The Open Mechanical Engineering Journal

2014, 8 : 974-976
Published online 2014 December 31. DOI: 10.2174/1874155X01408010974
Publisher ID: TOMEJ-8-974

Research on Backflow Region Length of Sudden-Enlarge Oil Tube Flows

Jiahong Wang and Wanzheng Ai
Institute of Navigation, University of Zhejiang Ocean, No.1 South Road, Dinghai District, Zhoushan, 316022, P.R. China.

ABSTRACT

Sudden-enlarge tube has important applications in reality lives. The backflow region length in sudden-enlarge tube flows is closely related with its energy loss. In this paper, the characteristics of backflow region length in suddenenlarge oil tube flows are researched. The results show that backflow region length decreases with the increase of the contraction ratio; when Reynolds number is more than 105, Reynolds number have little impacts on backflow region length. Empirical expression about backflow region length is also obtained by fitting curve in this paper.

Keywords:

Backflow region, Contraction ratio, Reynolds number, Simulations, Transportation in tube.