construction of a hot wire anemometer with linear scale and negligible lag. by M. Ziegler

Cover of: construction of a hot wire anemometer with linear scale and negligible lag. | M. Ziegler

Published by Noord-Hollandsche Uitg.-Mij. in Amsterdam .

Written in English

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  • Anemometer.

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SeriesVerhandelingen der Koninklijke Akademie van Wetenschappen te Amsterdam. Afdeeling Natuurkunde, 1. sect.,, deel 15 no. 1, Mededeeling no. 29 van het Laboratorium voor Aero- en Hydrodynamica der Technische Hoogeschool te Delft.
LC ClassificationsQ57 .A532 deel 15, no. 1
The Physical Object
Pagination22 p.
Number of Pages22
ID Numbers
Open LibraryOL197252M
LC Control Numbera 50004981

Download construction of a hot wire anemometer with linear scale and negligible lag.

The construction of a hot wire anemometer with linear scale and negligible lag (Verhandelingen der Koninklijke Akademie van Wetenschappen te Amsterdam.

Afdeeling Natuurkunde, 1. sect) [M Ziegler] on *FREE* shipping on qualifying offers. Constant temperature operation of the hot‐wire anemometer offers advantages in the study of large velocity fluctuations, of frequency as high as 30, cycles per second.

To avoid spontaneous oscillations in this type of instrument a carefully designed bridge and amplifier are necessary.

Such a design, treating the whole instrument as a feed‐back amplifier, is presented, and Cited by: constant-temperature hot-wire anemometer that i s based on a bridge circuit a llows f or the use of a te mperature compensation se nsor of any resistance.

Ziegler: The construction of a hot wire anemometer with linear scale and negligible lag, Verh. Akad. Wet. 15, 3–22 () Google Scholar J.R.

Weske: A hot-wire circuit with very small time lag, NACA Tech. Rep. () Google Scholar. Anemometer theoretical responses to a wind (w, red) with average speed v_A = m/s and a square fluctuation of amplitude v_F = m/s for two settings of the parameters P and I.

(a) The. Part of the information presented here was obtain- ed from the ASHRAE Guide and Data Book (Fundamentals and Equip- ment,pp. Hot wire anemometer. This instrument is the most re- liable and precise for measurements of velocities in the range from 1, to 60, fpm.

wire fluid strain gage displacement meter velocity consists loading tube feedback tion versus circuits see sec equations torque loop generating linear amplitude electrical static inputs see fig experiments thermal FIGURES Figure Page 1 Commercial configurations of hot wire and hot film anemometers 9 2 Schematic of constant current system 10 3 Schematic of constant temperature system 12 4 General sensor configuration 22 5 Model test sensor block 30 6 Model test hydraulic apparatus 32 7 Experimental instrumentation for model flow tests 33 8 Thermal wave velocity versus mean velocity for the sensor.

In his book, Fluid Dynamics of Drag, Hoerner presents a series construction of a hot wire anemometer with linear scale and negligible lag.

book wing tip shapes which had been previously tested in Germany and documented in the USA by Hoerner, Fig. tests were carried out in a low speed wind tunnel on model-scale wings of relatively low aspect ratio fitted with different tip by: If the time constant is to be tested (important primarily for research applications), it should be done m the aspirator at the normal operating flow rate.

The aspirator should provide a flow by the sensor of about 5 m/s The flow can be checked with a pitot tube or hot wire anemometer. The whole process can then be repeated with another value of q and the results compared and averaged if needed.

Fig. a, b, c shows an example of hot wire anemometer wind data at 2 kHz in the atmosphere yielding the parameters a ≈±, C1 =± (for the energy flux e; see fig.

for a sample of the wind component data). Element count reduction of a thermo-resistive hot-wire anemometer R.

Adamec Proc. SPIESmart Structures, Devices, and Systems IV, R (30 December ); doi: / The wire/ film is heated by passing a current through it.

This heat gets transported by convection and turbulent dispersion. The flow characteristics get captured altered the change is captured by the constant temperature or constant current anemometer. Fig. 3 (a) shows a typical hot wire held between gold-plated prongs connected to a holder Cited by: 4.

Full text of "DTIC ADA Fire Research Abstracts and Reviews. Vol Numbers " See other formats. the sensing anemometer will experience a different wind speed from that experienced by the blades.

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anemometer An instrument used to measure the speed of a gas such as air. It comprises cups or vanes that rotate freely and are linked to a tachometer. Hot-wire anemometers feature a heated wire over which the gas or air passes. Since the electrical resistance of certain metals such as tungsten is dependent on temperature, the cooling effect of.

Current, voltage drop and surface temperature of wire for a particular application.s FIND: Air velocity SCHEMATIC: ASSUMPTIONS: (1) Steady-state conditions, (2) Negligible heat transfer from the wire by atural convection or radiation.n ANALYSIS: If all of the electric energy is transferred by convection to the air, the following equality must.

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In an EEI you would have to look at resistivity, temperature coefficients of resistance and why - at an atomic level - resistance changes. Measure this temperature with a bare-wire junction thermocouple with wires that are ( ±) mm diameter, or with another suitable instrument that has equivalent performance.

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