| dc.description.abstract | While advancement of technology makes the lives of consumers easier, it causes manufacturers to encounter some problems in order to develop longer-lasting and energy-efficient devices. The biggest problem in this matter is overheating in electronic devices, which have a very high capacity compared to previous technologies. This motivates engineers working on heat transfer to turn to new advancement techniques in the field of electronic cooling and its applications. The method of increasing the heat transfer from the heated elements by the impact jet - cross flow combined jet effect, which has been applied recently, is used as an effective cooling technique. In this work, heat transfer from copper plate cube and trapezoidal surfaces in channels where impinging jet - cross flow combined jet flow was applied and the flow structures in the channels were numerically investigated by comparing them with each other. Numerical analysis was performed by solving the energy and Navier-Stokes equations as steady and three dimensional employing the k-ε turbulence model and Ansys-Fluent computer program. While the channel heights (H) for both channels are 3D and 6D, the fluid Re number range is 7000 - 11000. So as to direct the combined jet flow to the patterned surfaces in the channels, fins with a length equal to the D jet inlet diameter and an angle of 45o and 90o (θ) with the horizontal on the upper surface of the channels were placed. Water is used as a fluid in the channel, and the upper and lower surfaces of the channel and the fin are adiabatic. A constant heat flux of 1000 W/m2 was implemented to the designed surfaces. The results obtained from the study were matched with the experimental results of the study in the literature and it was found that they were compatible with one another. The results were analyzed as mean Nu number and surface temperature variations for each cube and trapezoidal surface according to their order in the channel. In Re = 11000 and H = 3D, contour distributions of velocity and temperature of impinging jet - cross flow combined jet flow along channels with cube and trapezoidal surfaces at without fin, 45o and 90o fin angles were presented. For Re = 9000 in H = 3D, it was found that the Num values of the cube and trapezoidal surfaces were 33.15% and 24.57% higher in the 90o fin angled channel than in the case of the without fin, respectively. | tr |
