Two-phase modeling of heat and mass transfer in packed bed absorbers: Implications for process design

Diamantis, DJ; Georgiadis, JG; Goussis, DA

dc.contributor.author	Diamantis, DJ	en
dc.contributor.author	Georgiadis, JG	en
dc.contributor.author	Goussis, DA	en
dc.date.accessioned	2014-03-01T02:14:52Z
dc.date.available	2014-03-01T02:14:52Z
dc.date.issued	2012	en
dc.identifier.issn	1091028X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30159
dc.subject	Active carbon	en
dc.subject	Adsorption	en
dc.subject	Asymptotics	en
dc.subject	P-nitrophenol	en
dc.subject	Packed bed	en
dc.subject	Porous media	en
dc.subject.other	Activated carbon particles	en
dc.subject.other	Active carbon	en
dc.subject.other	Adsorbers	en
dc.subject.other	Asymptotics	en
dc.subject.other	Break through curve	en
dc.subject.other	Characteristic length	en
dc.subject.other	Convective transport	en
dc.subject.other	Cylindrical tubes	en
dc.subject.other	Effluent waters	en
dc.subject.other	Engineering correlations	en
dc.subject.other	Environmentally benign	en
dc.subject.other	Heat and mass transfer	en
dc.subject.other	Interstitial space	en
dc.subject.other	Micropollutants	en
dc.subject.other	Overall efficiency	en
dc.subject.other	p-Nitrophenol	en
dc.subject.other	Packed bed absorbers	en
dc.subject.other	Single unit operation	en
dc.subject.other	Time-scales	en
dc.subject.other	Transient heat	en
dc.subject.other	Two-phase modeling	en
dc.subject.other	Water purification	en
dc.subject.other	Activated carbon	en
dc.subject.other	Adsorption	en
dc.subject.other	Effluents	en
dc.subject.other	Heat transfer	en
dc.subject.other	Mass transfer	en
dc.subject.other	Porous materials	en
dc.subject.other	Process design	en
dc.subject.other	Water supply	en
dc.subject.other	Packed beds	en
dc.title	Two-phase modeling of heat and mass transfer in packed bed absorbers: Implications for process design	en
heal.type	journalArticle	en
heal.identifier.primary	10.1615/JPorMedia.v15.i5.50	en
heal.identifier.secondary	http://dx.doi.org/10.1615/JPorMedia.v15.i5.50	en
heal.publicationDate	2012	en
heal.abstract	Removal of micropollutants in packed bed adsorbers constitutes an environmentally benign water purification process. Rather than adopting engineering correlations, the present work focuses on process design starting from the simulation of a single unit operation. Water contaminated with p-nitrophenol flows through a cylindrical tube, which is packed with spherical activated carbon particles acting as the adsorbent. The process is simulated numerically by modeling transient heat and mass transfer in both phases (solid and liquid) that comprise the packed bed. Breakthrough curves are computed and the overall efficiency of the process is evaluated. It is shown that in order to lengthen the time during which the effluent water is decontaminated, the convective transport of the contaminant in the interstitial space must equilibrate quickly with diffusion of the contaminant inside the particles. Expressions for the characteristic length and time scales to reach this equilibrium are derived. It is demonstrated that the design of the adsorption device can be optimized by decreasing the bed length and/or by increasing the diameter of the particles, when keeping the pressure drop and the volume of the bed fixed. Regarding the heat released by adsorption, it is shown that the temperature ahead of the mass transfer zone rises uniformly due to convective transport. © 2012 by Begell House, Inc.	en
heal.journalName	Journal of Porous Media	en
dc.identifier.doi	10.1615/JPorMedia.v15.i5.50	en
dc.identifier.volume	15	en
dc.identifier.issue	5	en
dc.identifier.spage	459	en
dc.identifier.epage	473	en