INVESTIGATION OF THE VARIATION OF COOLING PERFORMANCE WITHTHE CHANNEL HEIGHT IN A CHANNEL HAVING IMPINGING JET-CROSSFLOW


Creative Commons License

Karabulut K., Alnak D. E.

12th INTERNATIONAL CONFERENCE ON ENGINEERING & NATURAL SCIENCES, Bingöl, Turkey, 24 - 25 December 2021, pp.274-291

  • Publication Type: Conference Paper / Full Text
  • City: Bingöl
  • Country: Turkey
  • Page Numbers: pp.274-291
  • Sivas Cumhuriyet University Affiliated: Yes

Abstract

The cooling process by applying cross flow alone, which is one of the frequently used methods, may be insufficient for electronic circuit elements that reach high temperatures. Cooling with impinging jet, which is another cooling application, provides efficiency in cooling the regions locally. The combined use of impinging jet and cross flow improves cooling performance. In this study, the cooling of copper plate trapezoid surfaces with constant heat flux in the channel having two open sides was numerically investigated using a combination of impinging jet and cross flow. Numerical research was carried out by solving the energy and Navier-Stokes equations as three dimensional and steady, using the Ansys- Fluent program with k-ε turbulence model. With the aim of increase the cooling effect by directing the flow in the channel to the heated surfaces, a fin of 60o angle and D-jet inlet diameter length was placed in the channel horizontally with the impinging jet surface. The distances between the jet flow and trapezoid plate surfaces in the channel were taken as 45 mm, 60 mm and 90 mm. The jet fluid used in the channel is water and the jet Reynolds number range is 11000-15000. The upper and lower surfaces of the channel and the fin are adiabatic, and a constant heat flux of 1000 W/m2 was applied to the trapezoid patterned surfaces. The results of the study were compared with the experimental results of the study in the literature and they were found to be consistent with each other. The reached results were exhibited as the mean Nu number and surface temperature variation for each trapezoid surface. The contour distributions of velocity and temperature of the impinging jet-cross flow along channels were also evaluated. For Re = 15000, it was found that the mean Nu number value in the channel with 45 mm jet-plate distance and the fin was 57.80% higher than that of the 90 mm.