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Showing 1 to 20 of 109 for “"anemometry"”.
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Anemometry tools and procedures for greenhouse experiments
Greenhouses provide a useful environment for conducting plant studies, facilitating manipulation and measurement of many variables in the plant microclimate. Photosynthesis, transpiration, thigmomorphogenic responses, and particle transport all depend on the level of air speed at the …
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Split-film anemometry in a drag-reducing solution
… 0.15 < y/R < 0.3.</p> <p>Accurate hot-film anemometry measurements in fresh polymer solutions were found to be unfeasible because of rapid changes in heat transfer rate caused by minute polymer degradation.</p> <p>Measurements in a degraded polymer solution gave both raised and lowered axial …
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A Study of Constant Voltage Anemometry Frequency Response
<p>The development of the constant voltage anemometer (CVA) for the boundary layer data system (BLDS) has been motivated by a need for the explicit autonomous measurement of velocity fluctuations in the boundary layer. The frequency response of a sensor operated by CVA has been studied analytically …
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Digital signal processing techniques for laser-doppler anemometry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Constant Voltage Hot-Wire Anemometry for the Boundary Layer Data System
<p>To continue the development of the Boundary Layer Data System (BLDS), a constant voltage hot-wire anemometer (CVA) is implemented into the BLDS for flight-testing. The hot-wire anemometer was chosen as an alternative to the traditional pressure probe because of the ability to measure both …
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Measurement of properties of gas-solid suspensions using phase-Doppler anemometry
… and horizontal diameters using Phase Doppler Anemometry which was a nonintrusive technique that measured the size and velocity of particles within the suspension flow. Phase Doppler Anemometry was used to determine flow properties that depended on the density of the particle phase and to …
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Measurement of oil-water flows in deviated pipes using thermal anemometry and optical probes
… into deviated oil-water flows using thermal anemometry and optical probes. Two novel measuring techniques have been designed and tested in a 78mm diameter multiphase flow ioop. The measuring devices are known as the dual probe and the dual split-film probe. The dual probe is a combination of …
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The use of hot-wire anemometry in studying supersonic slot injection into a supersonic flow
Tangential supersonic slot injection (M = 1.7) of air into a supersonic air stream (M = 2.91) was studied with a dual hot wire probe. This probe was used to simultaneously determine total temperature and mass flux. Mean profiles across the entire flow field at three axial stations (x/h = 4, 10, 20) …
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Laser Doppler anemometry measurements of a confined turbulent water jet with a uniform background flow
An axisymmetric, turbulent water jet with several very slow, coflowing external streams was measured with a frequency shifted laser Doppler anemometer. The objective was to approximate a jet submerged in an ambient fluid of infinite domain by using a confined jet in a uniform coflow. The coflow …
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An Experimental Investigation of Thermal Boundary Layer Structure and Heat Transfer in Oscillating Flows Using CARS Spectroscopy and Cold -Wire Anemometry
A conventional, cold-wire technique is used to provide a more detailed description of the time-resolved structure of a thermal boundary layer in the oscillating flow. The cold-wire technique provides for increased data acquisition rates relative to CARS, at the expense of an ambiguous, systematic …
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Experimental determination of the flow field velocity and strain rate in a laminar opposed flow H₂/air diffusion flame, via laser doppler anemometry
An experimental investigation of an opposed flow hydrogen-air diffusion flame was conducted. The purpose was to experimentally determine the flow field velocity and corresponding strain rate under different operating flow conditions. An axisymmetric opposed jet burner was employed in this …
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LDA and CTA in-cylinder measurements of intake-generated turbulence for steady flow around a centrally located valve
… port. A single sensor Constant Temperature Anemometry (CTA) and a one-component Laser Doppler Anemometry (LDA) system were used to measure velocity profiles in the cylinder.;The LDA and CTA data agreed relatively well. Both showed a conical jet after the valve, which impacted the cylinder …
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Point Doppler velocimetry measurements in circular jets
… with capabilities that are similar to hot wire anemometry, but without inserting a probe into the flow. The insertion of a probe into a flow can affect the flow, resulting in inaccurate measurements.;PDV measurements for 1 inch diameter standard, swirling, and annular jets have been made at a …
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Fluid Flow and Performance Characteristics of a Cyclone Separator Operating Under Side Stream Conditions
… has involved flow visualisation, laser Doppler anemometry, computational fluid Dynamics, as well as both model particle tests and full scale prototype tests to quantify the effect of base suction and cyclone performance.<br/><br/>Flow visualisation has highlighted the extension of the vortices …
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Measurements of the structure of urban-type boundary layers
… Measurements were conducted with hot-wire anemometry, Laser Doppler anemometry, and particle image velocimetry. Development of the particle image velocimetry technique to obtain accurate turbulence statistics over and among the roughness elements was successfully undertaken providing …
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