Hi,everybody. First thanks for your help. I am a beginer at combustion simulation. Recently I saw some papers about jet diffusion flame. In them the sentence that "the laminar jet diffusion flame length is proportion to the fuel exit velocity according to the paper of Roper (Roper F. G, Combustion and Flame, 29, 219 (1977))". I also look through this paper, but I can not find where the relationship gave. Could you tell me which formula in this paper shows the relationship between the jet flame length and fuel exit velocity? Thanks!