National Repository of Grey Literature 7 records found  Search took 0.01 seconds. 
Measurement of temperature fluctuations generated by parallel heat sources in a turbulent flow
Antoš, Pavel
Paper deals with the temperature field generated by a system of parallel heated wires placed in the turbulent flow. A variance of temperature fluctuation was evaluated from the thermoanemometry measurement employing a dual probe. Decay of the temperature fluctuations follows power law.
Velocity and Temperature Decay in Turbulent Flow behind Parallel Heat Sources
Antoš, Pavel ; Uruba, Václav
Paper deals with the velocity and temperature field generated by a system of parallel heated wires placed in grid-generated turbulent flow. Development of the temperature field was studied for a number of configurations of grid generator and line heater was investigated experimentally. Decay of the temperature fluctuations was evaluated from thermoanemometry measurements.
HWA Measurement of Turbulent Diffusion of a Scalar Quantity
Antoš, Pavel
The paper deals with simultaneous measurement of the velocity and the scalar quantity by means of hot-wire anemometry. Statistical moments of the scalar quantity fluctuations can be obtained employing a dual hot-wire probe. An evaluation procedure of the mean values and the fluctuations is described. Results from the molar concentration measurement in binary-gas mixture are shown.
Development of Two-Sensor Hot-Wire Probes for Measurement of the Velocity and the Temperature
Antoš, Pavel ; Mazur, Oton
Characteristics of a new two-sensor HWA probe designed for simultaneous measurement of the velocity and the flow temperature are described. A comparison with previously developed probe is given. Both tested probes were developed and manufactured at Fluid dynamics laboratory of the Institute of Thermomechanics.
An Overview of Hot-Wire Probes for Simultaneous Measurement of the Velocity and the Scalar Quantity
Antoš, Pavel ; Mazur, Oton ; Uruba, Václav
Paper deals with properties of multiple-sensor hot-wire probes which has been developed in Fluid Dynamics dept. of the Institute of Thermomechanics of the Academy of Sciences of the Czech Republic for simultaneous measurement of the velocity and the concentration or the flow temperature.
Measuremnt of Directional Characteristics of Three Type of Two-sensor Anemometry Probes
Antoš, Pavel ; Mazur, Oton ; Uruba, Václav
In the paper, there is a comparison of the directional characteristics of three types of two-sensor probes given in the paper. All tested probes were developed and manufactured at Fluid dynamics laboratory of the Institute of Thermomechanics.
Measurement of the Molar Concentration in Air-Carbon Dioxide Mixture by Means of Hot-wire Anemometry
Antoš, Pavel ; Jonáš, Pavel ; Mazur, Oton ; Uruba, Václav
The diffusion of the fluid particles is one of the important fundamental problems of the research of transitional and turbulent flows. This phenomena is of great importance in case of pollutants spreading. In experimental study of the diffusion there is commonly used an admixture gas as a tracer, which enter the main airflow. The paper deals with the simultaneous measurement of the velocity and the molar concentration in binary-gas mixture by means of hot-wire anemometry. A special three-sensor probe has been manufactured and the calibration in Air-CO2 mixture is presented.

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