An Experimental And Numerical Investigation Of Flow Past Ribs In A Channel
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An Experimental And Numerical Investigation Of Flow Past Ribs In A Channel
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Author : Edmund Burke Treidler
language : en
Publisher:
Release Date : 1991
An Experimental And Numerical Investigation Of Flow Past Ribs In A Channel written by Edmund Burke Treidler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Experimental And Numerical Investigation Of Flow And Heat Transfer In A Ribbed Square Duct
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Author :
language : en
Publisher:
Release Date : 2007
Experimental And Numerical Investigation Of Flow And Heat Transfer In A Ribbed Square Duct written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
The present contribution describes the methodology and results of an experimental/numerical research program progressing at the von Karman Institute about the investigation of flow and heat transfer in a square section stationary duct equipped with high blockage ribs on one face. This geometry is representative of a high pressure turbine blade cooling channel. The purpose is to highlight the interaction and the synergy between experimental and simulation approaches. The paper shows how the experimental results lead to a conceptual model of the behavior and the topology of this flow. A numerical prediction of the flow over a single rib, obtained from a Large-Eddy Simulation, is able to validate this model, to provide additional information eventually not accessible by the experiments and to put in evidence the underlying structures driving the process. Simulations of a multi-rib domain put in evidence the possible existence of flow structures longer than one rib-pitch length and suggest possible avenues of futures experimental/numerical campaigns to gain a full understanding of this class of flows.
Experimental And Numerical Investigation Of Turbulent Flow And Heat Mass Transfer In A Two Pass Trapezoidal Channel With Turbulence Promoters
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Author : Sung Hyuk Oh
language : en
Publisher:
Release Date : 2010
Experimental And Numerical Investigation Of Turbulent Flow And Heat Mass Transfer In A Two Pass Trapezoidal Channel With Turbulence Promoters written by Sung Hyuk Oh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Experiments and numerical predictions were conducted to study heat (mass) transfer characteristics in a two-pass trapezoidal channel simulating the cooling passage of a gas turbine blade. Three different rib configurations were tested for the air entering the smaller cross section of the trapezoidal channel as well as the larger cross section of the trapezoidal channel at four different Reynolds numbers of 9,400, 16,800, 31,800, and 57,200. (+) 60[degree] ribs, ( -- ) 60[degree] ribs and 60[degree] V-shaped ribs were attached on both the top and bottom walls in parallel sequence. A naphthalene sublimation technique was used, and the heat and mass transfer analogy was applied to convert the mass transfer coefficients to heat transfer coefficients. Numerical predictions of three-dimensional flow and heat transfer also were performed for the trapezoidal channel with and without 90[degree] ribs tested by Lee et al. (2007). Reynolds stress turbulence model (RSM) in the FLUENT CFD code was used to calculate the heat transfer coefficients and flow fields at Re = 31,800. The results showed that the combined effects of the rib angle, rib orientation, and the sharp 180[degree] turn significantly affected the heat (mass) transfer distributions. The secondary flows induced by the sharp 180[degree] turn and the angled or V-shaped ribs played a very prominent role in heat (mass) transfer enhancements. The heat (mass) transfer enhancements and the pressure drops across the turn for 60[degree] V-shaped ribs had the highest values, then came the case of (+) 60[degree] ribs, and the heat (mass) transfer enhancements and the friction factor ratios for ( -- ) 60[degree] ribs was the lowest. However, comparing ( -- ) 60[degree] ribs with the 90[degree] ribs, ( -- ) 60[degree] ribs produced higher heat (mass) transfer enhancements than the 90[degree] ribs, as results of the secondary flow induced by the ( -- ) 60[degree] ribs. The overall average heat (mass) transfer for the larger inlet cases was always higher than that for the smaller inlet cases in the ribbed trapezoidal channel. Considering the thermal performance comparisons of the (+) 60[degree] ribs, the ( -- ) 60[degree] ribs, and 60[degree] V-shaped ribs for the smaller inlet cases, the highest thermal performance was produced by the ( -- ) 60[degree] ribs, and the 60[degree] V-shaped ribs and the (+) 60[degree] ribs had almost the same levels of the thermal performance since the 60[degree] V-shaped ribs produced the highest heat (mass) transfer enhancement but also produced highest pressure drops. For the larger inlet cases, the (+) 60[degree] ribs produced the highest values, then came the case of the 60[degree] V-shaped ribs, and the thermal performance for the ( -- ) 60[degree] ribs was the lowest. The Reynolds stress model (RSM) showed well flow fields and heat transfer distributions but underpredicted average Nusselt number ratios.
