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Heat-transfer performance of twisted tubes for highly viscous food waste slurry from biogas plants

BACKGROUND: The use of food waste as feedstock shows high production of biogas via anaerobic digestion, but requires efficient heat transfer in food waste slurry at heating and cooling processes. The lack of rheological properties hampered the research on the heat-transfer process for food waste slu...

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Autores principales: Chen, Jingjing, Risberg, Mikael, Westerlund, Lars, Jansson, Urban, Wang, Changsong, Lu, Xiaohua, Ji, Xiaoyan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9261055/
https://www.ncbi.nlm.nih.gov/pubmed/35794672
http://dx.doi.org/10.1186/s13068-022-02156-4
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author Chen, Jingjing
Risberg, Mikael
Westerlund, Lars
Jansson, Urban
Wang, Changsong
Lu, Xiaohua
Ji, Xiaoyan
author_facet Chen, Jingjing
Risberg, Mikael
Westerlund, Lars
Jansson, Urban
Wang, Changsong
Lu, Xiaohua
Ji, Xiaoyan
author_sort Chen, Jingjing
collection PubMed
description BACKGROUND: The use of food waste as feedstock shows high production of biogas via anaerobic digestion, but requires efficient heat transfer in food waste slurry at heating and cooling processes. The lack of rheological properties hampered the research on the heat-transfer process for food waste slurry. Referentially, the twisted hexagonal and elliptical rubes have been proved as the optimal enhanced geometry for heat transfer of medium viscous slurries with non-Newtonian behavior and Newtonian fluids, respectively. It remains unknown whether improvements can be achieved by using twisted geometries in combination with food waste slurry in processes including heating and cooling. RESULTS: Food waste slurry was observed to exhibit highly viscous, significant temperature-dependence, and strongly shear-thinning rheological characteristics. Experiments confirmed the heat-transfer enhancement of twisted hexagonal tubes for food waste slurry and validated the computational fluid dynamics-based simulations with an average deviation of 14.2%. Twisted hexagonal tubes were observed to be more effective at low-temperature differences and possess an enhancement factor of up to 2.75; while twisted elliptical tubes only exhibited limited heat-transfer enhancement at high Reynolds numbers. The heat-transfer enhancement achieved by twisted hexagonal tubes was attributed to the low dynamic viscosity in the boundary layer induced by the strong and continuous shear effect near the walls of the tube. CONCLUSIONS: This study determined the rheological properties of food waste slurry, confirmed the heat-transfer enhancement of the twisted hexagonal tubes experimentally and numerically, and revealed the mechanism of heat-transfer enhancement based on shear rate distributions. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s13068-022-02156-4.
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spelling pubmed-92610552022-07-08 Heat-transfer performance of twisted tubes for highly viscous food waste slurry from biogas plants Chen, Jingjing Risberg, Mikael Westerlund, Lars Jansson, Urban Wang, Changsong Lu, Xiaohua Ji, Xiaoyan Biotechnol Biofuels Bioprod Research BACKGROUND: The use of food waste as feedstock shows high production of biogas via anaerobic digestion, but requires efficient heat transfer in food waste slurry at heating and cooling processes. The lack of rheological properties hampered the research on the heat-transfer process for food waste slurry. Referentially, the twisted hexagonal and elliptical rubes have been proved as the optimal enhanced geometry for heat transfer of medium viscous slurries with non-Newtonian behavior and Newtonian fluids, respectively. It remains unknown whether improvements can be achieved by using twisted geometries in combination with food waste slurry in processes including heating and cooling. RESULTS: Food waste slurry was observed to exhibit highly viscous, significant temperature-dependence, and strongly shear-thinning rheological characteristics. Experiments confirmed the heat-transfer enhancement of twisted hexagonal tubes for food waste slurry and validated the computational fluid dynamics-based simulations with an average deviation of 14.2%. Twisted hexagonal tubes were observed to be more effective at low-temperature differences and possess an enhancement factor of up to 2.75; while twisted elliptical tubes only exhibited limited heat-transfer enhancement at high Reynolds numbers. The heat-transfer enhancement achieved by twisted hexagonal tubes was attributed to the low dynamic viscosity in the boundary layer induced by the strong and continuous shear effect near the walls of the tube. CONCLUSIONS: This study determined the rheological properties of food waste slurry, confirmed the heat-transfer enhancement of the twisted hexagonal tubes experimentally and numerically, and revealed the mechanism of heat-transfer enhancement based on shear rate distributions. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s13068-022-02156-4. BioMed Central 2022-07-06 /pmc/articles/PMC9261055/ /pubmed/35794672 http://dx.doi.org/10.1186/s13068-022-02156-4 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/ (https://creativecommons.org/publicdomain/zero/1.0/) ) applies to the data made available in this article, unless otherwise stated in a credit line to the data.
spellingShingle Research
Chen, Jingjing
Risberg, Mikael
Westerlund, Lars
Jansson, Urban
Wang, Changsong
Lu, Xiaohua
Ji, Xiaoyan
Heat-transfer performance of twisted tubes for highly viscous food waste slurry from biogas plants
title Heat-transfer performance of twisted tubes for highly viscous food waste slurry from biogas plants
title_full Heat-transfer performance of twisted tubes for highly viscous food waste slurry from biogas plants
title_fullStr Heat-transfer performance of twisted tubes for highly viscous food waste slurry from biogas plants
title_full_unstemmed Heat-transfer performance of twisted tubes for highly viscous food waste slurry from biogas plants
title_short Heat-transfer performance of twisted tubes for highly viscous food waste slurry from biogas plants
title_sort heat-transfer performance of twisted tubes for highly viscous food waste slurry from biogas plants
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9261055/
https://www.ncbi.nlm.nih.gov/pubmed/35794672
http://dx.doi.org/10.1186/s13068-022-02156-4
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