Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4994621 | International Journal of Heat and Mass Transfer | 2017 | 11 Pages |
Abstract
In the present study, the heat transfer and flow performance in turbulent flow of the tube fitted with the drainage inserts are investigated. The results show that the new-type insert can lead the fluid at the core to the tube wall, strengthening the mixing of cold and hot fluid. And the insert also generates the vortex to make perturbation in the fluid domain. The experiment investigates the influence of pitch ratio on the Nusselt number and friction factor. The Nusselt number and friction factor both increase with the decrease of pitch ratio. And the pitch ratio of 3.3 is recommended for the insert. Some numerical results validated by the experimental results are also shown in the study to analyze the influence of slant angle on heat transfer and flow performance. The results indicate that 45° is suggested as the best slant angle for the insert. The numerical results of Nu/Nu0, f/f0 and PEC range from 1.82 to 1.94, 6.70 to 7.15 and 0.95 to 1.04, respectively, for the insert with the slant angle of 45Ë and the pitch ratio of 3.3. The results show that the insert is of good performance and the correlations of Nu and f are developed in the study.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Pengxiao Li, Peng Liu, Zhichun Liu, Wei Liu,