Heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries
Energy availability, heat conversion and transfer still represent an impediment to the food processing sector in developing countries. Optimisation of tubular heat exchangers remains a concern for equipment designers and manufacturers. This work assesses the performances of a turbulator in terms of heat transfer and fluid friction characteristics in a heat exchanger tube. The turbulator is designed based on an elliptic shape suited to be made locally. The geometric dispersions caused by this kind of manufacturing process were surveyed, and then considered in the study. Hence 26 turbulators, manufactured with or without geometric dispersions, and with 45° or 60° ellipses, were tested in three tubes of different diameters. To ensure the closest possible resemblance to actual applications, the tests were carried out using air as a working fluid, with a low range of Reynolds number (1700-8000 for heat transfer and 3000 to 16,000 for friction factor). The heat transfer rate in a tube fitted with a turbulator may be increased up to 900%, in turbulent flow and with a curve angle of 45°. On the flip side, there is a very big pressure drop. However, a surface-based dispersion of 30% which could be generated by local manufacturing leads to a 50% reduction in the friction factor, but only a 20% reduction in the Nusselt number. The models obtained will enable a multi-criteria analysis for heat exchanger optimisation in a context specific to developing countries.
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Subjects: | Q02 - Traitement et conservation des produits alimentaires, P05 - Ressources énergétiques et leur gestion, énergie cinétique tourbillonnaire, pays en développement, échangeur de chaleur, échange thermique, traitement des aliments, échange d'énergie, http://aims.fao.org/aos/agrovoc/c_84b9f8a3, http://aims.fao.org/aos/agrovoc/c_2222, http://aims.fao.org/aos/agrovoc/c_11483, http://aims.fao.org/aos/agrovoc/c_3521, http://aims.fao.org/aos/agrovoc/c_37969, http://aims.fao.org/aos/agrovoc/c_2568, |
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dig-cirad-fr-5759582024-01-29T05:32:01Z http://agritrop.cirad.fr/575958/ http://agritrop.cirad.fr/575958/ Heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries. Rivier Michel, Sebastian Patrick, Goli Thierry, Raffray Guilhem, Collignan Antoine. 2015. Applied Thermal Engineering, 81 : 92-101.https://doi.org/10.1016/j.applthermaleng.2015.01.078 <https://doi.org/10.1016/j.applthermaleng.2015.01.078> Heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries Rivier, Michel Sebastian, Patrick Goli, Thierry Raffray, Guilhem Collignan, Antoine eng 2015 Applied Thermal Engineering Q02 - Traitement et conservation des produits alimentaires P05 - Ressources énergétiques et leur gestion énergie cinétique tourbillonnaire pays en développement échangeur de chaleur échange thermique traitement des aliments échange d'énergie http://aims.fao.org/aos/agrovoc/c_84b9f8a3 http://aims.fao.org/aos/agrovoc/c_2222 http://aims.fao.org/aos/agrovoc/c_11483 http://aims.fao.org/aos/agrovoc/c_3521 http://aims.fao.org/aos/agrovoc/c_37969 http://aims.fao.org/aos/agrovoc/c_2568 Energy availability, heat conversion and transfer still represent an impediment to the food processing sector in developing countries. Optimisation of tubular heat exchangers remains a concern for equipment designers and manufacturers. This work assesses the performances of a turbulator in terms of heat transfer and fluid friction characteristics in a heat exchanger tube. The turbulator is designed based on an elliptic shape suited to be made locally. The geometric dispersions caused by this kind of manufacturing process were surveyed, and then considered in the study. Hence 26 turbulators, manufactured with or without geometric dispersions, and with 45° or 60° ellipses, were tested in three tubes of different diameters. To ensure the closest possible resemblance to actual applications, the tests were carried out using air as a working fluid, with a low range of Reynolds number (1700-8000 for heat transfer and 3000 to 16,000 for friction factor). The heat transfer rate in a tube fitted with a turbulator may be increased up to 900%, in turbulent flow and with a curve angle of 45°. On the flip side, there is a very big pressure drop. However, a surface-based dispersion of 30% which could be generated by local manufacturing leads to a 50% reduction in the friction factor, but only a 20% reduction in the Nusselt number. The models obtained will enable a multi-criteria analysis for heat exchanger optimisation in a context specific to developing countries. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/575958/1/document_575958.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.applthermaleng.2015.01.078 10.1016/j.applthermaleng.2015.01.078 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.applthermaleng.2015.01.078 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.applthermaleng.2015.01.078 |
