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

在本工作中，发展了超声检测400℃以上高压高温熔体中气泡、固体颗粒及其混合物的技术。在第一年，根据一些单探头的实验结果，讨论和设计了该仪器的整个系统，如合适的频率、声功率等。次年，建立了估计气固液混合体系中声衰减和声速的数学模型。在研制用于高温熔体的硬件之前，从材料、形状、声场、耦合等方面进行了实验讨论。结果表明：(1)利用超声检测的数学模型，对两相体系、气泡-液体系和固球-液体系中气泡和固球的浓度和大小进行了估计。该模型也适用于三相系统。(2)使一些高陶瓷作为缓冲棒应用于超声探测探头成为可能。这些材料的使用使系统成本低，用途广泛。(3)讨论了类似线性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，发现了该系统对高温熔体的适用性。

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.