A multi-scale hybrid approach to the modelling and design of a novel micro-channel cooling structure for the W7X divertor
The second operating phase of the W7X stellarator, with an expanded set of plasma-facing components, includes the test of divertor tiles with a continuous heat load reaching 10 MW/m2. The divertor tiles are cooled by subcooled water. Here a novel cooling concept, based on a network of parallel array...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-02-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X23000400 |
| _version_ | 1797936403617677312 |
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| author | Hossein Ebadi Francesco Carrone Rosa Difonzo Joris Fellinger Heinrich P. Laqua Niko Schneider Laura Savoldi |
| author_facet | Hossein Ebadi Francesco Carrone Rosa Difonzo Joris Fellinger Heinrich P. Laqua Niko Schneider Laura Savoldi |
| author_sort | Hossein Ebadi |
| collection | DOAJ |
| description | The second operating phase of the W7X stellarator, with an expanded set of plasma-facing components, includes the test of divertor tiles with a continuous heat load reaching 10 MW/m2. The divertor tiles are cooled by subcooled water. Here a novel cooling concept, based on a network of parallel arrays of micro-channels (MC) with sub-millimetre dimensions, is investigated on a 0.1 m × 0.1 m tile, realizable by Additive Manufacturing. Detailed CFD simulations of the mock-up are performed to check the cooling uniformity using a multi-scale approach, aiming at limiting the dimension of the computational grid without a major loss of accuracy. First, the detailed hydraulic and thermal characterization on a sub-domain with of a small group of MC is performed. Then, the block of MC is substituted with an equivalent porous strip (PS), calibrating the hydraulic and thermal characteristics of the porous medium. The model is verified on an array of MCs or PSs connected to the same manifolds, showing the capability to reproduce the pressure drop and temperature increase with maximum errors of 1.05% and ∽20% in nominal conditions, respectively. The numerical model of the entire tile equipped with PSs is then reliably adopted to evaluate the thermal-hydraulic performance of the cooling device. |
| first_indexed | 2024-04-10T18:29:15Z |
| format | Article |
| id | doaj.art-ce96bac64a564f0f980b9241dadb0da6 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-04-10T18:29:15Z |
| publishDate | 2023-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-ce96bac64a564f0f980b9241dadb0da62023-02-02T04:48:39ZengElsevierCase Studies in Thermal Engineering2214-157X2023-02-0142102734A multi-scale hybrid approach to the modelling and design of a novel micro-channel cooling structure for the W7X divertorHossein Ebadi0Francesco Carrone1Rosa Difonzo2Joris Fellinger3Heinrich P. Laqua4Niko Schneider5Laura Savoldi6MAHTEP Group, Dipartimento Energia “Galileo Ferraris”, Politecnico di Torino, Torino, ItalyMAHTEP Group, Dipartimento Energia “Galileo Ferraris”, Politecnico di Torino, Torino, Italy; Max-Planck-Institute for Plasma Physics, Greifswald, GermanyMAHTEP Group, Dipartimento Energia “Galileo Ferraris”, Politecnico di Torino, Torino, ItalyMax-Planck-Institute for Plasma Physics, Greifswald, GermanyMax-Planck-Institute for Plasma Physics, Greifswald, GermanyMax-Planck-Institute for Plasma Physics, Greifswald, GermanyMAHTEP Group, Dipartimento Energia “Galileo Ferraris”, Politecnico di Torino, Torino, Italy; Corresponding author.The second operating phase of the W7X stellarator, with an expanded set of plasma-facing components, includes the test of divertor tiles with a continuous heat load reaching 10 MW/m2. The divertor tiles are cooled by subcooled water. Here a novel cooling concept, based on a network of parallel arrays of micro-channels (MC) with sub-millimetre dimensions, is investigated on a 0.1 m × 0.1 m tile, realizable by Additive Manufacturing. Detailed CFD simulations of the mock-up are performed to check the cooling uniformity using a multi-scale approach, aiming at limiting the dimension of the computational grid without a major loss of accuracy. First, the detailed hydraulic and thermal characterization on a sub-domain with of a small group of MC is performed. Then, the block of MC is substituted with an equivalent porous strip (PS), calibrating the hydraulic and thermal characteristics of the porous medium. The model is verified on an array of MCs or PSs connected to the same manifolds, showing the capability to reproduce the pressure drop and temperature increase with maximum errors of 1.05% and ∽20% in nominal conditions, respectively. The numerical model of the entire tile equipped with PSs is then reliably adopted to evaluate the thermal-hydraulic performance of the cooling device.http://www.sciencedirect.com/science/article/pii/S2214157X23000400Additive manufacturingMicro-channelsCoolingModellingPorous mediumDivertor |
| spellingShingle | Hossein Ebadi Francesco Carrone Rosa Difonzo Joris Fellinger Heinrich P. Laqua Niko Schneider Laura Savoldi A multi-scale hybrid approach to the modelling and design of a novel micro-channel cooling structure for the W7X divertor Case Studies in Thermal Engineering Additive manufacturing Micro-channels Cooling Modelling Porous medium Divertor |
| title | A multi-scale hybrid approach to the modelling and design of a novel micro-channel cooling structure for the W7X divertor |
| title_full | A multi-scale hybrid approach to the modelling and design of a novel micro-channel cooling structure for the W7X divertor |
| title_fullStr | A multi-scale hybrid approach to the modelling and design of a novel micro-channel cooling structure for the W7X divertor |
| title_full_unstemmed | A multi-scale hybrid approach to the modelling and design of a novel micro-channel cooling structure for the W7X divertor |
| title_short | A multi-scale hybrid approach to the modelling and design of a novel micro-channel cooling structure for the W7X divertor |
| title_sort | multi scale hybrid approach to the modelling and design of a novel micro channel cooling structure for the w7x divertor |
| topic | Additive manufacturing Micro-channels Cooling Modelling Porous medium Divertor |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X23000400 |
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