Consideration of the Joule-Thomson Effect for the Transport of Vapor through Anodic Alumina Membranes under Conditions of Capillary Condensation.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F19%3A00507676" target="_blank" >RIV/67985858:_____/19:00507676 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0298659" target="_blank" >http://hdl.handle.net/11104/0298659</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.seppur.2019.01.051" target="_blank" >10.1016/j.seppur.2019.01.051</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Consideration of the Joule-Thomson Effect for the Transport of Vapor through Anodic Alumina Membranes under Conditions of Capillary Condensation.

Popis výsledku v původním jazyce

Anodic alumina membranes have straight pores and a very uniform pore size distribution. Data on the permeance for the flow of isobutane vapors through anodic alumina membranes with pore diameters between 20 nm and 90 nm has been reported recently [Petukhov et al., J. Phys. Chem. C 120, 10982-10990, 2016]. For the upstream pressure approaching the saturation pressure, a sudden increase of the permeance was observed. Taking into account capillary condensation and assuming isothermal conditions within the entire flow field, the permeance data was used to compute the radii of curvature of the menisci separating the liquid condensate from the vapor.nIn the present work, the radius of curvature of the meniscus within the membrane is assumed to be known and kept fixed. From that, the expected permeance is computed employing three different descriptions. These are (i) a well known isothermal description, as also used by Petukhov et al. (2016), and two non-isothermal descriptions for which the energy balance is taken into account and (ii) an adiabatic or (iii) a diabatic boundary condition is applied at the downstream front of the membrane. These two latter descriptions correspond to no heat flux or arbitrarily large heat flux from downstreams to the downstream front of the membrane, respectively.nThe predicted permeances depend significantly on the chosen description. A comparison with experimental data indicates that a description with heat flux towards the downstream front of the membrane could agree best with data. However, the conclusion is that a determination of the radius of curvature of the meniscus within the membrane from permeance data alone is uncertain. Accurate temperature measurements at the upstream and downstream fronts of the membrane would increase the reliability of the determination of the radius of curvature of the meniscus within the membrane.n

Název v anglickém jazyce

Consideration of the Joule-Thomson Effect for the Transport of Vapor through Anodic Alumina Membranes under Conditions of Capillary Condensation.

Popis výsledku anglicky

Anodic alumina membranes have straight pores and a very uniform pore size distribution. Data on the permeance for the flow of isobutane vapors through anodic alumina membranes with pore diameters between 20 nm and 90 nm has been reported recently [Petukhov et al., J. Phys. Chem. C 120, 10982-10990, 2016]. For the upstream pressure approaching the saturation pressure, a sudden increase of the permeance was observed. Taking into account capillary condensation and assuming isothermal conditions within the entire flow field, the permeance data was used to compute the radii of curvature of the menisci separating the liquid condensate from the vapor.nIn the present work, the radius of curvature of the meniscus within the membrane is assumed to be known and kept fixed. From that, the expected permeance is computed employing three different descriptions. These are (i) a well known isothermal description, as also used by Petukhov et al. (2016), and two non-isothermal descriptions for which the energy balance is taken into account and (ii) an adiabatic or (iii) a diabatic boundary condition is applied at the downstream front of the membrane. These two latter descriptions correspond to no heat flux or arbitrarily large heat flux from downstreams to the downstream front of the membrane, respectively.nThe predicted permeances depend significantly on the chosen description. A comparison with experimental data indicates that a description with heat flux towards the downstream front of the membrane could agree best with data. However, the conclusion is that a determination of the radius of curvature of the meniscus within the membrane from permeance data alone is uncertain. Accurate temperature measurements at the upstream and downstream fronts of the membrane would increase the reliability of the determination of the radius of curvature of the meniscus within the membrane.n

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

2019

Kód důvěrnosti údajů

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

Název periodika

Separation and Purification Technology

ISSN

1383-5866

e-ISSN

—

Svazek periodika

215

Číslo periodika v rámci svazku

MAY 15

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

548-556

Kód UT WoS článku

000458941900058

EID výsledku v databázi Scopus

2-s2.0-85060433542