Author/Authors :
Mahdi, Areej Sami Training and Workshops Center - University of Technology, Iraq , Al- Musawi, Sanaa Turki Mousa Department of Reconstruction and Projects - University of Baghdad, Iraq , Kadhim, Zena Khalefa Mechanical engineering department - Wasit University, Iraq , Hussain, Hasanen Mohammed Mechanical Engineering Department - University of Technology, Iraq , Habeeb, Laith Jaafer Training and Workshops Center - University of Technology, Iraq
Abstract :
This study investigate the heat transfer improvement in a single tube heat exchanger with and without twisted tape insert with twist ratio (y/w = 4 and 6). The performance of the heat exchanger studied on the oblique and horizontal tube. The laboratory work included fabricating a circular tube heat exchanger which made from copper material of length (1000 mm) and inner and outer diameter of (23 and 25) mm, respectively. Distilled water under laminar flow condition (Re =1056 – 2002) flows through insulated tube by using fiber glass at the outer surface to reduce the thermal losses. The inserted tape was made from copper strip of thickness (0.8 mm) and full length inserted in the test section. The results showed that the employ of inserted tape yield a considerable increase in the coefficient of heat transfer about (16-27)% more than smooth tube. Empirical correlations for Nusselt number and friction factor were developed during this work. The flow field and heat transfer are analyzed and simulated using ANSYS 15.0, FLUENT package. A comparison of thermal performance for plain and twisted tape insert tubes was implemented and gave good agreements between the experimental and numerical results with a maximum deviation of 10%.
Keywords :
Laminar flow , V-cut twisted tape , heat exchange , twisted ratio
