Generalized theory for wall shear stress measurement using circular-segment electrodiffusion probes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F25%3A00638744" target="_blank" >RIV/67985858:_____/25:00638744 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/44555601:13440/25:43899205

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0735193325007481?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0735193325007481?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.icheatmasstransfer.2025.109322" target="_blank" >10.1016/j.icheatmasstransfer.2025.109322</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Generalized theory for wall shear stress measurement using circular-segment electrodiffusion probes

Popis výsledku v původním jazyce

The present work establishes a new theoretical framework for wall shear stress measurements with electrodiffusion probes composed of circular segments, a generalization of the theory previously derived for twin semicircular probes. This newly proposed probe design extends the capabilities of near-wall flow measurements and provides deeper insights into boundary layer behavior. By deriving analytical formulas for the mass transfer coefficients, the study quantifies how the probe geometry and fluid flow direction affect mass transfer to each segment of the probe. A numerical solution of the convection-diffusion equation confirms the validity of these analytical formulas. In addition, a practical methodology for evaluating experimental measurements is presented that allows the electrical currents collected by the probe to be converted into a wall shear stress vector. The influence of the insulation gap position on diagnostic performance is also discussed, highlighting how different probe geometries can refine the sensitivity and accuracy of the measurement. Overall, the proposed approach broadens the possibilities of electrodiffusion-based measurements, allowing for a more versatile and detailed characterization of near-wall transport phenomena.

Název v anglickém jazyce

Generalized theory for wall shear stress measurement using circular-segment electrodiffusion probes

Popis výsledku anglicky

The present work establishes a new theoretical framework for wall shear stress measurements with electrodiffusion probes composed of circular segments, a generalization of the theory previously derived for twin semicircular probes. This newly proposed probe design extends the capabilities of near-wall flow measurements and provides deeper insights into boundary layer behavior. By deriving analytical formulas for the mass transfer coefficients, the study quantifies how the probe geometry and fluid flow direction affect mass transfer to each segment of the probe. A numerical solution of the convection-diffusion equation confirms the validity of these analytical formulas. In addition, a practical methodology for evaluating experimental measurements is presented that allows the electrical currents collected by the probe to be converted into a wall shear stress vector. The influence of the insulation gap position on diagnostic performance is also discussed, highlighting how different probe geometries can refine the sensitivity and accuracy of the measurement. Overall, the proposed approach broadens the possibilities of electrodiffusion-based measurements, allowing for a more versatile and detailed characterization of near-wall transport phenomena.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

International Communications on Heat and Mass Transfer

ISSN

0735-1933

e-ISSN

1879-0178

Svazek periodika

167

Číslo periodika v rámci svazku

part B

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

18

Strana od-do

109322

Kód UT WoS článku

001538580100005

EID výsledku v databázi Scopus

2-s2.0-105010905222