Diffusion from a Periodically Heated Line-Source Segment and Its Application to Measurements in Turbulent Flows PDF Download
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Author: Roald A. Wigeland Publisher: ISBN: Category : Languages : en Pages : 109
Book Description
A heat tracer technique for determination of mean streak lines and average convection velocities over long distances in turbulent flow fields is developed. The system is made up of a periodically heated line-source segment, a temperature sensing cold-wire probe, and associated signal processing equipment. Cross-correlations between the heating signal and the cold-wire output enhance resolution and permit mean velocity measurements. To evaluate the size of the thermal wake at different downstream locations and to determine the decay rate of the wake centerline temperature, a study of the diffusion of heat from the line-source segment was performed in three test flow conditions with different free-stream turbulence intensities.
Author: Roald A. Wigeland Publisher: ISBN: Category : Languages : en Pages : 109
Book Description
A heat tracer technique for determination of mean streak lines and average convection velocities over long distances in turbulent flow fields is developed. The system is made up of a periodically heated line-source segment, a temperature sensing cold-wire probe, and associated signal processing equipment. Cross-correlations between the heating signal and the cold-wire output enhance resolution and permit mean velocity measurements. To evaluate the size of the thermal wake at different downstream locations and to determine the decay rate of the wake centerline temperature, a study of the diffusion of heat from the line-source segment was performed in three test flow conditions with different free-stream turbulence intensities.
Author: S. Murthy Publisher: Springer Science & Business Media ISBN: 1461587387 Category : Science Languages : en Pages : 469
Book Description
Turbulence, mixing and the mutual interaction of turbulence and chemistry continue to remain perplexing and impregnable in the fron tiers of fluid mechanics. The past ten years have brought enormous advances in computers and computational techniques on the one hand and in measurements and data processing on the other. The impact of such capabilities has led to a revolution both in the understanding of the structure of turbulence as well as in the predictive methods for application in technology. The early ideas on turbulence being an array of complicated phenomena and having some form of reasonably strong coherent struc ture have become well substantiated in recent experimental work. We are still at the very beginning of understanding all of the aspects of such coherence and of the possibilities of incorporating such structure into the analytical models for even those cases where the thin shear layer approximation may be valid. Nevertheless a distinguished body of "eddy chasers" has come into existence. The structure of mixing layers which has been studied for some years in terms of correlations and spectral analysis is also getting better understood. Both probability concepts such as intermittency and conditional sampling as well as the concept of large scale structure and the associated strain seem to indicate possibilities of distinguishing and synthesizing 'engulfment' and molecular mixing.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
An experimental and analytical study has been made of some features of the turbulent heat diffusion behind a line heated wire stretched perpendicular to a flowing isotropic turbulence. The mean temperature distributions have been measured with systematic variations in wind speed, size of turbulence-producing grid, and downstream location of heat source. The nature of the temperature fluctuation field has been studied. A comparison of Lagrangian and Eulerian analyses for diffusion in a nondecaying turbulence yields an expression for turbulent-heat-transfer coefficient in terms of turbulence velocity and a Lagrangian "scale". The ratio of Eulerian to Lagrangian microscale has been determined theoretic ally by generalization of a result of Heisenberg and, with arbitrary constants taken from independent sources, shows rough agreement with experimental results. A convenient form has been deduced for the criterion of interchangeability of instantaneous space and time derivatives in a flowing turbulence.
Author: S. N. B. Murthy Publisher: ISBN: Category : Technology & Engineering Languages : en Pages : 596
Book Description
Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Author: Wade H. Shafer Publisher: Springer ISBN: 9780306341199 Category : Science Languages : en Pages : 312
Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis, (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity was transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 19 (thesis year 1974) a total of 10,045 theses titles from 20 Canadian and 209 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 19 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.
Author: Roald A. Wigeland
Author: Roald A. Wigeland
Author: Roald Arnold Wigeland
Author: S. Murthy
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Author: S. N. B. Murthy
Author: Wade H. Shafer
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