scholarly journals Experimental and numerical analysis of the influence of the nozzle-to-plate distance in a jet impingement process

2020 ◽  
Vol 23 (2) ◽  
pp. 81-91
Author(s):  
Flavia BARBOSA ◽  
Senhorinha TEİXEİRA ◽  
José TEİXEİRA
Keyword(s):  
Numerical Analysis ◽  
Jet Impingement ◽  
Impingement Process ◽  
Plate Distance

Comparison of Various RANS Models for Impinging Round Jet Cooling From a Cylinder

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Ketan Atulkumar Ganatra ◽  
Dushyant Singh
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Turbulence Model ◽  
Three Dimensional ◽  
Turbulence Models ◽  
Jet Impingement ◽  
Target Surface ◽  
Point Of View ◽  
Nozzle Diameter ◽  
Round Jet

The numerical analysis for the round jet impingement over a circular cylinder has been carried out. The v2f turbulence model is used for the numerical analysis and compared with the two equation turbulence models from the fluid flow and the heat transfer point of view. Further, the numerical results for the heat transfer with original and modified v2f turbulence model are compared with the experimental results. The nozzle is placed orthogonally to the target surface (heated cylindrical surface). The flow is assumed as the steady, incompressible, three-dimensional and turbulent. The spacing between the nozzle exit and the target surface ranges from 4 to 15 times the nozzle diameter. The Reynolds number based on the nozzle diameter ranges from 23,000 to 38,800. From the heat transfer results, the modified v2f turbulence model is better as compared to the other turbulence models. The modified v2f turbulence model has the least error for the numerical Nusselt number at the stagnation point and wall jet region.

Numerical Analysis of the Effect of Non Uniform Electric Field on the Trajectory of Micro Water Jet

2015 ◽  
Author(s):  
Satyabrata Mohanty ◽  
Kornel F. Ehmann ◽  
Jian Cao
Keyword(s):  
Numerical Analysis ◽  
Electric Field ◽  
Jet Impingement ◽  
Water Jet ◽  
Uniform Electric Field ◽  
Static Electric Field ◽  
Liquid Dielectrophoresis ◽  
Fine Control ◽  
Unique Approach ◽  
And Control

In spite of its inherent advantages as a manufacturing tool, water-jet has not been extensively applied to the field of micro-manufacturing due to its low tolerance and poor control of the position of jet impingement. This paper explores the possibility of using the phenomenon of liquid dielectrophoresis to deflect and control the trajectory of a water jet in air. An approach is suggested using a localized non-uniform static electric field over a micro water jet with diameters in the range of 25–100 micrometers. The water jet has been modelled as a thin dielectric column and the numerical analysis of the electric field distribution has been carried out using COMSOL to analyze the generated forces and predict the scale of deflection of the jet. This unique approach of harnessing the polar nature of water using the phenomenon of dielectrophoresis might be useful in achieving fine control of the water jet’s trajectory especially in micro water jet material processing.

scholarly journals Effects of the stroke length and nozzle-to-plate distance on synthetic jet impingement heat transfer

2018 ◽  
Vol 117 ◽  
pp. 1019-1031 ◽  
Author(s):  
Carlo Salvatore Greco ◽  
Gerardo Paolillo ◽  
Andrea Ianiro ◽  
Gennaro Cardone ◽  
Luigi de Luca
Keyword(s):  
Heat Transfer ◽  
Jet Impingement ◽  
Synthetic Jet ◽  
Stroke Length ◽  
Impingement Heat Transfer ◽  
Plate Distance

NUMERICAL ANALYSIS OF HEAT TRANSFER FOR JET IMPINGEMENT ON A HOT STEEL PLATE DURING SECONDARY COOLING

2018 ◽  
Author(s):  
Haibo Ma ◽  
Justina Lee ◽  
Rui Liu ◽  
Michael Lowry ◽  
Armin Silaen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Steel Plate ◽  
Jet Impingement ◽  
Secondary Cooling

An Experimental Investigation on Heat Transfer Characteristics of Hot Surface by Using CuO–Water Nanofluids in Circular Jet Impingement Cooling

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Mayank Modak ◽  
Sandesh S. Chougule ◽  
Santosh K. Sahu
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Reynolds Number ◽  
Nusselt Number ◽  
Jet Impingement ◽  
Test Surface ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Hot Surface ◽  
Plate Distance

In the present study, an experimental investigation has been carried out to analyze the heat transfer characteristics of CuO–water nanofluids jet on a hot surface. A rectangular stainless steel foil (AISI-304, 0.15 mm thick) used as the test surface is electrically heated to obtain the required initial temperature (500 °C). The distribution of surface heat flux on the target surface is evaluated from the recorded thermal images during transient cooling. The effect of nanoparticle concentration and Reynolds number of the nanofluids on the heat transfer characteristics is studied. Tests are performed for varied range of Reynolds number (5000 ≤ Re ≤ 12,000), two different CuO–water nanofluids concentration (Ф = 0.15%, 0.6%) and two different nozzle to plate distance (l/d = 6, 12). The enhancement in Nusselt number for CuO–water nanofluids was found to be 14% and 90%, for nanofluids concentration of Ф = 0.15% and Ф = 0.60%, respectively, compared to pure water. The test surface characteristics after nanofluids jet impingement are studied using scanning electron microscope (SEM). Based on the investigation, a correlation among various parameters, namely, Reynolds number (Re), Prandtl number (Pr), nozzle to plate distance (l/d), and Nusselt number (Nu), is presented.

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