Experimental And Numerical Investigation Of Flow Past A Freely Rotatable Square Cylinder
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Author : Tarek G. Zaki
language : en
Publisher:
Release Date : 1991
Experimental And Numerical Investigation Of Flow Past A Freely Rotatable Square Cylinder written by Tarek G. Zaki and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Experimental And Numerical Investigation Of Unsteady Bluff Body Flows
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Author : Raghuram Devarakonda
language : en
Publisher:
Release Date : 1994
Experimental And Numerical Investigation Of Unsteady Bluff Body Flows written by Raghuram Devarakonda and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Numerical Investigation Of The Flow Between A Pair Of Disks Corotating In A Cylindrical Enclosure
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Author : Immaculada Iglesias
language : en
Publisher:
Release Date : 1994
Numerical Investigation Of The Flow Between A Pair Of Disks Corotating In A Cylindrical Enclosure written by Immaculada Iglesias and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
An Experimental And Computational Study Of Flow Instability In A Helical Coil
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Author : Donald Robert Webster
language : en
Publisher:
Release Date : 1994
An Experimental And Computational Study Of Flow Instability In A Helical Coil written by Donald Robert Webster and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Iutam Symposium On Integrated Modeling Of Fully Coupled Fluid Structure Interactions Using Analysis Computations And Experiments
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Author : Haym Benaroya
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Iutam Symposium On Integrated Modeling Of Fully Coupled Fluid Structure Interactions Using Analysis Computations And Experiments written by Haym Benaroya and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
This plenary paper and the accompanying presentation have highlighted field problems involving fluid-structure interaction over a wide span of Navy operations. Considering the vast size and versatility of the Navy's inventory, the cases presented represent examples of a much larger problem. But even this limited set provides sufficient evidence that fluid-structure interaction does hinder the Navy's ability to accomplish its missions. This survey has also established that there are no accurate and generally applicable design tools for addressing these problems. In the majority of cases the state-of-practice is to either make ad-hoc adjustments and estimates based on historical evidence, or conduct expensive focused tests directed at each specific problem and/or candidate solution. Unfortunately, these approaches do not provide insight into the fundamental problem, and neither can be considered reliable regarding their likelihood of success. So the opportunities for applying computational fluid-structure interaction modeling to Navy problems appear limitless. Scenarios range from the "simple" resonant strumming of underwater and in-air cables, to the "self-contained" flow field and vibration of aircraft/ordnance bodies at various Mach numbers, to violent underwater transient detonations and local hull structural collapse. Generally applicable and computationally tractable design-oriented models for these phenomena are of course still far in the future. But the Navy has taken the first steps in that direction by sponsoring specialized numerical models, validation experiments tailored for specific applications, and conferences such as this one.
Gas Turbine Heat Transfer And Cooling Technology Second Edition
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Author : Je-Chin Han
language : en
Publisher: CRC Press
Release Date : 2012-11-27
Gas Turbine Heat Transfer And Cooling Technology Second Edition written by Je-Chin Han and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-27 with Science categories.
A comprehensive reference for engineers and researchers, Gas Turbine Heat Transfer and Cooling Technology, Second Edition has been completely revised and updated to reflect advances in the field made during the past ten years. The second edition retains the format that made the first edition so popular and adds new information mainly based on selected published papers in the open literature. See What’s New in the Second Edition: State-of-the-art cooling technologies such as advanced turbine blade film cooling and internal cooling Modern experimental methods for gas turbine heat transfer and cooling research Advanced computational models for gas turbine heat transfer and cooling performance predictions Suggestions for future research in this critical technology The book discusses the need for turbine cooling, gas turbine heat-transfer problems, and cooling methodology and covers turbine rotor and stator heat-transfer issues, including endwall and blade tip regions under engine conditions, as well as under simulated engine conditions. It then examines turbine rotor and stator blade film cooling and discusses the unsteady high free-stream turbulence effect on simulated cascade airfoils. From here, the book explores impingement cooling, rib-turbulent cooling, pin-fin cooling, and compound and new cooling techniques. It also highlights the effect of rotation on rotor coolant passage heat transfer. Coverage of experimental methods includes heat-transfer and mass-transfer techniques, liquid crystal thermography, optical techniques, as well as flow and thermal measurement techniques. The book concludes with discussions of governing equations and turbulence models and their applications for predicting turbine blade heat transfer and film cooling, and turbine blade internal cooling.
Experimental And Numerical Investigation Into Flow Around Vertical Surface Piercing Cylinder
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Author : Sridhar Yanamandra
language : en
Publisher:
Release Date : 2001
Experimental And Numerical Investigation Into Flow Around Vertical Surface Piercing Cylinder written by Sridhar Yanamandra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.