Flow In Curved Ducts Of Varying Cross Section
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Flow In Curved Ducts Of Varying Cross Section
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Author : Fotis Sotiropoulos
language : en
Publisher:
Release Date : 1992
Flow In Curved Ducts Of Varying Cross Section written by Fotis Sotiropoulos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Laminar flow categories.
Developing Flow And Heat Transfer In Strongly Curved Ducts Of Rectangular Cross Section
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Author :
language : en
Publisher:
Release Date : 1979
Developing Flow And Heat Transfer In Strongly Curved Ducts Of Rectangular Cross Section written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
A numerical study of heat transfer in 90°, constant cross-section curved duct, steady, laminar flow is presented. The work is aimed primarily at characterizing the effects of duct geometry on heat transfer by considering, especially, the role of secondary motions during the developing period of the flow. However, due consideration has also been given to varying initial conditions of velocity and temperature at the entrance section to the duct. In addition, an assessment is made of the relative contributions of individual duct walls to heat transfer in the flow. It is found that, in general, heat transfer increases with Dean number with the largest transfer rates occurring through the duct side walls and outer-curvature wall. Duct geometries with aspect ratio greater or smaller than unity have weaker secondary motions and are less effective for heat transfer. Similarly, plug-flow entrance profiles for velocity retard the development of cross-section flow thus inhibiting a significant contribution to heat transfer. It is concluded that short ducts with strong curvature and intense secondary motions can be as effective for heat transfer as longer ducts which are less strongly curved. Calcuations are based on fully elliptic (in space) forms of the transport equation governing the flow. They are of engineering value and are limited in accuracy only by the degree of computational mesh refinement. A comparison with calculations based on parabolic equations has been made and it is shown how the latter can lead to erroneous results for strongly curved flows.
On Viscous Flow In Curved Pipes Of Variable Cross Section
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Author : Anne M. Robertson
language : en
Publisher:
Release Date : 1992
On Viscous Flow In Curved Pipes Of Variable Cross Section written by Anne M. Robertson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Flow Through Curved Ducts Of Constant Cross Section S Curve
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Author : C. J. Rowland
language : en
Publisher:
Release Date : 1964
Flow Through Curved Ducts Of Constant Cross Section S Curve written by C. J. Rowland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with categories.
Numerical Study Of Turbulent Secondary Flows In Curved Ducts
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-09
Numerical Study Of Turbulent Secondary Flows In Curved Ducts written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-09 with categories.
The pressure driven, fully-developed turbulent flow of an incompressible viscous fluid in curved ducts of square cross-section is studied numerically by making use of a finite volume method. A nonlinear Kappa - Iota model is used to represent the turbulence. The results for both straight and curved ducts are presented. For the case of fully-developed turbulent flow in straight ducts, the secondary flow is characterized by an eight-vortex structure for which the computed flowfield is shown to be in good agreement with available experimental data. The introduction of moderate curvature is shown to cause a substantial increase in the strength of the secondary flow and to change the secondary flow pattern to either a double-vortex or a four-vortex configuration. Hur, N. and Thangam, S. and Speziale, C. G. Unspecified Center NAS1-18605; RTOP 505-90-21-01...
Prediction Of Laminar And Turbulent Primary And Secondary Flows In Strongly Curved Ducts
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Author : J. P. Kreskovsky
language : en
Publisher:
Release Date : 1981
Prediction Of Laminar And Turbulent Primary And Secondary Flows In Strongly Curved Ducts written by J. P. Kreskovsky and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Air ducts categories.
Numerical Simulation Of 3 Dimensional Flow In Straight And Curved Ducts Of Rectangular Cross Section
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Author : Bo Gervang
language : en
Publisher:
Release Date : 1989
Numerical Simulation Of 3 Dimensional Flow In Straight And Curved Ducts Of Rectangular Cross Section written by Bo Gervang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
Computation Of Laminar And Turbulent Flow In Curved Ducts Channels And Pipes Using The Navier Stokes Equations
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Author : R. C. Buggeln
language : en
Publisher:
Release Date : 1980
Computation Of Laminar And Turbulent Flow In Curved Ducts Channels And Pipes Using The Navier Stokes Equations written by R. C. Buggeln and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Laminar flow categories.
Both laminar and turbulent flows in strongly curved ducts, channels, and pipes are studied by numerical methods. The study concentrates on the curved square-duct geometry and flow conditions for which detailed measurements have been obtained recently by Taylor, Whitelaw, and Yianneskis. The solution methodology encompasses solution of the compressible ensemble-averaged Navier-Stokes equations at low Mach number using a split linearized block implicit (LBI) scheme, and rapid convergence on the order of 80 noniterative time steps is obtained. The treatment of turbulent flows includes resolution of the viscous sublayer region. A series of solutions for both laminar and turbulent flow and for both two- and three-dimensional geometries of the same curvature are presented. The accuracy of these solutions is explored by mesh refinement and by comparison with experiment. In summary, good qualitative and reasonable quantitative agreement between solution and experiment is obtained. Collectively, this sequence of results serves to clarify the physical structure of these flows and hence how grid selection procedures might be adjusted to improve the numerical accuracy and experimental agreement. For a three-dimensional flow of considerable complexity, the relatively good agreement with experiment obtained for the turbulent flow case despite a coarse grid must be regarded as encouraging. (Author).
Investigation Of Developing Laminar And Turbulent Flow In Curved Ducts
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Author : Michel Philippe Arnal
language : en
Publisher:
Release Date : 1988
Investigation Of Developing Laminar And Turbulent Flow In Curved Ducts written by Michel Philippe Arnal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Computation Of Three Dimensional Flows In Ducts Of Varying Cross Sections
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Author : Suhas V. Patankar
language : en
Publisher:
Release Date : 1983
Computation Of Three Dimensional Flows In Ducts Of Varying Cross Sections written by Suhas V. Patankar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
A calculation procedure is developed for the three-dimensional flow in ducts of varying cross section. The procedure is of the fully parabolic variety; i.e., the solution for the whole duct is obtained by a marching scheme that proceeds from the upstream end to the downstream region solving the flow over one cross section at each marching step. The procedure for each cross section is based on the finite element method of Baliga and Patankar. The report describes a major improvement incorporated in the method and some examples of the use of the method. The adaptation of the method for a marching procedure for duct flows is also described. Among the examples presented as test problems are the developing flows: in a square duct, over a rod bundle, in a square diffuser, and in an elliptic duct of varying cross-sectional shape. All numerical solutions are shown to be in satisfactory agreement with exact solutions and/or other available solutions and experimental data. (Author).
