Flow and heat transfer characteristics of triangular cylinder in a channel with low Reynolds number

The flow and heat transfer characteristics of air around the column were studied numerically for equilateral triangular cylinder with blockage ratios of 1/5, 1/4 and 1/3 in a two-dimensional horizontal channel, and the variation of drag coefficient, lift coefficient, Nusselt number and Strouhal number with Reynolds number were analyzed for different blockage ratios for top-angle windward and top-angle leeward arrangements. The study shows that the drag coefficient and lift coefficient of the trigonal top corner leeward arrangement are significantly larger than that of the top corner windward arrangement, and the rate of change of lift coefficient increases with the increase of obstruction ratio. When the obstruction ratio is 1/3, the two trailing rows of vortices appear to be staggered influence, and the drag coefficient and Strouhal number increase significantly. The Strouhal number basically tends to a constant value as the Reynolds number increases due to the joint influence of the channel and the column. The obstruction ratio increase has less effect on the Nusselt number and is much larger at the top corner windward than at the top corner leeward, with a maximum difference of 24.5%. Finally, the correlation equation of the Nusselt number criterion for the built-in trigonal channel winding is given. © 2021, Editorial Board of CIESC Journal. All right reserved.