Study on regular and mechanism of coal bed methane desorption experiment under sonic vibrating of cavitation water jets
Abstract：Gas disasters are brought out in mines of most parts of China due to its high absorption,high pressure,low permeability and extraction difficulties.A new idea was put forward to promote gas desorption by sonic vibration effects of cavitation water jets.Studied on mechanism of gas-liquid phase transition and gas desorption promotion via sonic vibrating of cavitation water jets.Meanwhile,also studied on regular of the strengthened gas desorption on the premise of different cavitation coefficient by verifying pump pressure.The experiment result indicates that sonic vibration frequency range is quite wide when cavitation bubbles are broken,concentrating between 2 000～10 000 Hz.The vibration peak appeared between 5 400～6 800 Hz suggests that more bubble intensively perish within this extent.Sonic vibrating of cavitation water jets can promote coal bed methane desorption.In comparison with coal desorption which is not composed of cavitation,coal desorption costs 19.6% less time and attains 36.9% more amount when 0.020 0（pump pressure 15 MPa,confining pressure 0.3 MPa） sonic vibrating of cavitation water jets is offered.
Keywords：cavitation water jetseffects of sonic vibratinggasdesorption
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)