Abstract
Drying of solids is one of the oldest and most common unit operations found in diverse processes. In this paper the drying of hygroscopic textile materials is discussed. The authors have previously investigated the drying kinetic of different fabrics dried by a hot air jet. In this paper a comparison between the convective and electric IR drying is made. In particular two fabrics with fibers which show a different hygroscopic behaviour are analysed: wool and cellulose/cotton. Unlike the convective drying, IR drying is weakly affected by the radiation properties and by the hygroscopic behaviour of the two fabrics. This is likely due to a better diffusion of the heat flux, which is constant over the entire drying surface in the case of IR heating, and produces unexpected results on the nondimensional kinetic parameter (characteristic curve). Wool shows a complete different characteristic curve if dried with IR or with convective flow. The better performances have been reached with MW emitter, but it has been observed that this advantage decreases with the distance of the source from the surface to be dried.
Highlights
Drying of solids is one of the oldest and most common unit operations found in diverse processes such as those used in the agricultural, ceramic, chemical, food, pharmaceutical, pulp and paper, mineral, polymer, and textile industries
In this paper IR drying given by different EL-IR emitters has been experimentally compared with a convective one, by drying different thin hygroscopic textile media
The performances of IR drying, with two different emitters, (MW and Long Wave (LW)) has been qualitatively compared with that of a convective drying with similar power area density
Summary
Performances of infrared emitters applied to the porous thin materials drying This content has been downloaded from IOPscience. S. Sutton Modelling of field emitter surface structure K A Nikiforov, N V Egorov and M N Lunkovskiy A hygrostat of special design H W Harkness Experimental investigation on influence of porous material properties on drying process by a hot air jet P Di Marco and S Filippeschi Deposition of silicon-like hybrid films by PECVD on carbon-fiber-reinforced polymers for high-precision engineering applications A Cremona, E Vassallo, A Merlo et al Electron source with a multi-apertured plasma emitter M S Vorobyov, N N Koval and S A Sulakshin Modelling of field emitter array characteristics in diode system K A Nikiforov and M F Sayfullin A Study of Hybrid Drying Process to Improve Drying Speed and Electrical Conductivity for Roll-to-Roll Printing Jiyong Park and Sehun Rhee
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