A Numerical Simulation of Coalbed Methane Desorption and Diffusion Enhanced by Ultrasound Heating
YI Jun ,JIANG Yong dong,XIAN Xue fu and ZHANG Yu
DOI:10.11835/j.issn.1674-4764.2008.04.022
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,2008,Pages 99-104
- Abstract
We discuss the development of coal bed micro structure and the mechanism of enhancing the desorption/diffusion of coalbed methane by ultrasound. We present a mathematical model to describe the desorption/diffusion process of coalbed methane due to the ultrasound heating effect. Two cases of gas release with or without ultrasound fields in coal samples were simulated. We found that the temperature and the micropore diffusion coefficient of the system were improved by ultrasound transferred heat energy, while the dynamic fraction of free gas in pores was enhanced and the dynamic fraction of adsorbed gas was weakened.