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van Nimwegen, A.T. (author), Portela, L. (author), Henkes, R.A.W.M. (author)In this work, we extend our previous efforts on the effect of surfactants on air-water flow in a vertical pipe by also considering pipe inclinations between 20° (with respect to horizontal) and vertical. For air-water flow, independent of the inclination, there is a regular annular flow at large gas flow rates, and an irregular churn or slug...journal article 2016