Publication

Unified Modeling Suite for Two-Phase Flow, Convective Boiling, and Condensation in Macro- and Microchannels

John Richard Thome, Andrea Cioncolini
2016
Conference Papers

Résumé

This paper focuses on the unified modeling suite for annular flow that the authors have developed and continue to develop. The annular flow suite currently includes models to predict the void fraction, the entrained liquid fraction, and the wall shear stress and pressure gradient, and a turbulence model for momentum and heat transport inside the annular liquid film. The turbulence model, in particular, allows prediction of the local average liquid film thicknesses and the local heat transfer coefficients during convective evaporation and condensation. The benefit of a unified modeling suite is that all the included prediction methods are consistently formulated and are proven to work well together, and provide a platform for continued advancement based on the other models in the suite. First the unified suite of methods is presented, illustrating in particular the most recent updates. Then results for the pressure drop and the heat transfer coefficient during convective evaporation and condensation are presented and discussed, covering both water and refrigerants flowing through circular tubes and noncircular multi-microchannel configurations for microelectronics cooling.

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https://infoscience.epfl.ch/entities/publication/16ffb43b-de16-48f2-b522-a15e49c228e5

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John Richard Thome, Andrea Cioncolini
2016
Conference Papers

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/16ffb43b-de16-48f2-b522-a15e49c228e5

À propos de ce résultat

Concepts associés (29)

Transfert thermique

vignette|alt=Autour d'un feu, des mains reçoivent sa chaleur par rayonnement (sur le côté), par convection (au-dessus de ses flammes) et par conduction (à travers un ustensile en métal).|Les modes de transfert thermique ( en anglais pour « rayonnement »). Un transfert thermique, appelé plus communément chaleur, est l'un des modes d'échange d'énergie interne entre deux systèmes, l'autre étant le travail : c'est un transfert d'énergie thermique qui s'effectue hors de l'équilibre thermodynamique.

Critical heat flux

In the study of heat transfer, critical heat flux (CHF) is the heat flux at which boiling ceases to be an effective form of transferring heat from a solid surface to a liquid. Boiling systems are those in which liquid coolant absorbs energy from a heated solid surface and undergoes a change in phase. In flow boiling systems, the saturated fluid progresses through a series of flow regimes as vapor quality is increased. In systems that utilize boiling, the heat transfer rate is significantly higher than if the fluid were a single phase (i.

Convection

La convection est l'ensemble des mouvements internes (verticaux ou horizontaux) qui animent un fluide et qui impliquent alors le transport des propriétés des particules de ce fluide au cours de son déplacement. Elle peut être due à des différences de température, une agitation mécanique, un pompage etc. Ce transfert implique l'échange de chaleur entre une surface et un fluide mobile à son contact, ou le déplacement de chaleur au sein d'un fluide par le mouvement d'ensemble de ses molécules d'un point à un autre.

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