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National Repository of Grey Literature 24 records found  beginprevious21 - 24  jump to record: Search took 0.01 seconds. 
Střihové napětí na stěně pod velkou bublinou stoupající v nakloněném plochém kanále
 Tihon, Jaroslav ; Pěnkavová, Věra ; Vejražka, Jiří
The motion of single air bubbles in an inclined flat water channel is investigated experimentally. The electrodiffusion technique of near-wall flow diagnostics is applied to measure the wall shear stress distribution under large bubbles rising along the upper channel wall. The electrodiffusion measurements are synchronized with the visual observation of bubble movement done by a high-speed camera. The analysis of video records provides information on the bubble shape and terminal velocity. The experiments are carried out for three different channel heights and cover a wide range of channel inclination angles (from horizontal to vertical position). The experimental results on bubble motion characteristics obtained in stagnant and upward-flowing liquid arrangements are confronted with the recent predictions and scaling provided by theoretical models.
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Rheologie vodných nanosuspenzí
 Večeř, Marek ; Tihon, Jaroslav ; Pěnkavová, Věra
Recent works have shown that suspensions of highly thermally conducting nanoparticles have great potential as a high-energy carrier for small flow channel systems. Information on the viscosity of nanofluids is needed for successful modeling of such flow systems.
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Vliv pulzací nátoku na strukturu toku v kanále za náhlým rozšířením.
 Pěnkavová, Věra ; Tihon, Jaroslav
The wall shear rate profiles were measured along the bottom and roof walls of rectangular channel with backward-facing step. The profiles were measured by two-strip electrodiffusion probes. It is possible to see the strong effect of the inlet flow pulsations on the flow structure. The influence of the inlet flow pulsation was studied for various frequence and amplitude for water when the Reynolds number was ranging from 100 to 1500 and expansion ratio of the channel was 2.
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Struktura toku v kanále za náhlým rozšířením.
 Tihon, Jaroslav ; Pěnkavová, Věra
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National Repository of Grey Literature : 24 records found   beginprevious21 - 24  jump to record:
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