航空煤油在微通道中传热性能的实验研究

Experimental Study of the Heat Transfer Performance of Aviation Kerosene in Microchannels

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。

The majority of working media used in tests by the predecessors to study the heat transfer performance of microchannels pertain to fluids with a low viscosity and very few pertains to fluids with a high viscosity.With aviation kerosene and water serving as the working medium respectively in the test and Reynolds number in the laminar flow state ranging from 10 to 100,the heat transfer performance of two fluids in microchannels was experimentally studied.The aluminium-base microchannel array included 163 microchannels with their section sizes being 1 mm×1 mm and the length being 400 mm.The length/diameter ratio l/Dh =400.Under the condition of such a length/diameter ratio,the influence of the inlet section on the overall heat transfer performance can be neglected.It has been found from the test results during the test that the average Nusselt numbers of two fluids are all basically not varied with a change of Re,however,smaller than the theoretical predictive values.From such a sense,the heat transfer performances of kerosene and water have no substantial difference.In addition,within the measurement error range,the overall average Nusselt number of aviation kerosene is about 10% higher than that of water and their average Nusselt numbers are 2.80 and 2.59 respectively.