Wyniki wyszukiwania - BazTech

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Underwater noise emitted during small-scale air entrainment events

Szuszkiewicz J., Klusek Z.

Oceanological and Hydrobiological Studies

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2018

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Vol. 47, No. 1

87--97

EN

The breaking wave phenomenon significantly takes part in the mechanisms of mass, heat and gas exchange at the air-water boundary and depends on the wind velocity. Some of the energy dissipated during this process is converted into underwater sound emitted by oscillating gas bubbles and bubble plumes. However, the underwater noise accompanying the lowest wind speed conditions has received only little attention. This report describes a study aimed at advancing the knowledge of underwater noise emission from air bubbles injected during small-scale breaking events occurring on the water surface. Results of model experiments performed in a small tank are presented. The object of the research is the relationship between the generated noise and the dissipated potential energy of water poured into a tank filled with water of varying physical water properties. Additionally, the impact of various water properties such as salinity, surface tension or microscale gas bubbles was examined. The experiment revealed that noise spectra are affected by different water properties and most likely reffect the varying efficiency of bubble formation and bubble size spectra.

2

Impact of salinity on the underwater noise generated by small scale air entrainment events

Szuszkiewicz J., Klusek Z., Gorska N.

Hydroacoustics

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2017

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Vol. 20

167--172

EN

Some part of the energy released in the wave breaking process is transformed into the energy of the noise. This sound depends on the water properties, however, there is a lack of reliable data concerning the underwater noise generated by less energetic events. The aim of this study was to understand the impact of salinity on the underwater noise produced during small scale air entrainment events, typical for low wind speed conditions. The tipping trough experiment was performed in a small tank to generate the small scale air injections. Four, linearly placed hydrophones HTI-96-MIN were used to record the acoustic noise accompanying this phenomenon. The bubble plume development, and underwater noise spectra, were compared for salty and fresh water. The potential energy of the modeled events resulted in different spectra, and salinity played an essential role in the emitted underwater noise.

3

Experimental study of thermal pyrolysis of turkey feathers

Kardaś D., Kluska J., Szuszkiewicz J., Szumowski M.

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2015

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nr 18(2)

115-124

EN

The analysis of chemical composition of turkey feathers reveals over 50% mass content of carbon. Unfortunately, the feathers contain also over 13% by weight of nitrogen and over 2.5% of sulfur. The significant presence of nitrogen and sulfur in turkey feathers indicates potential danger to the environment. The experiments of thermal pyrolysis of turkey feathers were done from a perspective of energy production potential out of gaseous products. The products of thermal pyrolysis were mainly gas and liquid. The calorific value of pyrolysed feathers is comparable with the one of hard carbon. It gets higher for higher temperatures. The calorific value of gaseous products of turkey feathers at 850oC was maximum and it equalled 16.7 MJ/Nm3.

4

Evaluation of thermal state in reactor during plasma pyrolysis of polymers

Szuszkiewicz J.

Diagnostyka

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2009

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nr 2(50)

51-54

EN

Thermal conditions existing in the reactor, especially around the plasma jet, greatly influence on the course of the plasma pyrolysis including synthesis of derivative compounds. Measurements of the temperature distribution in the reactor will be helpful in carrying out the experiment of the plasma pyrolysis of polymers and also will be utilized to build the model of the plasma pyrolysis.

PL

Warunki termiczne panujące w reaktorze, szczególnie w otoczeniu strumienia plazmy, mają istotny wpływ na przebieg pirolizy plazmowej, w tym na syntezę związków wtórnych. Pomiar rozkładu temperatury w reaktorze będzie pomocny w przeprowadzaniu eksperymentu pirolizy plazmowej polimerów, a także posłuży do budowy modelu pirolizy plazmowej.