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A combined numerical and experimental study is conducted to test the heat  transfer enhancement and friction factor characteristics for a rectangular  duct fitted with three cases of ribs turbulators: continuous ribs (CR),  intermittent-continuous-intermittent ribs (ICIR) and intermittent ribs (IR).  Experiments are conducted within a turbulent flow for Reynolds numbers  values varied from 10000 to 35000, pitch ratio (p/e) equal to 5 and height  ratio (e/H) of 0.33. The numerical study carried out using ANSYS FlUENT17.2.  The turbulence is modeled by using k-ɛ model. The results showed that the  case of intermittent ribs provide the highest over performance factor while  the continuous ribs indicate less overall performance factor among the  considered cases. In addition, the results show that the highest values of  the friction factor are marked from the case of intermittent ribs (IR) and  then the case of intermittent-continuous-intermittent ribs (ICIR) followed  by continuous rib case (CR). The continuous rib case showed the lowest  friction factor. The experimental results showed a good agreement with the  computational results.

Experimental and computational investigation for three dimensional duct flow with modified arrangement ribs turbulators