TY - JOUR
TI - Numerical simulation study on rock breakage by low temperature jet impact
AU - Wang Hu
AU - Hu Yong
AU - Cai Cheng-Zheng
AU - Wang Bo
AU - Lyv Yi
JN - Thermal Science
PY - 2025
VL - 29
IS - 2
SP - 1503
EP - 1508
PT - Article
AB - A 3-D model with specific parameters was established, utilizing the conjugate  heat transfer method to calculate heat exchange between the rock and fluid,  and the smoothed particle hydrodynamics-finite element method approach to  simulate rock fragmentation. Upon contact, the liquid nitrogen jet induced  significant heat exchange, with the 25 MPa jet showing larger contact area  and higher efficiency. Notably, the impact center of the 400°C rock  exhibited a slight temperature rise due to energy release. Liquid nitrogen  reduced the rock's tensile, compressive strengths, and elastic modulus. High  temperature rocks (400°C) had a 15.8% higher eroded volume fraction than  those at 200°C. Increasing jet pressure from 20-25 MPa resulted in a 32.0%  erosion increase. Additionally, a decrease in elastic modulus for 200°C  granite led to a 19.9% increase in erosion.