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Effect of flow structures on heat transfer in single and multiphase jet reactors / Sagar S. Deshpande in Industrial & engineering chemistry research, Vol. 48 N° 21 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9428–9440 Titre : Effect of flow structures on heat transfer in single and multiphase jet reactors Type de document : texte imprimé Auteurs : Sagar S. Deshpande, Auteur ; Channamallikarjun S. Mathpati, Auteur ; Sagar S. Gulawani, Auteur Année de publication : 2010 Article en page(s) : pp. 9428–9440 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hot  film  anemometry  Heat  transfer  Multiphase  jet  reactors Résumé : High frequency experimental measurements by hot film anemometry (HFA) of liquid velocities and temperature in the region of vapor−liquid (VL) and solid−liquid (SL) interfaces for two important reactor types, namely, condensation jet and jet loop reactors, have been studied for their heat transfer characteristics. An algorithm for flow structure identification has been devised from velocity data based on (i) zero crossings and (ii) continuous wavelet transform. The wavelet transform algorithm is especially found to be useful in accurately estimating both the age and size distributions of eddies near interfaces in a multiscale framework. Using these distributions, it is shown that the calculated values of heat transfer coefficients (HTC) at the SL and VL interfaces show remarkable correspondence with the HTC values obtained experimentally from instantaneous temperature measurements. For this purpose, a modified capacitance model has been proposed that takes into account the information about both the age and size distributions. The results obtained by the present methodology show the improvement possible for calculating the HTC at interfaces when compared with the earlier surface renewal models. It may therefore be used to study the interaction between flow dynamics and heat transfer behavior in chemical process equipment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900052s [article] Effect of flow structures on heat transfer in single and multiphase jet reactors [texte imprimé] / Sagar S. Deshpande, Auteur ; Channamallikarjun S. Mathpati, Auteur ; Sagar S. Gulawani, Auteur . - 2010 . - pp. 9428–9440. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9428–9440 Mots-clés : Hot  film  anemometry  Heat  transfer  Multiphase  jet  reactors Résumé : High frequency experimental measurements by hot film anemometry (HFA) of liquid velocities and temperature in the region of vapor−liquid (VL) and solid−liquid (SL) interfaces for two important reactor types, namely, condensation jet and jet loop reactors, have been studied for their heat transfer characteristics. An algorithm for flow structure identification has been devised from velocity data based on (i) zero crossings and (ii) continuous wavelet transform. The wavelet transform algorithm is especially found to be useful in accurately estimating both the age and size distributions of eddies near interfaces in a multiscale framework. Using these distributions, it is shown that the calculated values of heat transfer coefficients (HTC) at the SL and VL interfaces show remarkable correspondence with the HTC values obtained experimentally from instantaneous temperature measurements. For this purpose, a modified capacitance model has been proposed that takes into account the information about both the age and size distributions. The results obtained by the present methodology show the improvement possible for calculating the HTC at interfaces when compared with the earlier surface renewal models. It may therefore be used to study the interaction between flow dynamics and heat transfer behavior in chemical process equipment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900052s