Detail publikace

Modeling of gas-phase heterogeneous photocatalytic oxidation reactor in the presence of mass transfer limitation and axial dispersion

MALAYERI, M. LEE, C.-S. HAGHIGHAT, F. KLIMEŠ, L.

Originální název

Modeling of gas-phase heterogeneous photocatalytic oxidation reactor in the presence of mass transfer limitation and axial dispersion

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Mass transfer plays a critical role in the efficiency of photocatalytic oxidation (PCO) technology for air purification applications. There has been limited work on the exploration of mass transfer in the PCO reactor with the non-ideal flow. In this work, the performance of a continuous heterogeneous ultraviolet photocatalytic oxidation (UV-PCO) reactor was investigated and addressed under mass transfer limitation and axial dispersion. First, CFD modeling was used to determine the flow distribution in the reactor at various airflow rates. The residence time distribution (RTD) analysis with a tracer gas (CO2) was carried out for the experimental validation of the simulation model and good agreement between experimental and simulation data was achieved. Further, a quick and straightforward methodology employing an axial dispersion plug flow model was used to study the RTD. The proposed model could predict the residence time distribution of CO2 with high accuracy. Results of the RTD for CO2 in the presence and absence of a PCO filter (silica fiber felts (SFF) modified with TiO2) were almost identical due to the high porosity of the filter. The model was then used for the evaluation of the axial dispersion of methyl ethyl ketone (MEK) at different flow rates. Owing to a low value of the Peclet number (Pe < 100), the flow in the reactor deviated from an ideal plug flow and dispersion could not be ignored. The photocatalysis reaction of MEK by the SFF filter under the mass-transfer-controlled regime was further addressed. A steady-state mass balance equation was implemented for the assessment of the performance of the UV-PCO reactor in the presence of axial dispersion and mass transfer limitation. The mass transfer coefficient was calculated with the use of the developed model and a correlation for the Sherwood number was proposed to relate the mass transfer coefficient to the flow rate and fiber structure. The proposed correlation was assessed and compared with the other empirical formulas available in the literature.

Klíčová slova

UV-PCO reactor; air purification; CFD analysis; residence time distribution; mass transfer coefficient; Sherwood number

Autoři

MALAYERI, M.; LEE, C.-S.; HAGHIGHAT, F.; KLIMEŠ, L.

Vydáno

15. 4. 2020

ISSN

1385-8947

Periodikum

CHEMICAL ENGINEERING JOURNAL

Ročník

386

Číslo

1

Stát

Švýcarská konfederace

Strany od

124013

Strany do

124013

Strany počet

11

URL

https://www.sciencedirect.com/science/article/pii/S1385894720300048

BibTex

@article{BUT161362,
  author="MALAYERI, M. and LEE, C.-S. and HAGHIGHAT, F. and KLIMEŠ, L.",
  title="Modeling of gas-phase heterogeneous photocatalytic oxidation reactor in the presence of mass transfer limitation and axial dispersion",
  journal="CHEMICAL ENGINEERING JOURNAL",
  year="2020",
  volume="386",
  number="1",
  pages="124013--124013",
  doi="10.1016/j.cej.2020.124013",
  issn="1385-8947",
  url="https://www.sciencedirect.com/science/article/pii/S1385894720300048"
}