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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.