Formation of sand ripples under a turbulent liquid flow
ARTIGO
Inglês
Agradecimentos: The author is grateful to FAPESP (Grant No. 2012/19562-6), to CNPq (Grant No. 471391/2013-1) and to FAEPEX/UNICAMP (conv. 519.292, project AP0008/2013) for the provided financial support
Sand ripples are commonly observed in both nature and industry. For example, they are found on riverbeds and in oil pipelines that transport sand. In both natural and industrial cases, ripples increase friction between the bed and fluid and are related to flooding, high pressure drops, and...
Sand ripples are commonly observed in both nature and industry. For example, they are found on riverbeds and in oil pipelines that transport sand. In both natural and industrial cases, ripples increase friction between the bed and fluid and are related to flooding, high pressure drops, and transients. Ripples appear when sediments are entrained as bed load (a mobile granular layer) and are usually considered to be the result of initial bedforms that eventually saturate. Given the small aspect ratio of the initial bedforms, linear analyses can be used to understand the formation of ripples. This paper presents a linear stability analysis of a granular bed under a turbulent flow of a liquid. This analysis takes into consideration all the main mechanisms and parameters involved in the turbulent liquid case, including some important parameters that have not yet been considered together such as the bed compactness and the bed-load threshold shear stress. The results of this analysis are compared with published experimental results and they show good agreement
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
471391/2013-1
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2012/19562-6
Fechado
Formation of sand ripples under a turbulent liquid flow
Formation of sand ripples under a turbulent liquid flow
Fontes
Applied mathematical modelling Vol. 39, no. 23-24 (Dec., 2015), p. 7390-7400 |