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Consider a semi-infinite fuel surface with leading edge located at  and let the free stream oxidizer velocity be . Through the solution  of Blasius equation  ( is the self-similar Howarth–Dorodnitsyn coordinate), the mass flux  ( is density and  is vertical velocity) in the vertical direction can be obtained
where 
In deriving this, it is assumed that the density  and the viscosity , where  is the temperature. The subscript  describes the values far away from the fuel surface. The main interest in combustion process is the fuel burning rate, which is obtained by evaluating  at , as given below,