Question

4.1 Calculate the length of the turbulent diffusion flame formed when pure methane is released at high pressure through a nozzle 0.1 m in diameter. Assume that the flame temperature for methane is 1875°C (Lewis and von Elbe, 1987) and the ambient temperature is 20°C. What would the length be if the nozzle fluid consisted of 50% methane in air?

Answer 1

Share (is is at nozzle 2 entry exit into atmosphere stok (2) is at nozzle NOZ2ie Cyiven dota at state ( star (2) por Temperature (T) = 1875 → Temperature z (Tarzoc Applying steady flow energy ega in nozzle b/w store ① and ② mass flow rore Doing anolysis for unit hit wi2) = (ha tuz 2022 Chicha) t 0,2 모 Cp (Ti atz) tvir دده ى 209 تردد 2 20 Assuming constant specific hear and calculating at overal temp, (ap) methane z 4.348 kJ/kg k 4.348 (1875-20) + ابا 2 2222 Assuming ,nitial velsolycu 12. = Lol6.35m/s Relation for calculation of flame length is - 141 Freund wo) where frood no = 2 2 1. 64X1o7 gd 14800 1.64x107) 0.2] 38.84 meter