TY JOUR TI THEORETICAL RECOMMENDATIONS FOR CHOOSING THE WALL THICKNESS OF A LIP SEAL OPERATING WITHOUT LUBRICATION KW lip seal KW gas flow in the gap KW mathematical model KW Ansys software module KW non-lubricate material JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Busarov, S.S. AU Roman, R.E. AU Sinicin, N.G. PY 2022 IS 7 PB Belgorod State Technological University named after V.G. Shukhov