000198759 001__ 198759
000198759 005__ 20181203023506.0
000198759 0247_ $$2doi$$a10.1016/S1001-6058(14)60032-9
000198759 02470 $$2ISI$$a000335366400014
000198759 037__ $$aARTICLE
000198759 245__ $$aTwo-phase air-water flows: Scale effects in physical modelling
000198759 269__ $$a2014
000198759 260__ $$aNew York$$bElsevier Science Inc$$c2014
000198759 300__ $$a8
000198759 336__ $$aJournal Articles
000198759 500__ $$a[970]
000198759 520__ $$aPhysical modeling represents probably the oldest design tool in hydraulic engineering together with analytical approaches. In free surface flows, the similitude based upon a Froude similarity allows for a correct representation of the dominant forces, namely gravity and inertia. As a result fluid flow properties such as the capillary forces and the viscous forces might be incorrectly reproduced, affecting the air entrainment and transport capacity of a high-speed model flow. Small physical models operating under a Froude similitude systematically underestimate the air entrainment rate and air-water interfacial properties. To limit scale effects, minimal values of Reynolds or Weber number have to be respected. The present article summarizes the physical background of such limitations and their combination in terms of the Morton number. Based upon a literature review, the existing limits are presented and discussed, resulting in a series of more conservative recommendations in terms of air concentration scaling. For other air-water flow parameters, the selection of the criteria to assess scale effects is critical because some parameters (e.g., bubble sizes, turbulent scales) can be affected by scale effects, even in relatively large laboratory models.
000198759 6531_ $$aair entrainment
000198759 6531_ $$ahydraulic structures
000198759 6531_ $$aphysical modeling
000198759 6531_ $$ascale effects
000198759 6531_ $$atwo-phase flow
000198759 6531_ $$aMorton number
000198759 700__ $$0244418$$aPfister, Michael$$g202221
000198759 700__ $$aChanson, Hubert
000198759 773__ $$j26$$k2$$q291-298$$tJournal of Hydrodynamics
000198759 8564_ $$s725327$$uhttps://infoscience.epfl.ch/record/198759/files/2014-970_Pfister_Chanson_Two_phase_air_water_flows_Scale_effects_in_physical_modeling.pdf$$yn/a$$zn/a
000198759 909C0 $$0252079$$pLCH$$xU10263
000198759 909C0 $$0255473$$pPL-LCH$$xU10263
000198759 909CO $$ooai:infoscience.tind.io:198759$$particle$$pENAC
000198759 917Z8 $$x206365
000198759 917Z8 $$x202221
000198759 937__ $$aEPFL-ARTICLE-198759
000198759 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000198759 980__ $$aARTICLE