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此前对微通道传热性能研究所用的实验工质绝大多数属于低粘性流体,针对高粘性流体的研究很少。本研究以航空煤油和水为实验工质,在层流状态范围Re数为10-100,对两种流体在微通道中的传热性能进行了实验研究。铝基微通道阵列包括163条横截面尺寸为1 mm×1 mm、长度400 mm的微通道。微通道长径比l/Dh=400。实验发现,两种流体的实验结果平均Nu数均基本不随Re数变化,但小于理论预测值。煤油和水在实验微通道中的传热性能没有本质的区别。在测量误差范围内,航空煤油总体平均Nu数比水大10%左右,分别为2.80和2.59。
Previously, most of the experimental working fluids used for the study of the heat transfer performance of microchannels belong to the low-viscosity fluid, and few studies have been done on the highly viscous fluids. In this study, the aviation kerosene and water were used as experimental working fluids, and the Reynolds numbers in the laminar flow regime ranged from 10 to 100. The heat transfer performance of the two fluids in microchannels was studied. The aluminum-based microchannel array includes 163 microchannels with a cross-section of 1 mm × 1 mm and a length of 400 mm. Microchannel aspect ratio l / Dh = 400. The experimental results show that the average Nu numbers of the experimental results of the two fluids basically do not change with the Re number, but less than the theoretical prediction. There is no essential difference in the heat transfer performance between kerosene and water in experimental microchannels. Within the measurement error range, the overall average Nu number of aviation kerosene is about 10% larger than that of water, at 2.80 and 2.59 respectively.