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Q02 - Traitement et conservation des produits alimentaires P05 - Ressources énergétiques et leur gestion énergie cinétique tourbillonnaire pays en développement échangeur de chaleur échange thermique traitement des aliments échange d'énergie http://aims.fao.org/aos/agrovoc/c_84b9f8a3 http://aims.fao.org/aos/agrovoc/c_2222 http://aims.fao.org/aos/agrovoc/c_11483 http://aims.fao.org/aos/agrovoc/c_3521 http://aims.fao.org/aos/agrovoc/c_37969 http://aims.fao.org/aos/agrovoc/c_2568 Q02 - Traitement et conservation des produits alimentaires P05 - Ressources énergétiques et leur gestion énergie cinétique tourbillonnaire pays en développement échangeur de chaleur échange thermique traitement des aliments échange d'énergie http://aims.fao.org/aos/agrovoc/c_84b9f8a3 http://aims.fao.org/aos/agrovoc/c_2222 http://aims.fao.org/aos/agrovoc/c_11483 http://aims.fao.org/aos/agrovoc/c_3521 http://aims.fao.org/aos/agrovoc/c_37969 http://aims.fao.org/aos/agrovoc/c_2568 |
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Q02 - Traitement et conservation des produits alimentaires P05 - Ressources énergétiques et leur gestion énergie cinétique tourbillonnaire pays en développement échangeur de chaleur échange thermique traitement des aliments échange d'énergie http://aims.fao.org/aos/agrovoc/c_84b9f8a3 http://aims.fao.org/aos/agrovoc/c_2222 http://aims.fao.org/aos/agrovoc/c_11483 http://aims.fao.org/aos/agrovoc/c_3521 http://aims.fao.org/aos/agrovoc/c_37969 http://aims.fao.org/aos/agrovoc/c_2568 Q02 - Traitement et conservation des produits alimentaires P05 - Ressources énergétiques et leur gestion énergie cinétique tourbillonnaire pays en développement échangeur de chaleur échange thermique traitement des aliments échange d'énergie http://aims.fao.org/aos/agrovoc/c_84b9f8a3 http://aims.fao.org/aos/agrovoc/c_2222 http://aims.fao.org/aos/agrovoc/c_11483 http://aims.fao.org/aos/agrovoc/c_3521 http://aims.fao.org/aos/agrovoc/c_37969 http://aims.fao.org/aos/agrovoc/c_2568 Rivier, Michel Sebastian, Patrick Goli, Thierry Raffray, Guilhem Collignan, Antoine Heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries |
description |
Energy availability, heat conversion and transfer still represent an impediment to the food processing sector in developing countries. Optimisation of tubular heat exchangers remains a concern for equipment designers and manufacturers. This work assesses the performances of a turbulator in terms of heat transfer and fluid friction characteristics in a heat exchanger tube. The turbulator is designed based on an elliptic shape suited to be made locally. The geometric dispersions caused by this kind of manufacturing process were surveyed, and then considered in the study. Hence 26 turbulators, manufactured with or without geometric dispersions, and with 45° or 60° ellipses, were tested in three tubes of different diameters. To ensure the closest possible resemblance to actual applications, the tests were carried out using air as a working fluid, with a low range of Reynolds number (1700-8000 for heat transfer and 3000 to 16,000 for friction factor). The heat transfer rate in a tube fitted with a turbulator may be increased up to 900%, in turbulent flow and with a curve angle of 45°. On the flip side, there is a very big pressure drop. However, a surface-based dispersion of 30% which could be generated by local manufacturing leads to a 50% reduction in the friction factor, but only a 20% reduction in the Nusselt number. The models obtained will enable a multi-criteria analysis for heat exchanger optimisation in a context specific to developing countries. |
format |
article |
topic_facet |
Q02 - Traitement et conservation des produits alimentaires P05 - Ressources énergétiques et leur gestion énergie cinétique tourbillonnaire pays en développement échangeur de chaleur échange thermique traitement des aliments échange d'énergie http://aims.fao.org/aos/agrovoc/c_84b9f8a3 http://aims.fao.org/aos/agrovoc/c_2222 http://aims.fao.org/aos/agrovoc/c_11483 http://aims.fao.org/aos/agrovoc/c_3521 http://aims.fao.org/aos/agrovoc/c_37969 http://aims.fao.org/aos/agrovoc/c_2568 |
author |
Rivier, Michel Sebastian, Patrick Goli, Thierry Raffray, Guilhem Collignan, Antoine |
author_facet |
Rivier, Michel Sebastian, Patrick Goli, Thierry Raffray, Guilhem Collignan, Antoine |
author_sort |
Rivier, Michel |
title |
Heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries |
title_short |
Heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries |
title_full |
Heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries |
title_fullStr |
Heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries |
title_full_unstemmed |
Heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries |
title_sort |
heat transfer enhancement of a circular tube heat exchanger fitted with an elliptic shaped turbulator designed in the context of developing countries |
url |
http://agritrop.cirad.fr/575958/ http://agritrop.cirad.fr/575958/1/document_575958.pdf |
work_keys_str_mv |
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