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CCD digital image processing in the study of liquid flow

, Below the liquid level in the mold in the position of the deepest premises, air bubbles, that is, one area at the bottom red. In the impact area,[link widoczny dla zalogowanych], near Mold flow Pik was movement under laminar flow, flow only to the impact of pouring the center of the flow impact, the overall state of the region is turbulent. The turbulent flow is mainly caused by the casting, and pouring the liquid flow process of integration into the impact areas are closely related. Therefore, in this introduction to this process: after the casting flow into the surface, there is a stream still maintain the original characteristics of the region, that is, as shown in Figure 5 into the segment, features are: (1) into the stream and washed original liquid into the area with a clear interface between the injected stream to maintain the original flow pattern; (2) there is no bubble formation on the interface. After entering into the stream as shown in Figure 5, the desorption zone is characterized by: (1) stream into the stream but also to maintain the basic form, not Taiyuan Heavy Machinery Institute significantly scattered moments of 2002; (2) stream top-down, more and more surface bubbles, the bubbles into the stream in dense around. Finally, the injection stream into the diffusion zone shown in Figure 5, Features are: - a pouring stream ■ / / LrL ... a ... r ... a {= j. I {lL braided 1r /} f} _ a ==- a, - a / A 1 Figure 5, the liquid mold flow diagram of Fig. 5Schematicdiagramofliquidflowinamould (1) the role of bubbles into the stream, the random fast motion in one direction, and then float to the surface; (2) With the bubble of the random spread of radical differentiation into the stream, along with integration into the bubble liquid. This process is not easily observed, because a large number of bubbles will seriously affect the rise into the stream of observations. In the experiment, we used high-speed video camera and computer system composed of a mobile sampling, flow through the process of sampling,[link widoczny dla zalogowanych], screening out some suitable graphics, the computer processing, reveals the integration into the process. Impact area, in particular the impact zone fluid flow state diffusion region, inferred from the theory in response to the mold surface, solidification of the thickness of the slab has an important influence uneven. The larger the bubble, the more unstable stream, uneven thickness of solidified layer more serious, the more unfavorable to the continuous casting production, but the bubble volume has its positive side, such as: it helps a small proportion of the impurities floating; it can reduce the flow of shares into the injection depth of 2.2 laminar flow shown in Figure 5, in the impact area below the flow in the simulator showed a steady laminar flow movement, but in the actual production, there should be thermal convection and mechanical vibration caused by some kind of flow. 3 Conclusion CCD image. Approach is a powerful tool to study high-speed mobile object, it is better than the human eye to capture the details of fluid flow, to better reveal the continuous casting mold in the liquid flow law, help people to improve the continuous casting technology. References:: 1,[link widoczny dla zalogowanych], utilitarian, and so on. The initial solidification of continuous casting of molten steel flow on effects [J]. Steel, 1998,33 (4) :13-15. : 2 Ting-Ju, et al. Intermittent high frequency magnetic field within the liquid metal casting mold and the slab surface quality of movement [J]. Materials Science,[link widoczny dla zalogowanych], 1997,33 (5): 524.528 [3] Wang Jiannong, et al. Casting and solidification behavior of the initial thermal simulation [J]. Steel, 1998,33 (9) :18-20,: 4] Yang Jiang. Advances in Continuous Casting Simulation [J]. Steel, 1998,33 (9) :66-68. [5],[link widoczny dla zalogowanych], Yu Yong, et al. Transient continuous casting mold friction experimental study [J]. Steel, 1999,4 (4): 16.19. ProcessingMethodofCCDDigitalPictureandItsApplicationintheStudyofLiquidFlowWEIJi-lin, WANGYou-hong, YUMing-xiang. CUIXiao-chao (TaiyuanHeavyMachineryInstitute, Taiyuan030024, China) Abstract: Inthispaper, theprocessingmethodofCCDdigitalpictureanditsapplicationinthestudyofliquidriowofcontinuouscastingarepresented. Keywords: pictureprocessing; continuouscasting; liquidflow

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