Experimental Study on Permeability Evolution of Bituminous Coal Under ...
The testing system comprises a hightemperature, highpressure testing machine and a product collection and metering device (Shi et al. 2023). The hightemperature, highpressure testing machine used an internal heating method to heat the coal samples; the temperature range and heating rate were 20 ℃600 ℃ and ℃/min, respectively.