Mystery Well: Chemical-Engineering Solution to the Internal Rain Problem.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F17%3A00478381" target="_blank" >RIV/67985858:_____/17:00478381 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ces.2017.09.025" target="_blank" >http://dx.doi.org/10.1016/j.ces.2017.09.025</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ces.2017.09.025" target="_blank" >10.1016/j.ces.2017.09.025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mystery Well: Chemical-Engineering Solution to the Internal Rain Problem.

Popis výsledku v původním jazyce

The motivation of this study is to contribute to the problem from the chemical-engineering point of view, considering the Mystery Well to be a multiphase contacting/reacting/transporting system. The goal is to show that the anticipated convective circulatory motions can really develop. A simple model is suggested, based on the available data and elementary theoretical reasoning (evaporative convection, thermal instability, Rayleigh number, buoyant flows, dew point, multiphase effects). The instability condition for the Rayleigh-Benard convection is formulated. The estimated actual Rayleigh number Ra is by a few orders higher than the critical value, indicating the presence of convective motions. A simple mechanism for the rain formation is suggested, different for both year seasons. In summer, the evaporationndriven convection could develop in the lower isothermal and cold part of the well, where the vapour saturated light air ascends and penetrates into the thermally stably stratified upper zone. This up-flow is compensated by the down-flow of the warm humid air from the ambient that reaches the dew point and the vapour precipitates. In winter, the whole gas layer in the well is doubly unstably stratified, by both the thermal and humidity (bottom 100%, ambient about 80%) vertical profiles. The estimated Ra-values for the thermal and the humidity convections are above the critical. The model prediction is compared with the publishednexperimental data obtained in the summer season.

Název v anglickém jazyce

Mystery Well: Chemical-Engineering Solution to the Internal Rain Problem.

Popis výsledku anglicky

The motivation of this study is to contribute to the problem from the chemical-engineering point of view, considering the Mystery Well to be a multiphase contacting/reacting/transporting system. The goal is to show that the anticipated convective circulatory motions can really develop. A simple model is suggested, based on the available data and elementary theoretical reasoning (evaporative convection, thermal instability, Rayleigh number, buoyant flows, dew point, multiphase effects). The instability condition for the Rayleigh-Benard convection is formulated. The estimated actual Rayleigh number Ra is by a few orders higher than the critical value, indicating the presence of convective motions. A simple mechanism for the rain formation is suggested, different for both year seasons. In summer, the evaporationndriven convection could develop in the lower isothermal and cold part of the well, where the vapour saturated light air ascends and penetrates into the thermally stably stratified upper zone. This up-flow is compensated by the down-flow of the warm humid air from the ambient that reaches the dew point and the vapour precipitates. In winter, the whole gas layer in the well is doubly unstably stratified, by both the thermal and humidity (bottom 100%, ambient about 80%) vertical profiles. The estimated Ra-values for the thermal and the humidity convections are above the critical. The model prediction is compared with the publishednexperimental data obtained in the summer season.

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

2017

Kód důvěrnosti údajů

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

Název periodika

Chemical Engineering Science

ISSN

0009-2509

e-ISSN

—

Svazek periodika

174

Číslo periodika v rámci svazku

DEC 31

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

396-402

Kód UT WoS článku

000413321000035

EID výsledku v databázi Scopus

2-s2.0-85029790642