Numerical Study of Convection Heat Transfer in Staggered Tube Banks with Serrated Fins

Convection heat transfer in a combined cycle heatrecovery steam generator is modeled numerically. Fourstaggered rows of tubes with serrated fins are exposedto hot flue gas in cross flow. Three dimensionalgoverning equations with RNG k-ε model for turbulenceare solved using finite volume method. Velocity andtemperature distribution is investigated. Results showthat the second row has the best thermal performancewhile rate of heat transfer from the two last rows isapproximately half. Distribution of local heat transfercoefficient is also different for the tubes which is due tothe complex nature of three dimensional forcedconvection flows.

کلیدواژه ها:

Convection heat transfer ، HRSG ، Serratedfin ، Staggered layout