approach is further implemented for the investigations of drop entrainment using a cylinder diameter that corresponds to gap ratio of 0.656 as it provides high instabilities at minimum wall effects. The use of simultaneous PLIF and PIV was introduced to visualize the wave"s evolution with high spatial and temporal resolution while obtaining the velocity field around the waves at the same time. Drop entrainment was identified to occur through detachment of drop from interfacial waves and is formulated into a phenomenological model developed based on force balance. Further analysis of the deformed wave dynamics during drop detachment shows relation to the input flowrate ratio, r.
Download or read book Miscellaneous Publication National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1934 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1975 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydraulic Research in the United States 1970 written by United States. National Bureau of Standards and published by . This book was released on 1971 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
