Effect of Vortex Generators and Integral Splitter Plate on Heat Transfer and Pressure Drop for Laminar Flow Past Channel-Confined Tube Banks
TL;DR: In this paper, a finite-volume based computational code has been developed for the computations of heat transfer and pressure drop characteristics for laminar flow past circular tube banks in staggered and in-line arrangement confined within a narrow rectangular channel.
Abstract: Three-dimensional numerical computations are carried out to study heat transfer and pressure drop characteristics for laminar flow past circular tube banks in staggered and in-line arrangement confined within a narrow rectangular channel. A finite-volume based computational code has been developed for the computations. Vortex generators mounted near the upstream tube promote fluid mixing and enhance heat transfer in stagnant wake zone behind the tubes but offer extra pressure drop penalty. A splitter plate attached to the rear of the upstream circular tube acts as an extended heated surface and is expected to reduce the extra pressure drop due to vortex generators. The objective of this study is to find the configuration of tube arrangement in the presence of vortex generators and splitter plate that would be associated with enhanced heat transfer and reduced pressure drop. Heat transfer and pressure drop characteristics are presented for different lengths of the splitter plate in the absence and presence...
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TL;DR: In this article, the experimental and the three-dimensional numerical simulation of cross flow tube bank in staggered arrangements with and without the splitter plate attachment is performed with (5500⩽-Re/Re/14,500) and splitter length to tube diameter (L/D) ratio as 1.75 and 2.0 respectively.
46 citations
TL;DR: In this paper, the effect of different combinations of circular and elliptical tubes on air-side flow and heat transfer characteristics are studied with various inlet air velocities in the range, 0.5-2.5m/s.
39 citations
01 Oct 2016
TL;DR: In this article, the effect of the location of waviness on vortex formation and its shedding frequency has been closely captured and presented and the flow parameters such as drag, lift and Strouhal number are calculated using the field data obtained from computations.
Abstract: Flow past circular cylinder confined by walls with local waviness near the cylinder has been computed and the vortex shedding characteristics are studied at Reynolds number 200. The governing equations are solved using finite volume based CFD solver, 'Ansys Fluent 15.0'. In the present study, flow fields have been computed with waviness placed at four different locations. The effect of the location of waviness on vortex formation and its shedding frequency has been closely captured and presented. The flow parameters such as drag, lift and Strouhal number are calculated using the field data obtained from computations. It has been observed that the vortex shedding is significantly controlled by changing the location of local waviness. Among the four different locations considered in the present study, the waviness located near the wake region effectively suppresses the shedding. Moreover, the inward projection of the waviness plays a vital role in vortex suppression. It is also observed this method of vortex suppression leads to increase in drag.
8 citations
TL;DR: In this article, rectangular winglets were fixed on the base board with common inflow orientation to direct the flow toward the core of stagnation zone to enhance heat transfer from near-wake heat source surfaces besides the generated large-scale turbulence vortices.
8 citations
TL;DR: In this paper, numerical optimization of heat and fluid flow over staggered tube banks is investigated for both unfinned and axially finned tube banks using Ansys Fluent software for numerical computation.
Abstract: Numerical optimization of heat and fluid flow over staggered tube banks are investigated for both unfinned and axially finned tube banks Ansys Fluent software is utilized for numerical computation
3 citations
Additional excerpts
...Jayavel and Tiwari [12] carried out numerically heat transfer and fluid flow over circular tube banks for both in-line and staggered arrangements in a confined rectangular domain....
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...Jayavel and Tiwari [15], and Aiba et al. [16] stated that heat exchanger design must have two goals; namely, maximizing heat transfer and minimizing pressure drop....
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...Jayavel and Tiwari [12] carried out numerically...
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References
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Book•
01 Jan 1980
TL;DR: In this article, the authors focus on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms.
Abstract: This book focuses on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms. Using simple algebra and elementary calculus, the author develops numerical methods for predicting these processes mainly based on physical considerations. Through this approach, readers will develop a deeper understanding of the underlying physical aspects of heat transfer and fluid flow as well as improve their ability to analyze and interpret computed results.
21,858 citations
"Effect of Vortex Generators and Int..." refers methods in this paper
...The semi-implicit method for pressure-linked equations (SIMPLE) algorithm of Patankar [ 15 ] has been used to solve the discretized flow equations....
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TL;DR: In this paper, a convective modeling procedure is presented which avoids the stability problems of central differencing while remaining free of the inaccuracies of numerical diffusion associated with upstream differencings.
4,190 citations
"Effect of Vortex Generators and Int..." refers methods in this paper
...In the present study, the QUICK (quadratic upstream interpolation for convective kinematics) scheme of Leonard [16] has been employed to compute the convective fluxes....
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01 Jan 1979
2,299 citations
TL;DR: In this article, a Sommerfeld radiation condition (2.2) was proposed for problems requiring a prescribed open boundary, and two severe tests were used to demonstrate the applicability of the open boundary condition: collapsing bubble, a dynamic event which excites many different internal gravity waves.
1,870 citations
TL;DR: In this article, a modification to Kirchhoff's free streamline introduces the parameter k = √(1-C_ps), which allows arbitrary base pressure and which must depend on the dynamics of the wake.
Abstract: A modification to Kirchhoff's free streamline introduces the parameter k = √(1- C_ps), which allows arbitrary base pressure and which must depend on the dynamics of the wake. For a cylinder of given cross-sectional shape, the drag, C_D, and the wake width, d', are functions of k only. These functions are used to relate C_D and the dimensionless shedding frequency , S = nd/U_ ∞ to another number, S* = nd' / U_s, which is based on wake parameters. It is found that S* = 0.16 for all cylinders. In another approach, k is evaluated by using Karman's solution for the vortex street.
646 citations