Numerical analysis was carried out to study the flow and heat transfer characteristics around staggered tubes with rectangular vortex generators (VGs) mounted behind the tubes. The effect of location VGs in different span angle from stagnation point (Φ=120°, 135° and 140°) were investigated in detail while the Reynolds number based on diameter tube was kept constant at ReD=2959. The numerical results are also analyzed from the correlation between the contour velocity and temperature gradients which is a basic mechanism of heat transfer. The results indicated that the rectangular VGs is able to improve the convection heat transfer on the rear part of upstream tube and forepart of downstream tube. The average Nu was shown to increase by 8%-78% and it is found that the location VGs on Φ=120° provides the best heat transfer augmentation.
|Number of pages||5|
|Journal||ARPN Journal of Engineering and Applied Sciences|
|Publication status||Published - 2016|
- Heat transfer enhancement
- Staggered tubes
- Vortex generators