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.用瞬时热线法同时测定了矿物油和苯的导热系数和比表面积。通过求解拉普拉斯域内的轴对称热扩散方程，得到了严格意义上的线材温度，并利用Bellman提出的微积分方法将其数值逆推到了时间域内。证实了通过测量透射光经过加热丝的轨迹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面内的温度和速度分布。计算结果与实测值基本吻合。计算结果表明，油冷却器的制冷量与流量的对数成正比，这是因为壁面上形成了热边界层，热量是通过传导来传递的。为了提高制冷量，由于加热的油和冷却的油混合在一起，流动应该是湍流。在亚克力矩形流道中，随着流量的增加，从节流管边缘延伸出来的流线变得清晰可见。通过对节流管下游油温的测量，发现流线呈阴影状。由于油的变形而产生的澄清温升改变了油的密度和折射率，因此透射光是弯曲的，形成阴影。

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.