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Author : D. Booth
Publisher :
ISBN 13 :
Total Pages : 53 pages
Book Rating : 4.:/5 (865 download)
Download or read book The Calibration of Hot Wire Anemometers at Low Speed written by D. Booth and published by . This book was released on 1978 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Howard C. Judson (Jr.)
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (115 download)
Download or read book Calibration of the Hot Wire Anemometer at Low Speeds by Photographic Methods written by Howard C. Judson (Jr.) and published by . This book was released on 1949 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : C. F. Cowdrey
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book A Note on the Calibration and Use of a Shielded Hot-wire Anemometer for Very Low Speeds written by C. F. Cowdrey and published by . This book was released on 1947 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Charles G. Lomas
Publisher : Cambridge University Press
ISBN 13 : 0521283183
Total Pages : 225 pages
Book Rating : 4.5/5 (212 download)
Download or read book Fundamentals of Hot Wire Anemometry written by Charles G. Lomas and published by Cambridge University Press. This book was released on 2011-06-09 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 1985 book provides a summary of the theory and practice of the hot wire anemometer, an instrument used to measure the speed of fluid flow. Many techniques and uses of this instrument are discussed in detail. The author considers such topics as probe fouling, probe design, and circuit design, as well as the thermodynamics of heated wires and thin films. He also discusses measurements of turbulence, shear flows, vorticity, temperature, combined temperature and velocity, two-phase flows, and compressible flows for measurements in air, water, mercury, blood, glycerine, oil, luminous gases, and polymer solutions. The book concludes with a section on the pulsed wire anemometer and other wake-sensing anemometers. This book assumes a familiarity with basic fluid mechanics. However, mathematical descriptions occur near the end of each chapter thus allowing those with a limited mathematical background to make use of the practical details at the beginning of each chapter.
Author : Donald Raymond Stonemen
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (427 download)
Download or read book The Calibration of a Hot Wire Anemometer for Use in Low Velocities of Air written by Donald Raymond Stonemen and published by . This book was released on 1948 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Constantin Schosser
Publisher : diplom.de
ISBN 13 : 3836639602
Total Pages : 109 pages
Book Rating : 4.8/5 (366 download)
Download or read book Development of an automated calibration system for hotwire anemometers written by Constantin Schosser and published by diplom.de. This book was released on 2010-01-22 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inhaltsangabe:Introduction: In experimental fluid dynamic measurements hot-wire anemometry is used to record information about flow fields. Furthermore one can obtain the magnitude, the direction and even the time dependant behaviour of the fluid flow, if multiple-wire probes are in operation. The hot-wire measurement technique is based on the convective heat transfer from a heated element to the fluid flow, which is actually proportional to the velocity of the flow. So HWA is an indirect measurement technique. There are miscellaneous sensors which work properly in water or other liquids, air or in gas flows. As an example, Fig. 1.1 shows a cross-wire probe in a fluid flow, which can detect the velocity and its direction in two components, if the main flow direction is in one plane (2D flow). Predominantly HWA is a research tool for turbulent flow studies, especially transient procedures. Turbulence models have to be built to represent the characteristics of the flow in numerical simulations (CFD). Therefore only detailed experimental measurements lead to reliable information about the local velocity of a turbulent flow. This can be provided by HWA on the basis of its very high spatial and temporal resolution. Although the development of HWA started at the beginning of the 19th century and new techniques like PIV or LDA (direct methods) have been established, it is still a common device in all wind tunnel labs. The analogue output signal can be optimized by filters before signal processing. It can also be deployed to arrange a spectrum analysis, due to the high temporal resolution. Moreover, unlike the digital devices the analogue signal is densely packed. The range of application is large and leads from sub- and supersonic flows, the independency of the medium to high-temperature measurements. HWA is also affordable in contrast to LDA and PIV systems. In spite of these advantages the natural contamination of the hot-wire probe increases by and by, since the particles in the fluid flow mature themselves to the probe and finally isolate it. As this effect of disturbance causes measuring errors, the hot-wire probes have to be calibrated at frequent intervals - best before and after every data acquisition series. However, HWA is an intrusive measurement technique, thus disturbing the flow. Another disadvantage is that it is not applicable in separation and backward flow regions. The aim of this thesis is to develop an automated calibration system to [...]
Author : Noor A Ahmed
Publisher : CRC Press
ISBN 13 : 0429805446
Total Pages : 320 pages
Book Rating : 4.4/5 (298 download)
Download or read book Coanda Effect written by Noor A Ahmed and published by CRC Press. This book was released on 2019-08-28 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coanda effect is a complex fluid flow phenomenon enabling the production of vertical take-off/landing aircraft. Other applications range from helicopters to road vehicles, from flow mixing to combustion, from noise reduction to pollution control, from power generation to robot operation, and so forth. Book starts with description of the effect, its history and general formulation of governing equations/simplifications used in different applications. Further, it gives an account of this effect’s lift boosting potential on a wing and in non-flying vehicles including industrial applications. Finally, occurrence of the same in human body and associated adverse medical conditions are explained.
