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本文对三种高效肋片——纸花肋、齿形肋、铜丝肋与普通平圆肋在吸风式直流风洞上,以热管作为试验芯进行了性能对比实验研究.采用微型计算机(APPLE—Ⅱ)对实验数据进行整理,得出了各种性能关系曲线;并按综合传热和流动阻力的性能比较方法,以平圆肋为基准对各高效肋片进行了比较.实验发现,在迎面风速为1.5～3.5m/s内,纸花肋、齿形肋、铜丝肋的外表面平均放热系数与平圆肋相比所增加的量分别约为:65%、20%、15%,各肋片的性能比值因子约为:1.40、1.14、1.07(平圆肋性能比较因子为1).本文采用改变肋形、达到强化传热以提高气侧放热系数的方法是有效的.我们设计的两种高效肋片——纸花肋、齿形肋,与普通平圆肋相比更经济,适用于空冷换热器以改善换热性能.铜丝肋的经济性在一些场合还不如平圆肋,需要进一步改进.
In this paper, three kinds of high efficiency fins—paper ribs, tooth ribs, copper wire ribs and ordinary flat ribs—were compared on the suction wind dc wind tunnel with the heat pipe as the test core. APPLE-II) collated the experimental data and obtained a variety of performance curves. Based on the comparison of the heat transfer and flow resistance performance comparison methods, the high-efficiency fins were compared on the basis of flat circular ribs. In the face wind speed of 1.5 to 3.5 m/s, the average heat release coefficient of the outer surface of paper ribs, tooth ribs, and copper wire ribs is approximately 65% and 20% higher than that of the flat ribs. For 15%, the performance ratio factors of each fin are approximately: 1.40, 1.14, 1.07 (The performance factor of the flat circular rib is 1.) The method of changing the rib shape to achieve enhanced heat transfer to increase the gas side heat release coefficient is effective. The two kinds of efficient fins we designed, paper ribs and toothed ribs, are more economical than ordinary flat ribs and are suitable for air-cooled heat exchangers to improve heat transfer performance. The economics of copper wire ribs are The occasion is not as good as a round rib, and needs further improvement.