Topic
Pipe flow
About: Pipe flow is a research topic. Over the lifetime, 13826 publications have been published within this topic receiving 351605 citations.
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TL;DR: In this article, the relationship between the aperture and gas conductivity of a single natural fracture was investigated in the laboratory and the linear and nonlinear fracture conductivities were determined independently on the basis of both fracture deformation and fracture volume measurements.
Abstract: The relationship between the aperture and gas conductivity of a single natural fracture was investigated in the laboratory. Fracture conductivity was evaluated as a function of both the applied fluid pressure gradient and average fracture aperture, the latter ranging from 600 to 200 μm. Fracture apertures were determined independently on the basis of both fracture deformation and fracture volume measurements. Flow generally occurred in the linear and transitional flow regime between linear and fully nonlinear flow. The transition was found to be smooth and well described by an equation of the form: −(dp/dx) = av + bv2, where dp/dx is the pressure gradient and v is the fluid velocity. The linear and nonlinear fracture conductivities were found to be functions of the aperture and surface roughness of the fracture in agreement with existing empirical equations. A new physical model for fracture flow is also formulated based on an analogy to pipe flow.
124 citations
TL;DR: In this article, a two-phase flow pressure drop analysis by ranging several mass flow rates for a chosen heat flux provided to the minichannel has been performed, and two kinds of upstream conditions have been investigated to show up the confinement influence on boiling.
124 citations
TL;DR: In this article, an experimental study on turbulent pipe flows was conducted with a view to reduce their friction drag by oscillating a section of the pipe in a circumferential direction.
Abstract: An experimental study on turbulent pipe flows was conducted with a view to reduce their friction drag by oscillating a section of the pipe in a circumferential direction. The results indicated that the friction factor of the pipe is reduced by as much as 25% as a result of active manipulation of near-wall turbulence structure by circular-wall oscillation. An increase in the bulk velocity was clearly shown when the pipe was oscillated at a constant head, supporting the measured drag reduction in the present experiment. The percentage reduction in pipe friction was found to be better scaled with the nondimensional velocity of the oscillating wall than with its nondimensional period, confirming a suggestion that the drag reduction seem to be resulted from the realignment of longitudinal vortices into a circumferential direction by the wall oscillation.
124 citations
TL;DR: In this paper, the TERT-IV prototype developed by Tianjin University has been used to measure the parameters of two-phase flow under different flow conditions, and prove that it is possible to monitor on-line the transportation process of air/water twophase flow using ERT system.
124 citations
Book•
01 Jan 1997
TL;DR: The equations of steady one-dimensional compressible flow have been studied in this paper, where the authors introduce the concept of two-dimensional flow hypersonic flow and high temperature flows low density flows.
Abstract: The equations of steady one-dimensional compressible flow some fundamental aspects of compressible flow one-dimensional isentropic flow normal shock waves oblique shock waves expansion waves - Prandtl-Meyer flow variable area flow adiabatic flow with friction flow with heat addition generalized quasi one-dimensional flow numerical analysis of one-dimensional flows aerodynamic heating an introduction to two-dimensional compressible flow hypersonic flow high temperature flows low density flows.
124 citations