Author : Anthony Edward Perry
Publisher : Oxford University Press, USA
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.3/5 (91 download)
Download or read book Hot-wire Anemometry written by Anthony Edward Perry and published by Oxford University Press, USA. This book was released on 1982 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jun Liu
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (268 download)
Download or read book A Method for Hot Wire Anemometer Calibration in Low Air Velocity written by Jun Liu and published by . This book was released on 1992 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bruno Chanetz
Publisher : Springer Nature
ISBN 13 : 3030355624
Total Pages : 329 pages
Book Rating : 4.0/5 (33 download)
Download or read book Experimental Aerodynamics written by Bruno Chanetz and published by Springer Nature. This book was released on 2020-01-03 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents experimental techniques in the field of aerodynamics, a discipline that is essential in numerous areas, such as the design of aerial and ground vehicles and engines, the production of energy, and understanding the wind resistance of buildings. Aerodynamics is not only concerned with improving the performance and comfort of vehicles, but also with reducing their environmental impact. The book provides updated information on the experimental and technical methods used by aerodynamicists, engineers and researchers. It describes the various types of wind tunnels – from subsonic to hypersonic – as well as the problems posed by their design and operation. The book also focuses on metrology, which has allowed us to gain a detailed understanding of the local properties of flows, and examines current developments toward creating a methodology combining experiments and numerical simulations: the computer-assisted wind tunnel. Lastly, it offers an overview of experimental aerodynamics based on a prospective vision of the discipline, and discusses potential futures challenges. The book can be used as a textbook for graduate courses in aerodynamics, typically offered to students of aerospace and mechanical engineering programs, and as a learning tool for professionals and engineers in the fields of aerodynamics, aeronautics and astronautics automobile.
Author : R. P. Dring
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (696 download)
Download or read book ASME 69-HT-A written by R. P. Dring and published by . This book was released on 1969 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robin Jung Kung
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.:/5 (227 download)
Download or read book Ultra Low-speed Anemometry written by Robin Jung Kung and published by . This book was released on 1967 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of low-speed (0-2 ft/sec) anemometers is presented. First the design, the characteristics and the calibration of a very low-speed micro wind tunnel are described. Then the principle, operation and performance of three different anemometers at these low speeds are discussed. These instruments are: (1) hot-spot anemometer, based on the measurement of the traveling time of a hot cloud, (2) drag anemometer which consists of a small plate mounted to the moving coil mechanism of a micro-ammeter, (3) constant temperature hot-wire anemometer. The comparison of the merits and disadvantages of these instruments shows that in most instances the hot-wire anemometer is superior to the two other anemometers. (Author).
Author : Jih-Chin Fang
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (79 download)
Download or read book Calibration of a Constant-temperature Hot-wire Anemometer for Very Low Reynolds Numbers written by Jih-Chin Fang and published by . This book was released on 1973 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. Hollasch
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (785 download)
Download or read book ASME 71-HT-9 written by K. Hollasch and published by . This book was released on 1971 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cameron Tropea
Publisher : Springer Science & Business Media
ISBN 13 : 3540251413
Total Pages : 1570 pages
Book Rating : 4.5/5 (42 download)
Download or read book Springer Handbook of Experimental Fluid Mechanics written by Cameron Tropea and published by Springer Science & Business Media. This book was released on 2007-10-09 with total page 1570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying DVD-ROM contains ... "all chapters of the Springer Handbook."--Page 3 of cover.
Author : H. H. Bruun
Publisher :
ISBN 13 : 9781383029086
Total Pages : 0 pages
Book Rating : 4.0/5 (29 download)
Download or read book Hot-wire Anemometry written by H. H. Bruun and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive and practical book that examines this very important technique used in fluid flow measurements. As well as the physical experimental set-ups and techniques the book deals with the analysis of the signals gathered from HWA probes.
Author : Ryan Christopher Murphy
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (953 download)
Download or read book Development of an Autonomous Single-Point Calibration for a Constant Voltage Hot-Wire Anemometer written by Ryan Christopher Murphy and published by . This book was released on 2015 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditionally, the measurement of turbulence has been conducted using hot-wire anemometry. This thesis presents the implementation of a constant voltage hot-wire anemometer for use with the Boundary Layer Data System (BLDS). A hot-wire calibration apparatus has been developed that is capable of operation inside a vacuum chamber and flow speeds up to 50 m/s. Hot-wires operated with a constant-voltage anemometer (CVA) were calibrated at absolute static pressures down to 26 kPa. A thermal/electrical model for a hot-wire and the CVA circuit successfully predicted the measured CVA output voltage trend at reduced pressure environments; however, better results were obtained when the Nusselt number was increased. A calibration approach that required only one measured flow speed was developed to allow autonomous calibrations of a CVA hot-wire. The single-point calibration approach was evaluated through comparison with the experimental data from the vacuum chamber over a range of 14-50 m/s and at pressures from 26 to 100 kPa. The thermal-electrical model was used to make predictions of CVA output voltage and the corresponding flow speed for conditions that could not be replicated within a laboratory. The first set of predictions were made for conditions from 7.5 to 100 kPa, at a constant temperature of 250C, within a flight speed range of 40 to 150 m/s. Single-point calibrations were developed from these predictions. Additionally, the thermal-electrical model was used to predict hot-wire response for a change in temperature of 250C at 26 kPa and the single-point calibration developed for the pressure range 7.5 to 100 kPa was tested for its ability to adjust. The temperature variation at a single pressure of 26 kPa proved that the single-point function was capable of adapting to off-standard temperatures with the largest deviations of +/- 7% in the mid-range velocities. With a temperature drop, the deviations were below 5%. The second set of thermal-electrical predictions involved conditions for altitude from 0 to 18 km at flow speeds from 40 to 150 m/s. A single-point calibration was developed for altitude conditions. Furthermore, to test the single-point calibration the thermal-electrical model was used to predict hot-re response for a temperature variation of 250C at 18 km. The single-point calibration developed for altitude proved that it was capable of adjusting to a temperature variation of 250C with maximum deviations of about 5% at mid-range velocities. It is proposed that the single-point calibration approach could be employed for CVA measurements with the Boundary Layer Data System (BLDS) to allow hot-wire data to be acquired autonomously during flight tests.
