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Calibration Of A Hot Wire Hot Film Anemometer Over A Range Of Temperature Velocities And Pressures
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Book Synopsis Calibration of a Hot-Wire/Hot-Film Anemometer Over a Range of Temperatures, Velocities, and Pressures by : Denise C. Oka
Download or read book Calibration of a Hot-Wire/Hot-Film Anemometer Over a Range of Temperatures, Velocities, and Pressures written by Denise C. Oka and published by . This book was released on 1987 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was made of the possibility of developing a single calibration equation that would be applicable to a wide range of temperatures (68 F to 250 F), velocities (150 to 800 ft/sec), and pressures (15 to 33 psia). A platinum hot film, with a high enough operating temperature to provide good sensitivity to velocity, was calibrated at seven different temperature/pressure conditions. The data was used to calculate velocity, Reynolds number and Nusselt number, and a linear least squares curve fit was applied to the data as a function of Reynolds number raised to an exponent and as a function of Nusselt number times a load factor raised to an exponent. The exponents were chosen, through an iterative process, to provide the best agreement between the data and the curve fit equation. The results indicate that as the range of conditions is allowed to increase ao does the error between measured velocity and velocity derived from the calibration equation.
Book Synopsis Calibration of a Hot-wire/hot-film Anemometer Over a Range of Temperature, Velocities, and Pressures by : Denise C. Oka (CAPT, USAF.)
Download or read book Calibration of a Hot-wire/hot-film Anemometer Over a Range of Temperature, Velocities, and Pressures written by Denise C. Oka (CAPT, USAF.) and published by . This book was released on 1987 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamentals of Hot Wire Anemometry by : Charles G. Lomas
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.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Reports Awareness Circular : TRAC. by :
Download or read book Technical Reports Awareness Circular : TRAC. written by and published by . This book was released on 1988-05 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of an Autonomous Single-Point Calibration for a Constant Voltage Hot-Wire Anemometer by : Ryan Christopher Murphy
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.
Book Synopsis Calibration of Hot-wires and Hot-films for Velocity Fluctuations by : Marvin Francis Young
Download or read book Calibration of Hot-wires and Hot-films for Velocity Fluctuations written by Marvin Francis Young and published by . This book was released on 1976 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of an automated calibration system for hotwire anemometers by : Constantin Schosser
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 [...]
Book Synopsis Bioaerosols Handbook by : Christopher S. Cox
Download or read book Bioaerosols Handbook written by Christopher S. Cox and published by CRC Press. This book was released on 2020-11-25 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive handbook provides up-to-date knowledge and practical advice from established authorities in aerosol science. It covers the principles and practices of bioaerosol sampling, descriptions and comparisons of bioaerosol samplers, calibration methods, and assay techniques, with an emphasis on practicalities, such as which sampler to use and where it should be placed. The text also offers critiques concerning handling the samples to provide representative and meaningful assays for their viability, infectivity, and allergenicity. A wide range of microbes-viz., viruses, bacteria, fungi and pollens, and their fragments-are considered from such perspectives. Bioaerosols Handbook is divided into four parts, providing a wide-ranging reference work, as well as a practical guide on how best to sample and assay bioaerosols using current technology.
Book Synopsis Discharge and Velocity Measurements by : Andreas Mueller
Download or read book Discharge and Velocity Measurements written by Andreas Mueller and published by CRC Press. This book was released on 2021-05-30 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers of the short course on Discharge and Velocity Measurements, Zurich, Aug. 1987 on discharge measurement and calibration, point measures of velocity, measurement of velocity fields, and needed developments.
Book Synopsis Measurement and Instrumentation in Engineering by : Francis S. Tse
Download or read book Measurement and Instrumentation in Engineering written by Francis S. Tse and published by CRC Press. This book was released on 2018-04-27 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a mathematical basis for obtaining valid data, and basic concepts inmeasurement and instrumentation, this authoritative text is ideal for a one-semesterconcurrent or independent lecture/laboratory course.Strengthening students' grasp of the fundamentals with the most thorough, in-depthtreatment available, Measurement and Instrumentation in Engineeringdiscusses in detail basic methods of measurement, interaction between a transducer andits environment, arrangement of components in a system, and system dynamics ...describes current engineering practice and applications in terms of principles andphysical laws .. . enables students to identify and document the sources of noise andloading . .. furnishes basic laboratory experiments in sufficient detail to minimizeinstructional time ... and features more than 850 display equations, over 625 figures,and end-of-chapter problems.This impressive text, written by masters in the field, is the outstanding choice forupper-level undergraduate and beginning graduate-level courses in engineeringmeasurement and instrumentation in universities and four-year technical institutes formost departments.
Book Synopsis Airborne Measurements for Environmental Research by : Manfred Wendisch
Download or read book Airborne Measurements for Environmental Research written by Manfred Wendisch and published by John Wiley & Sons. This book was released on 2013-03-22 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first comprehensive review of airborne measurement principles covers all atmospheric components and surface parameters. It describes the common techniques to characterize aerosol particles and cloud/precipitation elements, while also explaining radiation quantities and pertinent hyperspectral and active remote sensing measurement techniques along the way. As a result, the major principles of operation are introduced and exemplified using specific instruments, treating both classic and emerging measurement techniques. The two editors head an international community of eminent scientists, all of them accepted and experienced specialists in their field, who help readers to understand specific problems related to airborne research, such as immanent uncertainties and limitations. They also provide guidance on the suitability of instruments to measure certain parameters and to select the correct type of device. While primarily intended for climate, geophysical and atmospheric researchers, its relevance to solar system objects makes this work equally appealing to astronomers studying atmospheres of solar system bodies with telescopes and space probes.
Book Synopsis The CRC Handbook of Mechanical Engineering, Second Edition by :
Download or read book The CRC Handbook of Mechanical Engineering, Second Edition written by and published by CRC Press. This book was released on 1998-03-24 with total page 2642 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past 20 years, the field of mechanical engineering has undergone enormous changes. These changes have been driven by many factors, including: the development of computer technology worldwide competition in industry improvements in the flow of information satellite communication real time monitoring increased energy efficiency robotics automatic control increased sensitivity to environmental impacts of human activities advances in design and manufacturing methods These developments have put more stress on mechanical engineering education, making it increasingly difficult to cover all the topics that a professional engineer will need in his or her career. As a result of these developments, there has been a growing need for a handbook that can serve the professional community by providing relevant background and current information in the field of mechanical engineering. The CRC Handbook of Mechanical Engineering serves the needs of the professional engineer as a resource of information into the next century.
Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1982 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Publications by : United States. National Bureau of Standards
Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1978 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Publications of the National Bureau of Standards 1977 Catalog by : United States. National Bureau of Standards
Download or read book Publications of the National Bureau of Standards 1977 Catalog written by United States. National Bureau of Standards and published by . This book was released on 1978 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
