TY JOUR TI Analysis of Heat Exchange Processes on the Surface of the Aboveground Pipeline with Heat Insulation KW Above-ground pipeline KW heat insulation KW convective heat exchange KW heat transfer coefficient KW boundary condition KW mathematical model JO Bulletin of scientific research results AU Lapshin, V.F. PY 2023 IS 2023 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"