@Article{cmes.2020.08538,
AUTHOR = {Xiaofeng Yang, Yanhong Li, Aiguo Nie, Sheng Zhi, Liyuan Liu},
TITLE = {Numerical Study on Rock Breaking Mechanism of Supercritical CO<sub>2</sub> Jet Based on Smoothed Particle Hydrodynamics},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {122},
YEAR = {2020},
NUMBER = {3},
PAGES = {1141--1157},
URL = {http://www.techscience.com/CMES/v122n3/38391},
ISSN = {1526-1506},
ABSTRACT = {Supercritical carbon dioxide (Sc-CO<sub>2</sub>) jet rock breaking is a nonlinear impact 
dynamics problem involving many factors. Considering the complexity of the physical 
properties of the Sc-CO<sub>2</sub> jet and the mesh distortion problem in dealing with large 
deformation problems using the finite element method, the smoothed particle 
hydrodynamics (SPH) method is used to simulate and analyze the rock breaking process 
by Sc-CO<sub>2</sub> jet based on the derivation of the jet velocity-density evolution mathematical 
model. The results indicate that there exisits an optimal rock breaking temperature by Sc-CO<sub>2</sub>. The volume and length of the rock fracture increase with the rising of the jet 
temperature but falls when the jet temperature exceeds 340 K. With more complicated 
perforation shapes and larger fracture volumes, the Sc-CO<sub>2</sub> jet can yield a rock breaking 
more effectively than water jet, The stress analysis shows that the Sc-CO<sub>2</sub> rock fracturing 
process could be reasonably divided into three stages, namely the fracture accumulation 
stage, the rapid failure stage, and the breaking stabilization stage. The high diffusivity of 
Sc-CO<sub>2</sub> is identified as the primary cause of the stress fluctuation and W-shaped fracture 
morphology. The simulated and calculated results are generally in conformity with the 
published experimental data. This study provides theoretical guidance for further study 
on Sc-CO<sub>2</sub> fracturing mechanism and rock breaking efficiency.},
DOI = {10.32604/cmes.2020.08538}
}