A non-stationary, non-isothermal model of the microclimate inside the shoe : comparison of leather and synthetics / A. Sàra in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 72 (Année 1988)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 72 (Année 1988) . - p. 7-18 Titre : A non-stationary, non-isothermal model of the microclimate inside the shoe : comparison of leather and synthetics Type de document : texte imprimé Auteurs : A. Sàra, Auteur ; F. Langmaier, Auteur Année de publication : 1988 Article en page(s) : p. 7-18 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A mathematical model of the non-stationary non-isothermal microclimate inside the worn shoe was developed on the basis of the balance of moisture and heat transport in the system foot-shoe-surroundings. The solution of the model formed by a set of two partial differential equations and pertinent boundary and initial conditions was performed by use of the Laplace transformation. On the basis of the knowledge of a number of material and process parameters, the time dependences of humidity and temperature inside the shoe were calculated. The theoretical predictions agree well with experimental data. The natural material (side leather) has proved to be a better than microporous synthetics with which a favourable influence of the increased humidity sorption was observed for short-time wear, i.e. up to 4 h. The model can be used both for the prediction of the microclimate inside particular shoes and for comparison of footwear made from different materials. En ligne : https://drive.google.com/file/d/16UderSESRudwM_wE7fxZE4sSVvUhTuqd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9089 [article]

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The simultaneous transfer of heat and moisture in leather / A. Sàra in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 68 (Année 1984)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 68 (Année 1984) . - p. 23-30 Titre : The simultaneous transfer of heat and moisture in leather Type de document : texte imprimé Auteurs : A. Sàra, Auteur ; F. Langmaier, Auteur Année de publication : 1984 Article en page(s) : p. 23-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Effets de l'humidité Cuirs et peaux -- Effets de la température Thermocinétique Transfert d'humidité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This paper deals with the transfer of heat and moisture in a pile of leathers with impermeable boundaries, which is caused by a jump in temperature at the boundaries. It is proved mathematically that changes in temperature take place in two "waves", with diffusion coefficients derived using the Henry theory of the simultaneous diffusion in porous sorbing materials, although the resulting relationships may be obtained only by use of a more common procedure under even more common assumptions than Henry's method. The results are compared with the experimental and theoretical data of Mitton and Dowsett obtained by use of an approximate solution with which they provide a good agreement. In conclusion, some important practical consequences of both the process and mathematical theory are mentioned. Note de contenu : - Introduction - Experimental - Parameters of the modified Henry equations - Theoretical - Comparison of theoretical and experimental values En ligne : https://drive.google.com/file/d/1XNS5NNKfVjKaaOhOxeEUNWfAmwc3RlAq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34144 [article]

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