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Prof. Ali Ali Abdul Aziz Ali :: Publications:

Title:
Augmentation of convective heat transfer in the cooling zone of brick tunnel kiln using guide vanes: An experimental study
Authors: H.A. Refaey; Ali A. Abdel-Aziz; R.K. Ali; H.E. Abdelrahman; M.R. Salem
Year: 2017
Keywords: Not Available
Journal: International Journal of Thermal Sciences
Volume: 122
Issue: Not Available
Pages: 172-185
Publisher: Elsevier Masson SAS.
Local/International: International
Paper Link: Not Available
Full paper Not Available
Supplementary materials Not Available
Abstract:

One of the most important priorities in brick industry is to reduce energy consumption. Therefore, the present work aims to enhance the average Nusselt number that provides an indication of the production time of the tunnel kiln. A test rig simulating the cooling section of tunnel kiln, by scale 1:4 has been designed and fabricated. Augmentation technique using guide vanes with attack angles (q ¼ 120, 135, and 150) in flow direction are attached to the side walls to direct the flow toward the confined zone between the heated columns. This technique is applied on ten different settings within Reynolds number range of 11,867  Re  25,821. The results demonstrate that the heat transfer and pressure drop depends on the brick setting. Furthermore, using guide vanes increases the heat transfer rates with all settings. The maximum enhancement of about 94.5% is obtained for longitudinal brick at middle column (compared with that nearest to the wall) in setting 2 at q ¼ 135 and Re ¼ 22,407. Finally, the present study aimed to extend kiln designers with Nusselt number correlations within 11,867  Re  25,821, 0.33 (S/a)  1.0, 0.79  (εS=b)  3.0, and 120  q  180.

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