Date of Award


Publication Type

Master Thesis

Degree Name



Mechanical, Automotive, and Materials Engineering


Applied sciences


Amir Fartaj




Maximizing the heat transfer and reducing both the flow resistance and the overall size are vital in heat exchangers design. In view of that, in the present study circular and elliptical tubes were studied as the basic components of heat exchangers. The tubes were arranged to form single in line circular and elliptical tube arrays. The circular tube array consists of 10 tubes with diameter of 22.25 mm, while the elliptical tube array consists of 18 tubes with axis ratio of 0.3. In both arrays, 6.2 mm gab between each two adjacent tubes was kept. The experiments were conducted in a closed loop thermal wind tunnel facility with a 305 mm x 305 mm x 600 mm test section. The study was for heating of air via water in cross flow. For the two arrays, Rea was ranged from 17000 to 49000, and mw was varied from 0.01 to 0.11 kg/s.

The study revealed that mainly the Reynolds number controls the heat transfer mechanism at the air side. Correlations in term of Nua and Sta variations with Rea were established. Also, the pressure drop across the arrays was observed and the results were correlated in term of P