General Dusty Gas Model for porous media with a specified pore size distribution

Das, Sandipan Kumar

doi:10.1016/j.ces.2019.03.085

Cited by 19 publications

(7 citation statements)

References 18 publications

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“…High membrane porosity also reduces the resistance to the diffusional transport of volatile molecules through the pores, promoting higher transmembrane fluxes. As established by the Dusty Gas Model, 317 both effective free molecular diffusion coefficient and effective Knudsen diffusion increase linearly with porosity ( ε ):where τ is the tortuosity, d p is the average pore diameter, R is the universal gas constant, T is the temperature, and M i is the molecular weight of the diffusing species. Additionally, porosity affects the energetics of PMD, when one considers that a low thermal conductivity ( k m ) of the membrane is required to prevent heat loss to the distillate side (eqn (4)).…”

Section: Challenges In Pmdmentioning

confidence: 99%

The advent of thermoplasmonic membrane distillation

et al. 2022

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Section: Challenges In Pmdmentioning

confidence: 99%

The advent of thermoplasmonic membrane distillation

et al. 2022

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“…Both feed and permeate flows are kept under constant pressure (about 0.8 bar) inside the membrane module, so no transmembrane hydrostatic pressure is applied, and a Poiseuille-type mechanism of transport is negligible [22]. Considering these assumptions, the Dusty gas model is the most widely developed model to simulate mass transfer through the porous membrane [23]. Three main mass transfer mechanisms were studied in membrane cavities, including molecular diffusion, Knudsen, and Knudsenmolecular diffusion models.…”

Section: Mass Transfer Modelmentioning

confidence: 99%

Bispacer Multi-Stage Direct Contact Membrane Distillation System: Analytical and Experimental Study

Khoshvaght-Aliabadi¹,

Ghorashi²,

Motlagh³

et al. 2021

Processes

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A multi-staged direct contact membrane distillation (MDCMD) system is designed considering a novel bispacer configuration in the present study. The proposed bispacer DCMD, which has not been addressed in the literature to best of our knowledge, is considered with two purposes, including increasing mechanical stability and turbulence. As increasing turbulence leads to increasing Nusselt number, the bispacer MDCMD provides higher permeate flux. An analytical approach is considered using energy and mass balance correlation. The effect of bispacer and feed operating conditions, including feed temperature, feed flow rate, feed salinity, and the number of stages on permeate flux and salt rejection of the developed MDCMD, are examined both analytically and experimentally. The performance and sustainability of the developed system were investigated by analyzing the parameters, including thermal efficiency (η), gained output ratio (GOR), and temperature polarization coefficient (TPC).

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“…Generally, the zeolite pore (< 1 nm) contributes to the Knudsen diffusion, while the nonzeolite pores (> 1 nm) caused by the defects result in the viscous flow. The low viscous flow coefficient (0.26) was derived after linear fitting (Figure 7) based on the dusty gas model [35,36,41,42], indicating negligible viscous flow for the period-TS-1 membranes. This suggests a low defect-free structure in the period-TS-1 membrane.…”

Section: Pore Distribution Of the Ts-1 Membranementioning

confidence: 99%

Facile Preparation of Bilayer Titanium Silicate (TS-1) Zeolite Membranes by Periodical Secondary Growth

Zhang¹,

Liu

et al. 2019

Coatings

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A facile periodical secondary growth method, based on conventional secondary growth, is proposed to prepare bilayer TS-1 membranes. The novel periodical secondary growth consists of two or several periods, which involve three steps: the temperature is programmed to a desired crystallization temperature as the first stage, followed by holding for a certain duration, and finally cooling to room temperature. This periodical crystallization model enables a bilayer TS-1 membrane to be produced, while the conventional secondary growth method produces a monolayer TS-1 membrane. The bilayer TS-1 membrane exhibits a superior defect-free structure and hydrophobic properties, as illustrated by SEM, gas permeance, pore size distribution analysis, and water contact angle measurement. It displays an earlier desalination separation factor compared to the monolayer TS-1 membrane. This work demonstrates that the periodical secondary growth is an advanced approach for preparing a bilayer zeolite membrane with excellent properties.

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General Dusty Gas Model for porous media with a specified pore size distribution

Cited by 19 publications

References 18 publications

The advent of thermoplasmonic membrane distillation

The advent of thermoplasmonic membrane distillation

Bispacer Multi-Stage Direct Contact Membrane Distillation System: Analytical and Experimental Study

Facile Preparation of Bilayer Titanium Silicate (TS-1) Zeolite Membranes by Periodical Secondary Growth

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