Analyze and simulate the flow and temperature on the surface of the heat sink. The fin radiator is composed of independent parallel oil flow channels, and each channel is composed of three connected small channels. The overall film length and film width diagram is a simplified model of the fin radiator. Export the simulated data to obtain a cloud map of its temperature distribution. On the horizontal line, the viscosity increases from the middle to the two sides, and some of the viscosity increases in the longitudinal direction, which proves that the speed of the oil in the oil passage decreases from the middle to the two sides. From the figure, the temperature distribution of the oil gradually decreases from the middle oil channel to the two sides. The isotherm is a downward convex curve, and in the longitudinal direction, the temperature gradually decreases.
Infrared wall temperature analysis. Taking the infrared camera on the upper surface of the heat sink, the following figure is obtained. As can be seen from the figure, the wall temperature gradually decreases from top to bottom. On the same horizontal line, there is a trend of high in the middle and low on both sides, but slightly in the middle of * It is lower than the oil passages on both sides. This is due to the internal structure of the actual heat sink. The oil from the upper oil collecting pipe is divided into two strands, and most of it flows into the oil passages on both sides of the middle. The length of each flow channel increases from the middle to the two sides, so the resistance also increases accordingly, so such a temperature cloud picture appears. It can be seen that the simulation and experimental results are basically consistent. It can be seen from the simulation and infrared cloud chart that most of the oil flows through the middle oil passage, and the flow rate is fast. Not only the flow on both sides is small, but the large resistance leads to the slow flow rate of the oil. Although the heat dissipation capacity on both sides is good, the overall heat dissipation is not effectively. The figure and the figure are the improved heat sink shape simulation temperature distribution cloud diagram. The improved fin shape improves the overall oil flow distribution and improves the heat dissipation efficiency. Therefore, appropriately increasing the flow on both sides or shortening the length of the oil flow channels on both sides can increase the heat dissipation effect.
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