Effects of the starch indicator on the buoyantly unstable iodate-arsenous acid reaction front

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985874%3A_____%2F17%3A00477744" target="_blank" >RIV/67985874:_____/17:00477744 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985858:_____/17:00477744

Výsledek na webu

<a href="http://dx.doi.org/10.1002/slct.201701276" target="_blank" >http://dx.doi.org/10.1002/slct.201701276</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/slct.201701276" target="_blank" >10.1002/slct.201701276</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effects of the starch indicator on the buoyantly unstable iodate-arsenous acid reaction front

Popis výsledku v původním jazyce

Buoyantly unstable chemical fronts, which propagated in the iodate arsenous acid reaction system, were studied experimentally in 3D space and numerically in vertical 2D space. The fronts invaded the reaction solution from the left top corner in horizontal and vertical directions. Before the starch effects were examined condition under which friction did not influence the front propagation were found both experimentally and numerically. The critical solution depth and the critical distance between lateral walls, above which the front speed is not influenced by friction, were determined. Moreover, the results also show that the 2D simulations correspond to a vertically oriented plane placed the 3D experiments in 1/2 of the walls distance and along the x axis of the reactor. Importantly, those results also show that friction caused by the presence of solid side walls exclude pseudo 2D experiments to be compared with 2D simulations, when flow is involved. The effects of starch on the IAA fronts were studied experimentally at conditions, at which the friction did not influence the front propagation. Although the starch is used in very low concentrations as an iodine indicator, the experimental results show that starch presence strongly affects the dynamics of the liquid IAA reaction system. The presence of starch decreases the front velocity independently on the direction of the front propagation. Starch also affects the pattern formation. A possible mechanism is discussed.

Název v anglickém jazyce

Effects of the starch indicator on the buoyantly unstable iodate-arsenous acid reaction front

Popis výsledku anglicky

Buoyantly unstable chemical fronts, which propagated in the iodate arsenous acid reaction system, were studied experimentally in 3D space and numerically in vertical 2D space. The fronts invaded the reaction solution from the left top corner in horizontal and vertical directions. Before the starch effects were examined condition under which friction did not influence the front propagation were found both experimentally and numerically. The critical solution depth and the critical distance between lateral walls, above which the front speed is not influenced by friction, were determined. Moreover, the results also show that the 2D simulations correspond to a vertically oriented plane placed the 3D experiments in 1/2 of the walls distance and along the x axis of the reactor. Importantly, those results also show that friction caused by the presence of solid side walls exclude pseudo 2D experiments to be compared with 2D simulations, when flow is involved. The effects of starch on the IAA fronts were studied experimentally at conditions, at which the friction did not influence the front propagation. Although the starch is used in very low concentrations as an iodine indicator, the experimental results show that starch presence strongly affects the dynamics of the liquid IAA reaction system. The presence of starch decreases the front velocity independently on the direction of the front propagation. Starch also affects the pattern formation. A possible mechanism is discussed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GAP105%2F10%2F0919" target="_blank" >GAP105/10/0919: Hydrodynamické nestability vyvolané přítomností chemické reakce v kapalném systému s volnou hladinou</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

ChemistrySelect

ISSN

2365-6549

e-ISSN

—

Svazek periodika

2

Číslo periodika v rámci svazku

24

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

9

Strana od-do

7141-7149

Kód UT WoS článku

000408644100031

EID výsledku v databázi Scopus

2-s2.0-85041800877