Mathematical Modeling of the Gas Dynamic Parameters of Impinging Heat-Transfer Medium Jet in Borehole Thermal Reaming Process - A. F. Bulat; O. I. Voloshyn; Yu. Potapchuk; V. I. Yemelianenko; M. M. Zhovtonoha; O. V. Zhevzhyk; S. Manigandan (Science and innovation, 2019)