On the fluctuating wall pressure field in tube banks

Endres, Luiz Augusto Magalhães; Möller, Sérgio Viçosa

doi:10.1016/s0029-5493(00)00293-4

Cited by 32 publications

(12 citation statements)

References 3 publications

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“…Oztop and Dagtekin (2003) numerically studied the heat transfer enhancement in a contraction‐expansion‐contraction pipe insertion. Other similar works can be found in literature as Endres and Moller (2001), Gupta et al (1995), Kang and Anand (2003), Molki and Mostoufizadeh (1989), Lei et al (2008), Wilfried and Deiying (1994), Turan (2010) and Somchai and Pongjet (2009) studied the same geometry for laminar flow conditions using SIMPLE algorithm. They found that apart from the rise of Reynolds number, the reduction of the baffle angle leads to an increase in the Nusselt number and friction factor.…”

Section: Introductionmentioning

confidence: 76%

Turbulent flow and heat transfer enhancement of forced convection over heated baffles in a channel

Saïm

Benzenine

Öztop

et al. 2013

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose -The purpose of this paper is to examine the turbulent fluid flow and heat transfer characteristics for rectangular channel provided with solid plate baffles which are arranged on the bottom and top channel walls in a periodically staggered way. Design/methodology/approach -The turbulent governing equations are solved by a finite volume method with the second-order up winding scheme and the k-v turbulence model to describe the turbulent structure. The velocity and pressure terms of momentum equations are solved by SIMPLE (semi-implicit method for pressure-linked equation) algorithm. The parameters studied include the entrance Reynolds number Re (5.10 3 -2.10 4 ), the baffles height are fixed at (h ¼ 0.08 m); whereas three different baffle spacing were considered S 1 ¼ D, S 2 ¼ D/2 and S 3 ¼ 3D/2 and the working medium is air. Findings -In this work, it is found that vortex shedding generated by the baffle on the upper wall can additionally enhance heat transfer along the baffle surfaces. The wavy flow significantly changes the recirculating zone behind the last baffle. Finally, changing the baffles spacing seemed to reduce to changing the heat transfer surface between the solid and the fluid in the sense that higher heat transfer is obtained for lower spacing between baffles. Originality/value -The results of the numerical calculations of the flow field indicate that the flow patterns around the solid baffles depending on the spacing of the baffles and it significantly influences the local heat transfer coefficient distributions. The problem is inversely proportional for the friction factor. Turbulent flow and heat transfer¼ production of turbulent kinetic energy due to velocity gradient through (m 2 /s 2 ) G v ¼ kinetic energy production due to buoyancy (m 2 /s 2 )Greek symbols v ¼ the specific dissipation rate of turbulence energy (m 2 /s) r ¼ density of the air (kg/m) l ¼ thermal conductivity (w/m8C) m l , m t ¼ laminar, turbulent viscosity (kg/m s) m f ¼ dynamic viscosity of fluid (kg/m s) m e ¼ Effective viscosity (Pa· s)¼ the shear-stress to the wall (kg/(s 2 · m)) Dp ¼ pressure losses G k , G v ¼ effective diffusivity of k and v, respectively a ¼ coefficient of thermal expansion (k 2 1 ) d ij ¼ stress tensor a * ¼ coefficient damps the turbulent viscosity causing a low-Reynolds-number correction a * 1

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Section: Introductionmentioning

confidence: 76%

Turbulent flow and heat transfer enhancement of forced convection over heated baffles in a channel

Saïm

Benzenine

Öztop

et al. 2013

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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“…The aeraulic boundary condition is considered to be a consistent 1-D velocity (U in ) at the duct's intake as provided in the literature (Demartini et al, 2004;Endres & Möller, 2001;Nasiruddin & Siddiqui, 2007). The air temperature is 300 K at section x = 0 (Nasiruddin & Siddiqui, 2007).…”

Section: Conception Of a Duct Provided By Vortex V-generatorsmentioning

confidence: 99%

Numerical calculations of the thermal-aerodynamic characteristics in a solar duct with multiple V-baffles

Menni

Ghazvini

Ameur

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The study aimed to enhance the heat transport by improving the hydrodynamic structure of the system by changing and restructuring the duct's internal geometry. Modern fins, of the shape 'V', have been proposed with different dimensions, and they are periodically arranged over the duct surfaces. The most important steps of this research are the change in the V-fin attack-angle (40°-80°), length (H b /2, 3H b /4, H b , 5H b /4 and 3H b /2), and separation length (D s /2, 3D s /4, D s and 5D s /4), as well as the flow rate (6 × 10 3-3 × 10 4). The study yielded an optimum case for a 40-degree attack-angle, with a factor of thermal enhancement of 2.163 for the highest value of Reynolds number. On the other hand, improving the length of the V-fins or decreasing in the space between them, increases the flow strength by enlarging the recycling cells, which reflects on the hydrodynamic behavior, and changes the heat transfer. The presence of this new model of fins also highlights a hydrothermal improvement ranging between 1.196 and 23.779 percent compared to the previously indicated models, reflecting the effectiveness of the new system of solar heat exchangers with air V-finned ducts.

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“…A non-uniform grid is used depending on the cases studied, with a refinery in areas containing baffles and close to walls, to capture the strong gradients of temperature and speed. The method of extending the field is applied [15,16] for the treatment of solid-fluid interface. A high value is attributed to the viscosity in the equation of momentum to simulate the solid.…”

Section: Numerical Solution Proceduresmentioning

confidence: 99%

Numerical Study on Turbulent Flow Forced-Convection Heat Transfer for Air in a Channel With Waved Fins

Benzenine

Saïm

Abboudi

et al. 2013

mech

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On the fluctuating wall pressure field in tube banks

Cited by 32 publications

References 3 publications

Turbulent flow and heat transfer enhancement of forced convection over heated baffles in a channel

Turbulent flow and heat transfer enhancement of forced convection over heated baffles in a channel

Numerical calculations of the thermal-aerodynamic characteristics in a solar duct with multiple V-baffles

Numerical Study on Turbulent Flow Forced-Convection Heat Transfer for Air in a Channel With Waved Fins

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