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SCIENCE CHINA Technological Sciences, Volume 60 , Issue 4 : 602-612(2017) https://doi.org/10.1007/s11431-016-0375-8

The numerical investigation of flow and heat transfer characteristics of flow past a slit-cylinder

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  • ReceivedMay 8, 2016
  • AcceptedNov 11, 2016
  • PublishedFeb 6, 2017

Abstract

The flow and heat transfer characteristics, including transition critical Reynolds number from two-dimensional to three-dimensional, the influence of slit-cylinder geometric parameter on Strouhal number, Nusselt number and forces acting on the slit-cylinder are numerically investigated. It’s found that transition critical Reynolds number from two-dimensional (flow wake deforms in two directions) to three-dimensional (flow wake deforms in three directions) increases with the augment of the slit width ratio in the range of present considered Reynolds number. The present results indicate that the three-dimensional vortex structures resulting from the deformation of the vortex shedding have significant effects on flow and heat transfer features such as Strouhal number, Nusselt number and forces acting on the cylinders with different ratios of slit width. It’s observed that the drag and lift coefficients reduce as the increase of slit width ratio, and vortex shedding is effectively suppressed by the slits. Moreover, the comprehensive heat transfer performance of the cylinder with the slits is significantly improved with the increase of the slit width ratio.


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