Clogging of Soft Particles in a 2D Hopper Open Access

Wang, Haoran (2017)

Permanent URL:


We study the flow of soft hydrogel particles out of a quasi-two dimensional hopper. The hopper chamber is set thin enough for all the particles to stay in one plane without overlapping with each other. Since hydrogels have a significantly low friction coefficient, the system is considered as a frictionless system. We examine the probability of a clog forming as the particles flow out, as a function of the ratio of the size of hopper exit vs. the average diameter of the particles. We find that clogging of these soft particles requires the hopper exit to be quite small, only about twice larger than the particle diameter. Also, we observe the clogging probability increases as we reduce the influence of gravity (by tilting the hopper chamber away from vertical). The clogging happens more often when the exit is slightly larger than the size of the particles, which is much different from the observation of hard particles.

Table of Contents

1: Introduction 1

2: Literature Review 3

3: Methodology 10

4: Results 17

5: Summary and Discussions 21

6: Bibliography 23

About this Honors Thesis

Rights statement
  • Permission granted by the author to include this thesis or dissertation in this repository. All rights reserved by the author. Please contact the author for information regarding the reproduction and use of this thesis or dissertation.
  • English
Research Field
Committee Chair / Thesis Advisor
Committee Members
Last modified

Primary PDF

Supplemental Files