Experimental investigation of secondary flow in a heated channel using PIV and LIF simultaneously

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24210%2F24%3A00010248" target="_blank" >RIV/46747885:24210/24:00010248 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1051/epjconf/202429901033" target="_blank" >https://doi.org/10.1051/epjconf/202429901033</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/epjconf/202429901033" target="_blank" >10.1051/epjconf/202429901033</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Experimental investigation of secondary flow in a heated channel using PIV and LIF simultaneously

Popis výsledku v původním jazyce

This paper describes an investigation of thermo-convective structures called Rayleigh-Bénard-Poiseuille (RBP) convection in a wide rectangular water channel formed above a heated bottom-wall section. The phenomenon was investigated experimentally using planar Particle Image Velocimetry (PIV) for velocity vector field data and 2-color Laser-Induced Fluorescence (LIF) for temperature scalar field data. The raw PIV and LIF data were taken simultaneously on three cameras (one for PIV and two for LIF) in the central vertical plane of the channel to detection of secondary flow due to the natural convection. The result is the combined temperature and velocity data used to evaluate the onset point of the secondary flow. The manifestation of this phenomenon on both velocity and temperature fields is described. The LIF method was confirmed to give more satisfactory results because the PIV method is generally less suitable for lower velocity measurement in boundary layers, both because of adverse reflections and because of the limitation for measuring very low velocities near walls. The measured data were compared with theoretical dependencies and with data from other authors. Other limitations of the measurement were described and steps for its improvement were suggested. In the present setup, temperature influence by the laser was observed, which needs to be investigated more thoroughly and eliminated in future work.

Název v anglickém jazyce

Experimental investigation of secondary flow in a heated channel using PIV and LIF simultaneously

Popis výsledku anglicky

This paper describes an investigation of thermo-convective structures called Rayleigh-Bénard-Poiseuille (RBP) convection in a wide rectangular water channel formed above a heated bottom-wall section. The phenomenon was investigated experimentally using planar Particle Image Velocimetry (PIV) for velocity vector field data and 2-color Laser-Induced Fluorescence (LIF) for temperature scalar field data. The raw PIV and LIF data were taken simultaneously on three cameras (one for PIV and two for LIF) in the central vertical plane of the channel to detection of secondary flow due to the natural convection. The result is the combined temperature and velocity data used to evaluate the onset point of the secondary flow. The manifestation of this phenomenon on both velocity and temperature fields is described. The LIF method was confirmed to give more satisfactory results because the PIV method is generally less suitable for lower velocity measurement in boundary layers, both because of adverse reflections and because of the limitation for measuring very low velocities near walls. The measured data were compared with theoretical dependencies and with data from other authors. Other limitations of the measurement were described and steps for its improvement were suggested. In the present setup, temperature influence by the laser was observed, which needs to be investigated more thoroughly and eliminated in future work.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

EPJ Web of Conferences

ISBN

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ISSN

2101-6275

e-ISSN

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Počet stran výsledku

5

Strana od-do

—

Název nakladatele

—

Místo vydání

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Místo konání akce

Dvůr Králové nad Labem

Datum konání akce

1. 1. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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