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pressure-drag-coefficients
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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
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
Numerical simulation of drag reduction in microgrooved substrates using lattice-boltzmann method
, Article Journal of Fluids Engineering, Transactions of the ASME ; Volume 141, Issue 7 , 2019 ; 00982202 (ISSN) ; Moosavi, A ; Etemadi, A ; Sharif University of Technology
American Society of Mechanical Engineers (ASME)
2019
Abstract
We study drag reduction of a uniform flow over a flat surface due to a series of rectangular microgrooves created on the surface. The results reveal that making grooves on the surface usually leads to the generation of secondary vortices inside the grooves that, in turn, decreases the friction drag force and increases the pressure drag force. By increasing the thickness of the grooves to the thickness of the obstacle, the pressure drag increases due to the enhancement of the generated vortices and the occurrence of separation phenomenon and the friction drag reduces due to a decrease of the velocity gradient on the surface. In addition, by increasing the grooves depth ratio, the pressure...