Research on automotive headlamp radiators has achieved some success at home and abroad. In 2002, General Electric Co., Ltd. used heat sinks equipped with arrays behind the LED modules in its small power LED lamps. Aqkahn et al. used a piezoelectric fan for forced convection cooling of the LED in 2004. The final result is that the cooling method is 37°C lower than the natural convection cooling temperature. The loop heat pipe was used to cool the LED street lights. Since the heat pipe has good flexibility, fluid heat transfer can be performed in a long space, and it can be installed at any position according to the designed street light. In the final experiment, the microcapillary material was used as the wick for the loop heat pipe. The final result showed that the ambient temperature was 35°C and the surface temperature of the loop heat pipe was 73°C in the case of natural convection.
In 2005, the micro-channel cooling method was applied to LED arrays, and a flat plate made of silicon material or metal matrix composite material MMC was installed below the LED module. Under the plate, micro-machining method is adopted to process the plate into micro-channels, and the fluid flows in these channels. The fluid draws the heat generated by the LED. The micro-injection cooling scheme for high-power LED arrays was used and the cooling system was optimized numerically. In 2011, the Institute of Physical and Chemical Technology, Chinese Academy of Sciences developed an industrial prototype of high-power LED liquid metal radiators and produced a liquid metal radiator industrial prototype for 200W LEDs to ensure that the maximum temperature at the back of the substrate is low when the LED light source is operating at room temperature at full load. At 45 °C. The structure and principles of the above-designed high-power LED automotive headlamp radiators are relatively complex, and practical applications in automotive headlights are difficult to maintain and many other inconveniences. This article will address the issue of high-power LED car headlights heat dissipation, design three simple and reliable heat sink, thermal analysis through ANSYS, choose a most suitable radiator, the actual processing, experimental verification of the feasibility of its heat .
The equipment is new complete equipment used in gold trade to recover gold from the gold-carrying carbon. It is suitable for desorption and electrolysis of gold-carrying carbon with different grades. The desorption is an intermixture of 1~2% sodium cyanide and 1~4% sodium hydroxide. The desorption solution is pumped to the heater by circulating pump and heated to the desired temperature. Then the solution flows downward to the bottom of desorption column, through the gold-carrying carbon in the column and upward to the top of it. During flowing, the solution strip gold from the carbon (at this stage the solution containing gold is called as pregnant solution). The pregnant solution runs out from the top of the column and into the electrolytic cell. In cell, the gold in the solution is electrically deposited in the steel wool of the cathode frame, and the rest (called as lean solution) flows back to desorption solution cell and recycled.
The gold mud containing rich gold and silver is taken out of desorption cell and transported to the separation section.
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