Maximum heat transfer rate density in two-dimensional minichannels and microchannels
| Autor: | Adrian Bejan, S. Le Person, Michel Favre-Marinet |
|---|---|
| Přispěvatelé: | Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] (LEGI), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Department of Electrical and Computer Engineering [Durham] (ECE), Duke University [Durham] |
| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Materials Science (miscellaneous) 020209 energy Flow (psychology) microfluidics Thermodynamics 02 engineering and technology Heat transfer coefficient [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Physics::Fluid Dynamics 020401 chemical engineering heat transfer 0202 electrical engineering electronic engineering information engineering General Materials Science [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] 0204 chemical engineering Dynamic scraped surface heat exchanger Chemistry Turbulence Mechanical Engineering Laminar flow Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Churchill–Bernstein equation Nusselt number Atomic and Molecular Physics and Optics microchannels Mechanics of Materials Heat transfer Micro heat exchanger 0210 nano-technology optimization |
| Zdroj: | 1st International Conference on Microchannels and Minichannels 1st International Conference on Microchannels and Minichannels, Apr 2003, Rochester, United States. pp.765-772, ⟨10.1115/ICMM2003-1100⟩ Microscale Thermophysical Engineering Microscale Thermophysical Engineering, Taylor & Francis, 2004, 8 (3), pp.225-237. ⟨10.1080/10893950490477419⟩ |
| ISSN: | 1089-3954 1091-7640 |
| Popis: | The objective of the present article is to compare previous experimental data of Gao et al. [20] to the predictions of Bejan and Sciubba's analysis [7] on the optimal spacing for maximum heat transfer from a package of parallel plates. Experimental investigations of the flow and the associated heat transfer were conducted in two-dimensional microchannels in order to test possible size effects on the laws of hydrodynamics and heat transfer and to infer optimal conditions of use from the measurements. The test section was designed to modify easily the channel height e between 1 mm and 0.1 mm. Measurements of the overall friction factor and local Nusselt numbers show that the classical laws of hydrodynamics and heat transfer are verified for e > 0.4 mm. For lower values of e, a significant decrease of the Nusselt number is observed, whereas the Poiseuille number continues to have the conventional value of laminar developed flow. The transition to turbulence is not affected by the channel size. The experimental data were processed by using the dimensionless parameters of Bejan and Sciubba's analysis [7]. For fixed pressure drop across the channel, a maximum of heat transfer rate density is found for a particular value of e. The corresponding dimensionless optimal spacing and heat transfer rate density are in very good agreement with the predictions of Bejan and Sciubba. This article reports the first time that the optimal spacing between parallel plates is determined experimentally. |
| Databáze: | OpenAIRE |
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