“…Gnielinski [31] 𝑁𝑢 = ( 2 300 < Re < 10 6 , 0.6 < Pr < 10 5 Source data: [3,14,16,17,20,23,29,[32][33][34], [18,25,[35][36][37][38]]* (7) *It was not possible for the authors to confirm these references because of unavailability. [3] Water Ts Heating 10 107 -38 816 2.9 -3.1 Dittus and Boelter [2] Colburn [9] Sieder and Tate [19] Gnielinski [31] Gas [23] Water Ts Heating 4 113 -140 005 2.2 -8.9 Sieder and Tate [19] Gnielinski [31] Sherwood et al [17] Light hydrocarbon oil Ts Heating 280 -5 570 102 -221 Colburn [9] Sieder and Tate [19] Gnielinski [31] Sherwood and Petrie [16] Water Ts Heating 2 800 -113 000 3.9 -367 Colburn [9] Sieder and Tate [19] Gnielinski [31] Acetone Colburn [9] broke new ground by making use of dimensionless variables such as Reynolds, Prandtl and Nusselt number to reduce the number of variables in the calculation of the heat transfer coefficients.…”