Impinging Jet System

Project Title

Impinging Jet System

Project Area of Specialization Mechanical EngineeringProject Summary

Impinging jet emerged as an attractive source of heat transfer because of its exceptional ability to enhance 
heat transfer rates. Impinging jet heat transfer method has been used in wide range of industrial processes 
include cooling of electronic equipment, cooling of turbine blades, heating or cooling of metal plates, de-
icing of aircraft wings, drying of food products, textiles, films and papers, cooling of outer wall of 
combustion chamber etc. Jet impingement configuration looks quite simple geometrically but it involves 
some flow complexities such as stagnation point, wall jet region, velocity and temperature profile, local 
and average heat transfer rates around and at surface. The impinging jet flow basically consists of a nozzle 
or nozzle array, a target surface and jet flow between these two surfaces. Heat transfer rates in case of 
impinging jets are affected by various parameters like nozzle geometry, jet orientation, radial distance 
from stagnation point, jet Reynolds number, Prandtl number, nozzle to surface spacing, jet to jet spacing, 
shape of the target surface, roughness of target surface and turbulence intensity at the nozzle exit.

Project Objectives

Our project focuses on the enhancement of heat transfer through the Impinging Jets. The project is divided into 2 categories;  One to observe the heat transfer enhancement by placing the single rib and multiple ribs on the Impinging plate. Second,  to observes how the heat transfer enhances with multiple jet systems and at what nozzle angle gives us the high heat transfer

The main objectives of our research paper are discussed as

1.we focused on the rib spacing and its demonstration that the  ribspacing must be more than 6 times the nozzle width to improve heat transfer at Reynolds number Re=5.0×103 because it is necessary to
have enough space to allow reattachment of flow behind the first rib.

2.The first
experiment was conducted with one rib on the wall to
demonstrate the effects of the rib location and the nozzlewall
distance. The normalized nozzlewall distance was changed
from 5 to 20 and the normalized rib location was changed from
0 to 8. The second experiment presented the optimum rib
locations using several ribs. Both experiments are conducting at Reynolds number Re=5.0×103 based on the nozzle exit width B=5 mm and the jet exit velocity.

3.Three different nozzle configurations are used 
in the study namely a single nozzle and perforated nozzles with four and nine holes, which are accommodated in the 
same available jet area 4.6 mm × 4.6 mm.The pressure drop across the orifice nozzle plate is measured and corresponding pumping power 
values are calculated. A comparison of the heat transfer 
performance and pumping power penalty of the three noz-
zle configurations is done.

4.Measurements of the local heat transfer distribution on smooth and roughened surfaces under an array of angled impinging jets are presented. The test rig is designed to simulate impingement with crossflow in one direction. Jet angle is varied between 30, 60, and 90 deg as measured from the target surface, which is either smooth or randomly roughened.

Project Implementation Method

The project is to be carried out in Ansys software. The software usually performs a million Iterations to converge the the results. The software when converge the results show the all the basic requirements necessary to witness the heat transfer enhancement like Nusselt number , Reynold Numbers , temperature pressure velocity turbulence contours and plots etc . The project requires various advance models of Ansys fluent to run the simulations and for this high designed computers are required to run. Since the geometry's meshing is made very fine about 30 million minimum nodes to run the simulations and on it the a billion iterations is run to find the exact results. Therefore the complexity in this project is highly extended. 

Benefits of the Project

Jet impingement systems provide an effective means for the intensification of convective processes due to the high heat and mass transfer rates that can be achieved. The range of industrial applications, which impinging jets are being used in today, is correspondingly wide. In turbomachinery, jet impingement has been routinely used over a long time for the cooling of various components, most especially turbine vanes and blades or combustion chamber walls. However, demands for increased power output, higher thermal efficiency, and reduced emissions require continuous development of the cooling technology. In particular for combustor liners, design emphasis has changed from formerly used f ilm cooling to convective cooling concepts using arrays of impinging jets.Many parameters affect the increase in heat and mass transfer associated with impinging jets, such as size and shape of jet nozzle, Reynolds number of jet flow, separation distance, jet arrangement, jet incidence angle, and surface roughness. The heat transfer characteristics of jet impinging on a rough surface are significantly different from those on a smooth surface. The impinging jet on rough surfaces is considered most important in cooling of gas turbine blades.

Technical Details of Final Deliverable

Dell Vistro 3669 MT (E1916HV 18.5)

Intel core i5 7th generation, 3.0GHz, 4gb,  1 TB(Terra byte) 

Final Deliverable of the Project Hardware SystemCore Industry Energy Other IndustriesCore Technology OthersOther TechnologiesSustainable Development Goals Clean Water and SanitationRequired Resources

Item Name	Type	No. of Units	Per Unit Cost (in Rs)	Total (in Rs)
			Total in (Rs)	69999
Dell Vistro 3669 MY	Equipment	1	69999	69999