A CFD study of heat transfer through channel with Trapezoidal Rib


Author (s):

  1. Jagdish Singh Mehta, Graphic Era Hill University, Bhimtal, Utrakhand, India, jagdishmehta.03@gmail.com
  2. Rajesh Pant, Tula’s Institute of Technology, Dehradun, Utrakhand, India
  3. Satyendra Singh, Dwarahat, Dwarahat, Utrakhand, India

Abstract:

Improving efficiency with extremely little exhaust in a robust and cost efficient manner with higher life of components are of prime important factors that a contemporary industrial gas turbine have to compete with. Rough surfaces are widely used to increase convective heat transfer by supporting the advancement in turbulence levels. The most common technique employed for enhancement of heat transfer rate in an internal cooling passage of a gas turbine blade is using ribs at regular intervals because of their simple fabrication, operation and low maintenance. Ribs have got major applications in various chemical process plants, refrigeration, nuclear, heat exchangers and gas turbines. In this research work, a computational study has been carried out to investigate the heat transfer characteristics in rectangular duct roughened by trapezoidal shaped rib (increasing height in flow direction) using CFD (ANSYS/FLUENT). The main objectives of this work are mainly (1) to study the effect of variation in trapezoidal angle (a = 0 to 22.5) on the heat transfer characteristics and (2) to study the effect of Reynolds number (Re = 10000 to 20000) on heat transfer characteristics for different Trapezoidal angles. It has been observed that the wall with different taper angles shaped ribs have high average heat transfer coefficient as compared to corresponding square shape rib. So, this investigation suitably offers an improved rib design for internal fluid flow investigations related to cooling applications. The results clearly enlightened that the highest of Nusselt number is corresponding to the taper angles of 22.5 in upstream side and 7.5 in downstream side of the rib.

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