Arid
DOI10.1016/j.jhydrol.2015.09.048
Interactions of bluff-body obstacles with turbulent airflows affecting evaporative fluxes from porous surfaces
Haghighi, Erfan; Or, Dani
通讯作者Haghighi, Erfan
来源期刊JOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
出版年2015
卷号530页码:103-116
英文摘要

Bluff-body obstacles interacting with turbulent airflows are common in many natural and engineering applications (from desert pavement and shrubs over natural surfaces to cylindrical elements in compact heat exchangers). Even with obstacles of simple geometry, their interactions within turbulent airflows result in a complex and unsteady flow field that affects surface drag partitioning and transport of scalars from adjacent evaporating surfaces. Observations of spatio-temporal thermal patterns on evaporating porous surfaces adjacent to bluff-body obstacles depict well-defined and persistent zonation of evaporation rates that were used to construct a simple mechanistic model for surface-turbulence interactions. Results from evaporative drying of sand surfaces with isolated cylindrical elements (bluff bodies) subjected to constant turbulent airflows were in good agreement with model predictions for localized exchange rates. Experimental and theoretical results show persistent enhancement of evaporative fluxes from bluff-rough surfaces relative to smooth flat surfaces under similar conditions. The enhancement is attributed to formation of vortices that induce a thinner boundary layer over part of the interacting surface footprint. For a practical range of air velocities (0.5-4.0 m/s), low-aspect ratio cylindrical bluff elements placed on evaporating sand surfaces enhanced evaporative mass losses (relative to a flat surface) by up to 300% for high density of elements and high wind velocity, similar to observations reported in the literature. Concepts from drag partitioning were used to generalize the model and upscale predictions to evaporation from surfaces with multiple obstacles for potential applications to natural bluff-rough surfaces. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Evaporation Porous surface Bluff-body obstacle Turbulent airflow Momentum partitioning
类型Article
语种英语
国家Switzerland
收录类别SCI-E
WOS记录号WOS:000365050600009
WOS关键词LARGE-EDDY SIMULATION ; FINITE CIRCULAR-CYLINDER ; LOCAL MASS-TRANSFER ; LOW-ASPECT-RATIO ; BOUNDARY-LAYER ; HEAT-TRANSFER ; VISCOUS SUBLAYER ; BIDIRECTIONAL REFLECTANCE ; THERMAL SIGNATURES ; DRAG PARTITION
WOS类目Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Engineering ; Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/188810
作者单位ETH, Soil & Terr Environm Phys, Dept Environm Syst Sci, CH-8092 Zurich, Switzerland
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Haghighi, Erfan,Or, Dani. Interactions of bluff-body obstacles with turbulent airflows affecting evaporative fluxes from porous surfaces[J],2015,530:103-116.
APA Haghighi, Erfan,&Or, Dani.(2015).Interactions of bluff-body obstacles with turbulent airflows affecting evaporative fluxes from porous surfaces.JOURNAL OF HYDROLOGY,530,103-116.
MLA Haghighi, Erfan,et al."Interactions of bluff-body obstacles with turbulent airflows affecting evaporative fluxes from porous surfaces".JOURNAL OF HYDROLOGY 530(2015):103-116.
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