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Oni and Paul  

Full Length Research Paper                                                                     

Assessment of mixed convection heat transfer in a flow through an induced tube

 

Taiwo O. Oni *1 and Manosh C. Paul2

 

1Mechanical Engineering Department, Faculty of Engineering, Ekiti State University, P.M.B. 5363, Ado-Ekiti, Nigeria.

2Systems, Power and Energy Research Division, School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK.

 

Corresponding author email: tooni1610@yahoo.com; Tel: +234(0)803 621 7934

Received July 13, 2015; Accepted July 31, 2015.


ABSTRACT                                                                                                                                   

This research article focuses an assessment of mixed convection heat transfer in a flow through an induced tube. The assessment was numerically carried out to examine the influence of flow orientation on heat transfer and flow characteristics of mixed convection for laminar, transition and turbulent flows through a tube induced with an alternate-axis triangular cut twisted tape. Water with Prandtl number of 5.83 was the working fluid, flow orientation of 150≤θ≤900 was considered, and the wall of the tube was subjected to uniform heat flux. Fluent software was used and the RNG κ-ε was employed for the numerical simulation of the turbulent flow while the transitional variant of the Shear-Stress Transport (SST)κ-ω was applied for the transition flow. The heat transfer was presented in terms of the dimensionless quantity known as Nusselt number and it was discovered that the Nusselt number and the friction factor for the mixed convection flow (150≤θ≤900)were higher than those of the forced convection flow (00). Also, the maximum Nusselt number and the friction factor are obtained at a flow orientation of 900


Keywords:
Assessment, Mixed convection, Flow orientation, Heat transfer, Nusselt number.

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