Journal ArticleDOI
Three-Dimensional Study of Multiple-Jet Cross Flow Cooling System with Single Array of Heat Sources
TLDR
In this article, the role of three dimensional flow structures, horseshoe vortex and counter rotating vortex pair in overall heat transfer distribution is examined, and a parametric study is performed to analyze the performance of jets in cross flow for various Reynolds numbers (Re = 100, 250, 500) and velocity ratios (VR = 1.0, 5.0 and 10.0).Abstract:
ABSTRACT The objective of this study is to predict fluid flow and thermal characteristics associated with forced convection cooling of an array of heat sources mounted in a three-dimensional duct by impinging jets in the presence of cross flow. The equations governing fluid flow and heat transfer are solved using Streamline Upwind / Petrov - Galerkin based finite element method. The role of three dimensional flow structures, horseshoe vortex and counter rotating vortex pair in overall heat transfer distribution is examined. A parametric study is performed to analyze the performance of jets in cross flow for various Reynolds numbers (Re = 100, 250, 500) and velocity ratios (VR = 1.0, 5.0, 10.0). It is observed that with the increase in velocity ratio, the enhancement of heat transfer from heat sources occurs due to increase in the dominance of jet flow accompanied by an unfavorable reduction in heat transfer owing to the increase in size of horseshoe vortex. From numerical studies, it can be concluded that VR = 5.0 exhibits higher overall surface averaged Nusselt number (51.7% over VR = 1.0 and 44.1% over VR = 10.0 for Re = 500) compared to other velocity ratios considered in this study.read more
Citations
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Journal ArticleDOI
Experimental study of fluid flow and heat transfer of jet impingement in cross-flow with a vortex generator pair
TL;DR: In this article, the authors investigated the fluid flow and heat transfer behaviors of jet impingement in cross-flow modified by a vortex generator pair (VGP), and they demonstrated that the heat transfer on the target wall is dominated by the wall-normal velocity of the impingements and the turbulent kinetic energy, rather than the streamwise velocity along the crossflow direction.
Journal ArticleDOI
Steady and Unsteady Forced Convective Heat Transfer Analysis in 180 Degree Bend
TL;DR: In this article, numerical studies on fluid flow and heat transfer through a two-dimensional 180-degree sharp bend are performed using an in-house code based on streamline upwind Petrov-Galerkin finite element meth.
Journal ArticleDOI
Effect of Cylinder Arrangement on Fluid Flow and Heat Transfer Characteristics past Four Elliptic Cylinders
TL;DR: In this article, an in-house finite element method code based on a square configuration of four elliptic cylinders arranged in square configuration was proposed to investigate the flow and heat transfer characteristics of the four cylinders.
Journal ArticleDOI
Numerical Study on Flow Structures of a Hollow Cone Spray in Crossflow
TL;DR: In this article, numerical investigation on the flow field structure of a hollow cone spray injected transversely into a confined crossflow is presented, and the unsteady turbulent flow is predicted by a...
Journal ArticleDOI
Experimental Study on Heat Transfer Enhancement of Air Jet Impingement for Electronics Thermal Management
TL;DR: In this article , a flat heating surface placed in a flow channel, including single jet cooling, in-line double jet cooling and combined crossflow and jet cooling was investigated, and it was found that heat transfer depends on the jet distance because one jet may produce a crossflow effect on the other jet, affecting the formation of longitudinal vortices.
References
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Journal ArticleDOI
Effect of jet-to-plate spacing in laminar array jets impinging
TL;DR: In this paper, the effect of jet-to-plate spacing and jet to cross-flow velocity ratio on heat transfer is presented and discussed, and the predicted results show a formation of one or two ground horseshoe vortices between the jets.
Journal ArticleDOI
Direct Numerical Simulation of Single and Multiple Square Jets in Cross-Flow
Yufeng Yao,Mohamad Maidi +1 more
TL;DR: In this article, the authors performed direct numerical simulations for single and multiple square jets issuing normally into a cross-flow, with the primary aim of studying the flow structures and interaction mechanisms associated with the jet in crossflow (JICF) problems.
Journal ArticleDOI
Local heat transfer distribution of an impinging air jet through a crossflow
TL;DR: In this paper, an experimental investigation was conducted to study the effect of crossflow on the local heat transfer distribution of a flat surface normally impinged by a round air jet, where the influence of jet-to-plate distances (z/d of 4, 6 and 12), the crossflow velocity to the jet velocity (M varying from 1/6 to 1/12), and the Reynolds number (Re varying from 6000 to 12,000) on the heat transfer was studied.
Journal ArticleDOI
Three-dimensional numerical study of jet-in-crossflow characteristics at low Reynolds number
TL;DR: In this article, a numerical study of a square jet in a cross flow is carried out at a Reynolds number of 100, and the flow field and heat transfer characteristic downstream of the jet have been explored by solving three-dimensional unsteady Navier-Stokes equations and energy equation using higher order spatial and temporal discretization.
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