Local Heat Transfer and flow Patterns During Condensation in a Single Silicon Microchannel.
Fiche publication
Date publication
décembre 2012
Auteurs
Membres identifiés du Cancéropôle Est :
Dr DE LABACHELERIE Michel
Tous les auteurs :
Odaymet A, Louahlia-Gualous H, De Labachelerie M
Lien Pubmed
Résumé
Condensation of steam in a single silicon microchannel was investigated using a simultaneous condensate flow visualization and heat transfer measurement along the flow direction. A silicon microchannel of a rectangular cross section covered with a transparent Pyrex glass was used. Different condensate flow patterns were identified, such as mist flow, churn flow, upstream elongated bubble flow followed by a bubble sequence, and slug flow. Both surface temperature measurements and video images obtained for different flows showed that the condensate flows were periodic or stable during time. The local surface temperature, local heat flux, and local heat transfer coefficient related to different condensate flow patterns were of particular interest. The local heat transfer coefficient was deduced from the local heat flux and the local surface temperature was measured through micro-instrumentation in a microchannel. The local thermal performance of condensation flow in a microchannel was better for mist flow and upstream elongated bubble flow relative to slug and bubbly flows.
Référence
Nanoscale Microscale Thermophys Eng. 2012 Dec 1;16(4):220-41.