Pattern transitions of oil-water two-phase flow with low water content in rectangular horizontal pipes probed by terahertz spectrum Feng, Xin ; Wu, Shi-Xiang ; Zhao, Kun ; Wang, Wei ; Zhan, Hong-Lei ; Jiang, Chen ; Xiao, Li-Zhi ; Chen, Shao-Hua Abstract Publication: Optics Express Pub Date: November 2015 DOI: 10.1364/OE.23.0A1693 Bibcode: 2015OExpr..23A1693F