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首页> 外文期刊>International Journal of Heat and Mass Transfer >Pore shape development from a bubble captured by a solidification front
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Pore shape development from a bubble captured by a solidification front

机译：由凝固前沿捕获的气泡产生的孔形状

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摘要

Development of the pore shape from a tiny bubble captured by a solidification front is fundamentally and systematically investigated in this study. Pore formation and its shape in solid influence not only microstructure of materials, but also contemporary issues of various sciences of biology, engineering, foods, geophysics and climate change, etc. In this work, the tiny bubble cap beyond the solidification front is considered to be spherical. As the dominant parameter, the bubble growth rate-solidification rate ratio, decreases, contact angle is found to approach 90°. An accepted criterion, stating that a pore becomes closed as long as the solidification rate is greater than bubble growth rate, is incorrect. This study also finds that the pore can be closed if the bubble radius at contact angle of 90° exhibits a local minimum. Since contact angle of 90° can maintain for a period of time, a subsequent positive bubble growth rate-to-solidification rate ratio readily gives rise to an isolated pore. The pore can be elongated, expanded, shrunk, rippled or closed, depending on the bubble growth rate-to-solidification rate ratio. Manipulating the bubble growth rate or solidification rate to control the pore shape in solid is therefore provided.
机译：在这项研究中，从根本上和系统地研究了由凝固前沿捕获的微小气泡产生的孔隙形状。孔的形成及其在固体中的形状不仅影响材料的微观结构，而且还影响生物学，工程学，食品，地球物理学和气候变化等各种科学的当代问题。在这项工作中，固化前沿以外的微小气泡帽被认为可以球形。作为主要参数，气泡生长速率-凝固速率比率降低，发现接触角接近90°。一个公认的标准是错误的，该标准指出，只要凝固速率大于气泡生长速率，孔就会闭合。该研究还发现，如果接触角为90°的气泡半径呈现局部最小值，则可以封闭孔。由于90°的接触角可以维持一段时间，因此随后的正气泡生长速率与凝固速率之比容易产生孤立的孔。取决于气泡生长速率与凝固速率的比率，孔可以拉长，膨胀，收缩，波纹或封闭。因此，提供了控制气泡的生长速率或固化速率以控制固体中的孔形状。

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