title: On the migration of a droplet on an incline.
abstract: A liquid droplet placed on a nonuniformly heated solid surface will migrate from a high temperature region to a low temperature region. The present study reports the results of an experimental investigation on the migration behavior of mineral oil droplets subjected to a thermal gradient on an inclined plane. A particular attention is paid to the relationship between the critical inclination angle and thermal gradients. It is shown that there exists a critical inclination angle at which the droplet migration is halted. This critical inclination angle can be readily predicted using analytical expressions derived in this paper. This study puts forward the understanding of the interface phenomenon of thermocapillary migration on an incline. The knowledge of the critical inclination is important in applications where the migration on an incline must be obstructed to retain adequate lubrication in the desired location.
authors.affiliation: College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China; Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing 210016, China.
authors.forename: Qingwen
authors.initials: Q
authors.lastname: Dai
authors.affiliation: Department of Mechanical and Industrial Engineering, Louisiana State University, 3283 Patrick Taylor Hall, Baton Rouge, LA 70803, USA. Electronic address: khonsari@me.lsu.edu.
authors.forename: M M
authors.initials: MM
authors.lastname: Khonsari
authors.affiliation: Department of Mechanical and Industrial Engineering, Louisiana State University, 3283 Patrick Taylor Hall, Baton Rouge, LA 70803, USA.
authors.forename: Cong
authors.initials: C
authors.lastname: Shen
authors.affiliation: College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.affiliation: College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China; Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing 210016, China.
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Wang
keywords: Inclination angle; Lubrication approximation; Surface tension; Thermocapillary migration