�?�?t ρ l k + �?�?x i ρ l k v l = �?�?x j μ + μ t σ k �?k �?x j + G k �?ρ l ε �?Y M could be the outcome of compressible turbulent pulsation growth on the general dissipation charge, W/m3; and μ t This phenomenon suggests that, if the loss price of drilling fluid is regular, the return flow with the drilling fl