Evgenjevich, L. I. Theory of Heat Exchange in Pipes With Turbulators With d/D = 0.95 ÷ 0.90 And t/D = 0.25 ÷ 1.00, and Also in Rough Pipes, by Air With Great Reynold’s Numbers Re = 106. j. of archit. environ. & struct. eng. res. 2020, 2, 1-10.