Download or read book Turbulent Flow and Heat Transfer in Passage Around 180 Degree Bend An Experimental and Numerical Study written by Joseph A. C. Humphrey and published by . This book was released on 1981 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review is presented of the first year of research performed in an investigation aimed at developing a calculation scheme for predicting general three-dimensional flows in curved passages of circular and square cross-section. The experimental component deals with the implementation and validation of a laser-Doppler velocimeter and associated instrumentation. The numerical component deals with the development of a technique for reducing numerical diffusion in the calculation scheme. An update is provided of the current status of the research. A tentative schedule of work for years two and three is also given. (Author).
Download or read book Turbulent Flow in Passage Around a 180 Deg Bend An Experimental and Numerical Study written by Joseph A. C. Humphrey and published by . This book was released on 1983 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser doppler velocimeter measurements for turbulent flow in a 180 degree bend of square cross-section are presented and discussed. These reveal previously undocumented anisotropic features in the flow. Limited data are also provided for the flow in the downstream tangent. Numerical predictions of the flow configurations were made with two types of turbulence models. The two-equation model yields results in broad agreement with the data but fails to reproduce detailed variations present in the flow. It is shown that while the algebraic stress model can resolive these variations, good spatial resolution of the mean flow field is required.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1984 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1981 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Turbulent Flow and Heat Transfer in Noncircular Passages written by Robert G. Deissler and published by . This book was released on 1959 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulent Convecting Flow in a Square Duct with a 180deg Bend written by R. W. Johnson and published by . This book was released on 1984 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research in this British dissertation was motivated by the desire to provide a comprehensive set of convective heat transfer data against which flow simulation schemes could be tested. Turbulent convecting three-dimensional flow of fluids in curved passages is frequently encountered in thermofluids equipment and systems. Although such flow situations have been too complex to adequately simulate computationally in the past, recent developments have provided physical models coupled with numerical techniques which can be applied to provide such simulations. Nevertheless, it has not been established to what extent such simulations provide accurate predictions and a sufficiently detailed data base does not exist to allow a searching evaluation of computer predictions. It is the conclusion of this collaborative study that significant inadequacies remain in the turbulence and wall models with respect to their ability to predict fully-three dimensional curved turbulent flow. Predictions for the Nusselt number distribution are in rather better agreement with the experimental data than are the hydrodynamic and temperature field predictions.
Download or read book ASME Technical Papers written by and published by . This book was released on 2000 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 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 published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Paper written by and published by . This book was released on 1998 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Convective Transport in Flow Around 180 Deg Bend written by B. E. Launder and published by . This book was released on 1983 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the research program are to assess how well current numerical methods and turbulence can combine to predict the detailed flow and heat transfer behaviour in flow around a 180 degree bend, a geometry of great importance in heat exchanger design and in various other cooling-passage geometries. To allow this assessment detailed flow and thermal experimental data are required - and these were not available. The total research program therefore has two roughly equal parts: obtaining the experimental data and developing and applying the three-dimensional numerical calculation scheme.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1987 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 41st AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit 10 13 July 2005 Tucson Arizona 05 4300 05 4349 written by and published by . This book was released on 2005 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Thermophysics and Heat Transfer written by and published by . This book was released on 2006 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt: This journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. It publishes papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include conductive, convective, and radiative modes alone or in combination and the effects of the environment.
Download or read book Energy Research at the University of California 1980 1985 written by University of California (System). Universitywide Energy Research Group and published by . This book was released on 1985 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Winter Annual Meeting written by American Society of Mechanical Engineers and published by . This book was released on with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulent Convecting Flow in a Square Duct with a 180 Degree Bend an Experimental and Numerical Study written by Richard W. Johnson and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Heat Transfer written by and published by . This book was released on 2007 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
