Local analysis of an increasing pin-fin density device under experimental flow boiling conditions
Pin-finned surfaces have emerged as a promising solution for flow boiling technology, with population density identified as an interesting design parameter for enhancing heat transfer and suppressing flow instabilities. This work presents an experimental study of an increasing variable density pin-f...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:10459.1/468754 |
| Acceso en línea: | https://doi.org/10.1016/j.ijthermalsci.2025.110251 https://hdl.handle.net/10459.1/468754 http://hdl.handle.net/10459.1/468754 |
| Access Level: | acceso abierto |
| Palabra clave: | Flow boiling Pin-fins Jet-impingement |
| Sumario: | Pin-finned surfaces have emerged as a promising solution for flow boiling technology, with population density identified as an interesting design parameter for enhancing heat transfer and suppressing flow instabilities. This work presents an experimental study of an increasing variable density pin-finned surface combined with jet-impingement technology under flow boiling conditions. At a constant inlet temperature of 75 °C, flow rates of 100 and 200 ml/min of deionized water were conducted under heat fluxes of almost 60 W/cm2. The major innovation of this work relies on the extensive local study of bubble dynamics, flow patterns, heat transfer and boiling curves. A total of 7 thermocouples were distributed in 5 different regions to obtain a thermal characterization of the heatsink behalf along the flow path. Results show that, for a given thermal load, the cooling device can operate in multiple flow regimes within different regions, each influencing both global and local heat transfer accordingly. A heat transfer enhancement of over 30 % and 10 % across the heatsink was achieved for the 100 ml/min and 200 ml/min flow rate tests, respectively. Quantitatively, the maximum local heat transfer coefficient (hth,i) was 7320 and 10890 W/°C·m2. For the onset of nucleate boiling (ONB), which occurred at 12.93 W/cm2 and 22.81 W/cm2 respectively, the wall superheat ranged from 0.54 °C to 2.69 °C and from 0.91 °C to 4.27 °C. The critical heat flux (CHF) was reached at 32.34 W/cm2 and 58.11 W/cm2. Authors stated that a local flow boiling analysis provides a comprehensive heatsink cooling performance that would allow a better heatsink design optimization. |
|---|