THE EFFECT OF FIN ANGLE ON INCREASING THE HEAT TRANSFER FROM ELECTRONIC COMPONENTS BY APPLYING AN IMPINGING JET-CROSS FLOW

Abstract

With the advancement of technology, circuit elements in developing electronic devices heat up and their temperatures rise depending on the working load. Cross flow, which is one of the methods used to increase heat transfer from electronic circuits, may be insufficient for cooling circuit elements that have reached very high temperatures. The temperature is kept within safe limits by providing an efficient heat transfer from the circuit elements with the impinging jet-cross flow application. In this study, heat transfer from rectangular shaped surfaces with copper plate with constant heat flux of 1000 W/m2 in the channel was investigated numerically by 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 computer program with k-ε turbulence model. In order to direct the flow in the channel to the heated surfaces, the fins with 30o, 45o and 60o angles and the length of the D jet inlet diameter were placed in the channel horizontally with the impinging jet surface. The jet fluid used in the channel is water, and the upper and lower surfaces of the channel and the fin are adiabatic. The distance between the jet and the plate is 45 mm (3Dh), and the jet Reynolds number range is 5000-9000. 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 results were presented as the mean Nu number and surface temperature variation for each rectangular patterned surface. Besides, the velocity-streamline and temperature contour distributions of the impinging jet-cross flow along the channel for channels were evaluated comparatively. For Re = 9000, it was determined that the average Nu number value in the channel with 60o fin angle was 20.02% higher than the channel without fin.