CFD Simulation of Flow Mixing in Tunnel Kilns by Air Side Injection

[+] Author and Article Information
Adnan Ghareeb Tuaamah Al-Hasnawi

Electromechanical Engineering, University of Technology, Tal Muhammad 10066, Baghdad, Iraq

Hassanein Refaey

Department of Mechanical Engineering, Faculty of Engineering at Shoubra, Benha University, 11629 Cairo, Egypt

Tino Redemann

Institute of Fluid Dynamics and Thermodynamics, Otto von Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany

Dr. M. Attalla

Mechanical Power Department, Faculty of Engineering, South Valley University, Qena, Egypt

Eckehard Specht

Institute of Fluid Dynamics and Thermodynamics, Otto von Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany

1Corresponding author.

ASME doi:10.1115/1.4038840 History: Received November 13, 2016; Revised November 28, 2017


The mixing of the two axial flows through the ware and through the gap between ware and walls using side nozzles in the preheating zone of tunnel kiln is investigated. The 3D temperature field in the cross section between the two cars is calculated using the CFD tool Fluent. The mixing quality is evaluated using contours, the frequency of temperature distribution and the maximum temperature difference. The influence on the mixing behaviour of injection flow rate, injection velocity, nozzels position and nozzle number has been analyzed. The results show that using two nozzles is more effective than one nozzle if the nozzles are installed at the opposite side walls with high vertical distance. The mixing quality increases strongly until an impulse flow rate of about 4 N. For higher values the influence becomes relatively low. The results for the mixing temperature obtained through CFD simulation compared with analytical results show a good agreement with maximum error of 0.5%.

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