International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 03 | Mar 2024
p-ISSN: 2395-0072
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Thermohydraulic performance of Curved Delta Winglet Vortex Generator using Ramped Expansion Channel Devaprasath A1, Gowtham S1, Hariharan V1, Sivakumar S2 1Student, Department of Mechanical Engineering, Kumaraguru College of Technology, Tamil Nadu, India. 2Assistant Professor II, Department of Mechanical Engineering, Kumaraguru College of Technology, Tamil Nadu,
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instabilities and, to some extent, reduce the unpredictability, researchers have been experimenting with a variety of shapes, including rib, fence, bluff body with a splitter plate, abruptly expanding pipes, ramping duct, and cavities. Because of its one set separation point, the ramped expansion channel proved to be the most popular of all. There are three main areas that make up the flow wake: the shear layer area, the separation bubble or recirculation zone, and the reattachment zone. These divisions are based on the important flow characteristics in a planar ramping geometry that have been studied by previous researchers. Due to the unfavorable pressure gradient that forms into a thin boundary layer, the basic features of a ramped expansion flow start with an angular momentum in the flow. The turbulent structures inside the boundary layer merge as the flow moves downstream, expanding the boundary layer's area. The term "layer region" refers to this area where the boundary layer forms and expands. In the space between the shear layer and the nearby wall, this flow results in lowvelocity recirculation. The recirculation zone of the ramping geometry produces a primary vortex in the center and a secondary vortex adjacent to the corner. When the shear layer eventually swings down towards the wall, the reattachment point is where the fluid's advantageous pressure gradient hits the wall at a specific location.
Abstract – The search for improving heat transfer and fluid mixing efficiency in diverse engineering applications has prompted the investigation of novel vortex generator geometries and combinations. This study examines the thermohydraulic performance of a new ramping expansion channel incorporated curved delta winglet vortex generator. The goal of the curved delta winglet vortex generator is to minimize pressure loss while increasing convective heat transfer and creating vortices. The use of a ramped expansion channel is intended to regulate the flow field and enhance the capacity for heat transmission. The study methodically investigates the effects of ramp angle, winglet height, and geometrical factors on the system's thermohydraulic performance. Key Words: Heat transfer, vortex generator, ramped expansion channel, ramp angle.
1.INTRODUCTION The utilization of vortex generators in real-time has been made possible by recent successful inventions, research, and testing aimed at improving the effect of heat transmission. By creating vortices in the boundary layer, delta winglet vortex generators have traditionally shown themselves to be effective in enhancing convective heat transfer. But more recently, developments have accelerated the shift to curved versions, leveraging the advantages of curved geometries to maximize vorticity production and flow management. Meanwhile, the addition of a ramped expansion channel gives the flow route a new dimension and improves mixing and heat transmission properties. Comprehending the complexities of heat transmission and fluid movement in this unique arrangement is crucial for improving thermal engineering techniques. The knowledge gained from this study may be applied to the design and improvement of air-cooling systems, heat exchangers, and other thermal management equipment, leading to the creation of more sustainable and energy-efficient engineering solutions.
1.2 Vortex Generator To provide a safety buffer between the airspeed and stall speed, vortex generators are tools that help lower the stall speed. By increasing the flow's turbulent nature and decreasing the creation of boundary layers, vortex generators aid in improving heat transfer performance. In a channel, the strong turbulent flow of the medium decreases the development of boundary layers and increases heat transmission. Based on their features and usage patterns, vortex generators may be categorized. Both passive and active vortex generators are those. Using a certain aerodynamic surface shape, passive vortex generators may produce rolling or longitudinal vertices without the need for outside power sources. Delta winglet (DW) and Delta winglet pair (DWP) are the most utilized configurations. A winglet is created when the vortex generators have distinct angles of attack from one another, whereas a wing is defined as geometry positioned perpendicular to the direction of flow.
1.1 Ramped expansion channel Separated flows are difficult to understand because of their unpredictable nature. To better understand these
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