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Pressure loss and heat transfer characterization of a cam-shaped cylinder at different orientations
, Article Journal of Heat Transfer ; Volume 130, Issue 12 , September , 2008 , Pages 1-4 ; 00221481 (ISSN) ; Lavasani, A. M ; Sharif University of Technology
2008
Abstract
Pressure drag coefficient and heat transfer are experimentally investigated around a single noncircular cylinder in cross-flow under angle of attack 0 deg<α>360 deg and Reynolds number 1.5*104
Pressure loss and heat transfer characterization of a camshaped cylinder at different orientations
, Article Journal of Heat Transfer ; Volume 130, Issue 12 , September , 2008 , Pages 1245031-1245034 ; 00221481 (ISSN) ; Lavasani, A. M ; Sharif University of Technology
2008
Abstract
Pressure drag coefficient and heat transfer are experimentally investigated around a single noncircular cylinder in cross-flow under angle of attack O deg < α < 360 deg and Reynolds number 1.5 × 104 < Reeq < 4.8 × 104 based on equivalent diameter of a circular cylinder. The results show that the trend of pressure drag coefficient against the angle of attack has a wavy shape but the wavy trend of the Nusselt number is smoother relative to the drag coefficient behavior. It is found that for l/Deq = 0.4 and over the whole range of the Reynolds number, the pressure drag coefficient has a minimum value of about CD = 0.4 at α = 30 deg, 180 deg, and 330 deg and a maximum value of about CD = 0.9 at...
Experimental study of forced convection heat transfer from a cam shaped tube in cross flows
, Article International Journal of Heat and Mass Transfer ; Volume 50, Issue 13-14 , 2007 , Pages 2605-2611 ; 00179310 (ISSN) ; Lavasani, A. M ; Sharif University of Technology
2007
Abstract
An experimental investigation has been conducted to clarify forced convection heat transfer characteristic and flow behavior of an isothermal cam shaped tube in cross flow. The range of angle of attack and Reynolds number based on an equivalent circular tube are within 0° < α < 180° and 1.5 × 104 < Reeq < 2.7 × 104, respectively. The results show that the mean heat transfer coefficient is a maximum at about α = 90° over the whole range of the Reynolds numbers. It is found that thermal hydraulic performance of the cam shaped tube is larger than that of a circular tube with the same surface area except for α = 90° and 120°. Furthermore, the effect of the diameter of the cam shaped tube upon...
Flow visualization around a non-circular tube
, Article International Journal of Engineering, Transactions B: Applications ; Volume 19, Issue 1 , 2006 , Pages 73-82 ; 1728-144X (ISSN) ; Lavasani, A. M ; Sharif University of Technology
Materials and Energy Research Center
2006
Abstract
The flow behavior around a cam shaped tube in a cross flow has been investigated experimentally using flow visualization and pressure distribution measurements. The range of attack angle and Reynolds number based on an equivalent circular diameter are within 0 < α < 360° and 2×104Reeq <3.4×104, respectively. The pressure drag features are clarified in relation to the flow behavior around the tube. It is found that the highest pressure drag coefficient occurs at α = 90° and 270° over the whole range of Reynolds number. Results show that the pressure drag coefficient of the cam - shaped tube is lower than that of a circular tube with the same surface area for more of the attack angles