دانلود رایگان مقاله افزایش انتقال حرارت در کانال هوای خورشیدی با بافل متعدد نوع V

abstract

A current investigation deals with experimental analysis of the heat transfer behavior and optimum relative width parameter of the solar air channel of aspect ratio of 10.0 with 60° angled broken multiple V-type baffles. The current experiment enclosed a wide range of parameter such as Reynolds number varied from 3000 to 8000, relative width varied from 1.0 to 6.0, relative baffle height of 0.5, relative baffle pitch of 10.0, relative discrete distance of 0.67 and relative gap width of 1.0. The obtained experimental results showed that higher overall thermal performance occurred at a relative baffle width of 5.0. Also, the results reveal that the broken multiple V-type baffles are thermo-hydraulically superior as compared to the other baffles shaped solar air channel.

8. Conclusion

This experimental examination of Nurs, f rs and η =( )( ) Nu Nu f f / // p rs ss rs ss 0.33 of solar air channel attached with broken multiple V-type baffle on the base of the heated wall. The heat transfer enhancement is a strong function of W W/ D B and broken multiple V-type baffles outcomes in significant improvement in Nurs of air flow in a solar air channel. With an increase inRe, Nurs rises while f rs reduces. In comparison of a solar air channel without baffles, a broken multiple V-type baffles have high data of Nurs and f rs. This causes the change in the fluid flow characteristics due to baffles roughness which outcome in stream separation, reattachment and generation of secondary stream jets. For broken multiple V-type baffle baffles with W W/ D B of 5.0, the extreme data of Nurs is observed and extreme data of f rs occurs for broken multiple V-type baffle baffles with W W/ D B of 6.0. In broken multiple V-type baffles solar air channel, the optimal data of thermo-hydraulic performance has been found corresponding to W W/ D B of 5.0. The broken multiple V-type baffles has also been found to be thermo hydraulically superior as compared to other baffles shapes solar air channel.