Experimental investigation on the heat transfer of an impinging inverse diffusion flame

It was found that, for the impinging IDF, for Φ of 1.2 or higher, the area-averaged heat flux increased as the Reair or Φ was increased while the heat transfer efficiency decreased when these two parameters increased. Thus for the IDF, the maximum heat transfer efficiency occurred at Reair = 2000 and Φ = 1.2. At lower Φ, the heat transfer efficiency could increase when Φ was decreased. For the range of H/dIDF investigated, there was certain variation in the heat transfer efficiency with H/dIDF. The heat transfer efficiency of the premixed flame has a peak value at Φ = 1.0 at H/dP = 2 and decreases at higher Φ and higher H/dP. The IDF could have comparable or even higher heat transfer efficiency than a premixed flame.