Next Article in Journal
Postharvest UV-B and Photoperiod with Blue + Red LEDs as Strategies to Stimulate Carotenogenesis in Bell Peppers
Previous Article in Journal
Unsupervised Cell Segmentation and Labelling in Neural Tissue Images
Previous Article in Special Issue
Investigation of Integral and Differential Characteristics of Variatropic Structure Heavy Concretes by Ultrasonic Methods
Article

Which Is the Motion State of a Droplet on an Inclined Hydrophilic Rough Surface in Gravity: Pinned or Sliding?

1
Key Laboratory of E&M, Zhejiang University of Technology, Ministry of Education & Zhejiang Province, Hangzhou 310023, China
2
State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ivan A. Parinov
Appl. Sci. 2021, 11(9), 3734; https://doi.org/10.3390/app11093734
Received: 25 March 2021 / Revised: 16 April 2021 / Accepted: 18 April 2021 / Published: 21 April 2021
(This article belongs to the Special Issue Physics and Mechanics of New Materials and Their Applications 2020)
The motion state of a droplet on an inclined, hydrophilic rough surface in gravity, pinned or sliding, is governed by the balance between the driving and the pinned forces. It can be judged by the droplet’s shape on the inclined hydrophilic rough surface and the droplet’s contact angle hysteresis. In this paper, we used the minimum energy theory, the minimum energy dissipation theory, and the nonlinear numerical optimization algorithm to establish Models 1–3 to calculate out the advancing/receding contact angles (θa/θr), the initial front/rear contact angles (θ10/θ20) and the dynamic front/rear contact angles (θ1*/θ2*) for a droplet on a rough surface. Also, we predicted the motion state of the droplet on an inclined hydrophilic rough surface in gravity by comparing θ10(θ20) and θ1*(θ2*) with θa(θr). Experiments were done to verify the predictions. They showed that the predictions were in good agreement with the experimental results. These models are promising as novel design approaches of hydrophilic functional rough surfaces, which are frequently applied to manipulate droplets in microfluidic chips. View Full-Text
Keywords: droplet; inclined hydrophilic rough surface; pinned; sliding; droplet shape; droplet contact angle hysteresis droplet; inclined hydrophilic rough surface; pinned; sliding; droplet shape; droplet contact angle hysteresis
Show Figures

Figure 1

MDPI and ACS Style

Dong, J.; Guo, Y.; Jiao, L.; Si, C.; Bian, Y.; Zhang, Z.; Hu, J. Which Is the Motion State of a Droplet on an Inclined Hydrophilic Rough Surface in Gravity: Pinned or Sliding? Appl. Sci. 2021, 11, 3734. https://doi.org/10.3390/app11093734

AMA Style

Dong J, Guo Y, Jiao L, Si C, Bian Y, Zhang Z, Hu J. Which Is the Motion State of a Droplet on an Inclined Hydrophilic Rough Surface in Gravity: Pinned or Sliding? Applied Sciences. 2021; 11(9):3734. https://doi.org/10.3390/app11093734

Chicago/Turabian Style

Dong, Jian, Youhai Guo, Long Jiao, Chao Si, Yinbo Bian, Zheng Zhang, and Jianliang Hu. 2021. "Which Is the Motion State of a Droplet on an Inclined Hydrophilic Rough Surface in Gravity: Pinned or Sliding?" Applied Sciences 11, no. 9: 3734. https://doi.org/10.3390/app11093734

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop