title: Migrating temperature "thermo-chromatographic" pulses (TCP) initiated by radio-frequency (RF) heating.
abstract: In the present study, the astonishing influence of water dosage on a purged dry packed bed of NaY zeolite in the presence of an electric field with a frequency of 13.56 MHz was investigated. The injection of a small amount of water to the inlet of the bed led to pronounced selective heating of the inlet zone by more than 150 K. Thus, water represented a very effective coupling medium for dielectric heating. The selectively heated zone then slowly moved through the whole packed bed and a water pulse finally left the zeolite. This effect correlated with a coupled water and heat flux was called thermo-chromatographic pulse (TCP) emphasizing its analogy to chromatography. The phenomenon could not be performed by using conventional (convective) or microwave heating. It was demonstrated under various conditions and explained by a new model based on own experimental results as well as data from literature. The model will be the objective of a forthcoming publication.
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstr. 15, 04318 Leipzig, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Kraus
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstr. 15, 04318 Leipzig, Germany.
authors.forename: Frank-Dieter
authors.initials: FD
authors.lastname: Kopinke
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstr. 15, 04318 Leipzig, Germany.
authors.forename: Ulf
authors.initials: U
authors.lastname: Roland
mesh_terms: D002845:Chromatography / Q000379:methods; D003198:Computer Simulation; D004735:Energy Transfer / Q000528:radiation effects*; D006361:Heating / Q000379:methods*; D008422:Materials Testing; D008872:Microwaves; D008956:Models, Chemical; D011829:Radiation Dosage; D011846:Radio Waves; D013696:Temperature; D013814:Thermal Conductivity; D014867:Water / Q000737:chemistry*; D017641:Zeolites / Q000737:chemistry* / Q000528:radiation effects*
chemical_list: D014867:Water; D017641:Zeolites