[PDF] Top 20 Destabilizing turbulence in pipe flow

... 12, turbulence keeps decaying while a sufficient forcing is applied (black line after the vertical blue ...forcing, turbulence con- tinually decays and will eventually ...Hagen-Poiseuille flow (see ... See full document

... by Pak and Cho [6]. Their experiments showed that the heat transfer coefficient in the volume fraction of 3% is 12% less than the base fluid. However, a dramatic increase in the viscosity can be seen in comparison with ... See full document

... turbulent flow in a thick walled pipe in order to analyze conjugate heat ...the turbulence models and solution options in terms of computational power versus difference ...the pipe axis and ... See full document

... that pipe flow exhibits interesting statistical properties, there are several issues which required further ...studies, turbulence is known to take the form of puffs at the proposed critical ...the ... See full document

... 20 pipe diameter length (Mullin 2011) and propagate at a speed of approximately 0 ...the pipe diameter and the bulk mean velocity) of equilibrium puffs was estimated to be 1750 by Peixinho & Mullin ... See full document

... turbulent pipe and channel flows can be studied similarly to the laminar case, by considering the NS equations linearized around the turbulent mean flow, with the additional complexity that the mean ... See full document

... pulsatile pipe flow, consisting of a mean flow with a superimposed oscillatory component, has also been investigated by several authors (Sarpkaya in 1966 [10], Gerrard in 1971 [11], Nerem et ... See full document

... inlet pipe (also known as the air intake pre- filtration Systems) mainly includes the vortex pipe, the dust and droplet drain valve, the shock absorption bellows, and the assembly pipeline with four parts ... See full document

... In this paper, the computational fluid dynamics software COMSOL was used to simulate the diffusion of the dead-end branch pipes. We used 2D models to build the geometry of the dead-end branch pipe and the main ... See full document

... Y-junction is any another type of joint and has different structures. This junction used to combine and divide flow such as from one inlet for two outlets and two inlets for one outlet. Y-junction, T-junction and ... See full document

... turbulent flow distribution in branch piping ...turbulent flow analyses were performed to evaluate the performance and impact of the turbulence model and the pressure upstream branch pipe ... See full document

... in pipe flow by installing energy promoter at the inner wall to change the turbulence structure in the ...the flow inside the pipeline with a section of energy promoter embedded at the inner ... See full document

... air pipe conveying air fuel mixture, secondary air (swirled) pipe conveying additional air for turbulence and mixing ...air pipe, secondary pipe and tertiary flow ...secondary ... See full document

... For the high flow rate wall- 656 peaked case L2, Figure 7l, where the turbulence level is already high and the void fraction in the 657 pipe centre is low, and the core-peaked void profi[r] ... See full document

... turbulent flow was created by inserting the twisted tapes and triangular fin type inserts into the test pipe creating high rate of turbulence in pipe, which results in increasing heat transfer ... See full document

... the flow, nudging it towards the ...expansion pipe, this is the value of δ for which most results are presented in Sanmiguel- Rojas & Mullin ...the pipe at z = ...the flow remains almost ... See full document

... uniform flow; the flow then relaminarises, and further downstream, the wall shear layers develop and the centreline velocity again ...Puff turbulence is sustained only by continually entraining fresh ... See full document

... of turbulence does not affect the conformation of the data with log-law (column 2) and the estimated values of U x for the two turbulence conditions did not show significant differences at all three ... See full document

... range discovered from the simulations; both are within the same order of magnitude.. Transverse view 3D velocity streamlines in channel entrance. The simulation results showed a maximum [r] ... See full document

... Jet flow, is provided by pressurized air from 12 bar storage tanks through a pressure reducer placed at the inlet of the settling chamber. A converging nozzle is attached at the end of the settling chamber. Jet ... See full document