油の流れの局所的微小温度分布のレーザー干渉計測法の開発

1. 采用瞬态热线法同时测定了矿物油和苯的导热系数和比热系数。通过求解轴对称热扩散方程在拉普拉斯域中严格得到的导线温度，用bellman的演算方法在时域上进行了数值反演。证实了通过测量通过加热丝的透射光轨迹的变化来测量热物性的可能性。计算并测量了具有温度梯度的平行平面上的温度和速度分布。计算结果与实测相符。计算结果表明，油冷却器内的制冷量与流量的对数成正比，这是由于壁面形成热边界层，热量以传导方式传递。为提高制冷量，应采用加热油与冷却油混合的紊流方式。在丙烯酸矩形通道中，随着流量的增加，从节流器边缘延伸出来的流线变得清晰可见。通过对节流阀下游油温的测量，发现流线为阴影。油的澄清变形产生的温升改变了油的密度和折射率，使透射光发生弯曲，产生阴影。

1. The thermal conductivity and specific feat of mineral oil and benzene were simultaneously measured by the transient hot-wire method. The wire temperature rigorously obtained by solving the axisymmetrical thermal diffusion equation in the Laplace domain is numerically inverted into the time domain by the calculus developed by Bellman.2. It was confirmed that the possibility of measurement of thermophysical properties by measuring the change of transmitted light trajectory passing by the heated wire.3. The temperature and velocity distribution in the parallel planes with temperature gradient were calculated and measured. The calculation results coincided with the measurements. And the results of calculation showed that the cooling capacity in the oil cooler is in proportion to the logarithm of flow rate, because thermal boundary layer is formed on the wall and heat is conveyed by conduction. For the improvement of cooling capacity, the flow should be turbulent flow because of mixing heated oil and cooled one.4. In the acrylic rectangular channel, the streamline stretching from the edge of the choke became visible as the flow rate increased. By the measurement of oil temperature of downstream of choke, it was fond that the streamline is shadow. The temperature rise produced by clarification with deformation of oil changes the density and refractive index of oil, therefore the transmitted light is curved and makes shadow.