DEVELOPMENT OF THE OBSERVATION SYSTEM FOR THE BOUNDARY PHENOMENA IN THE HIGH TEMPERATURE FLUID.

在这项工作中，超声技术被开发用于检测加压高温熔体中的气泡、固体颗粒及其混合物。在第一年期间，该装置的整个系统，例如合适的频率、声功率等，根据单探头实验结果，讨论并设计了一种用于气-固-液混合体系声衰减和声速估算的数学模型。在研制用于高温熔体测量的硬件之前，对材料、形状、声场和耦合等进行了实验讨论。研究结果如下：（1）利用所建立的数学模型，对气泡-液体和固体颗粒-液体两相体系中气泡和固体颗粒的浓度和尺寸进行了超声检测。该模型也适用于三相系统。(2)为将高性能陶瓷材料应用于超声波探头中作为缓冲棒提供了可能。这些材料的使用使系统成本低，用途广泛。(3)讨论了类似线扫描探头的超声多探头的设计。(4)通过对锡液中固体颗粒和上升气泡的检测，验证了该系统对高温锡液的适用性。

In this work, ultrasonic techniques was developed to detect the bubbles, solid particles and their mixtures in pressurized high temperature melts over 400 C.During the first year, total system of the apparatus, for example the suitable frequency, acoustic power etc., was discussed and designed by the results of some experiments with single probe.The following year, a mathematical model to estimate the acoustic attenuations and sound velocities in the mixture of gassolid liquid system was established. Prior to developing the hardware for application to high temperature melts, experimental discussion regarding the material, shape, acoustic field and coupling etc. were made. The results are as follows, (1) Concentration and size of bubbles and solid beads in two phase systems, gas bubble-liquid and solid bead-liquid are estimated by ultrasonic detection with the mathematical model. The model was also applied the three phase systems. (2) It was made possible to apply some high ceramics to the ultrasonic detecting probes as a buffer rod. The use of these materials made the system cost low and wide use. (3) The design of ultrasonic multi-probe like a linear scanning probe was discussed. (4) The applicability of this system to the high temperature melts was found by the detection of solid particles and rising up bubbles in the molten tin.