title: Wettability effect on nanoconfined water flow.
abstract: Understanding and controlling the flow of water confined in nanopores has tremendous implications in theoretical studies and industrial applications. Here, we propose a simple model for the confined water flow based on the concept of effective slip, which is a linear sum of true slip, depending on a contact angle, and apparent slip, caused by a spatial variation of the confined water viscosity as a function of wettability as well as the nanopore dimension. Results from this model show that the flow capacity of confined water is 10-1∼107times that calculated by the no-slip Hagen-Poiseuille equation for nanopores with various contact angles and dimensions, in agreement with the majority of 53 different study cases from the literature. This work further sheds light on a controversy over an increase or decrease in flow capacity from molecular dynamics simulations and experiments.
authors.affiliation: Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada; wukeliu19850109@163.com zhachen@ucalgary.ca.
authors.forename: Keliu
authors.identifier: 0000-0002-0021-5007
authors.initials: K
authors.lastname: Wu
authors.affiliation: Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada; wukeliu19850109@163.com zhachen@ucalgary.ca.
authors.forename: Zhangxin
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China.
authors.forename: Xiangfang
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.
authors.forename: Jinze
authors.initials: J
authors.lastname: Xu
authors.affiliation: Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.|Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China.
authors.forename: Xiaohu
authors.initials: X
authors.lastname: Dong
keywords: nanoconfined water flow; nanopores; slip; viscosity; wettability