These transition criterions are completed in horizontal or vertical pipes.Criterion in inclined pipes need to be studied further, it is one of the research direction in oil-water flow for the further.

• 这些转化准则大多针对水平管或垂直管，而对于倾斜管的转换准则，在理论和试验上还需要进一步研究，这也是油水两相流今后的研究方向。