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首页> 外文期刊>International Journal of Heat and Mass Transfer >Temperature distribution and local heat flux in the unidirectional freezing of antifreeze-protein solution
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Temperature distribution and local heat flux in the unidirectional freezing of antifreeze-protein solution

机译：抗冻蛋白溶液单向冻结中的温度分布和局部热通量

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Experiments have been conducted on the unidirectional freezing of dilute aqueous solutions of winter flounder antifreeze protein, which are 0.02 mm thick, between two cover glasses on the stage of a microscope. The instantaneous temperature field has been obtained by measuring the intensity of near-infrared light with a near-infrared camera. In addition, the local protein concentration has been measured separately using the brightness of fluorescence emitted from molecules tagged to the protein. It is found that the temperature distribution in the ice region near the ice/water interface is similar to that predicted from the modified Neumann solution. Furthermore, the temperature measurement made using the near-infrared light with a specific wavelength is verified. In addition to this, in the case of antifreeze protein solutions, serrated interfaces are observed. The sum of the conduction heat flux of a protein solution near the front edge of the serrated interface and the heat flux for solidification is lower than the conduction heat flux of ice. On the other hand, the sum of the conduction heat flux of protein solution near the bottom edge of the serrated interface and the heat flux for solidification is higher than the conduction heat flux of ice. The balance of heat flux is obtained by taking account of heat convection due to high-concentration regions of protein. These regions move to the deepest parts of the interface and form narrow liquid regions inside the ice. The convection is maintained by the heat conduction in a direction perpendicular to the direction of ice growth. Not only protein adsorption to the interface but also the heat conduction/convection contributes to the modification of ice growth in the non-equilibrium state.
机译：在显微镜载物台上，在两副盖玻片之间，对厚达0.02mm的冬比目鱼防冻蛋白稀水溶液进行了单向冷冻实验。通过使用近红外摄像机测量近红外光的强度，可以获得瞬时温度场。另外，已经使用从标记到蛋白质上的分子发出的荧光的亮度分别测量了局部蛋白质浓度。发现在冰/水界面附近的冰区中的温度分布与根据修正的Neumann解预测的温度分布相似。此外，验证了使用具有特定波长的近红外光进行的温度测量。除此之外，在抗冻蛋白溶液中，观察到锯齿状界面。锯齿状界面的前边缘附近的蛋白质溶液的传导热通量与凝固的热通量之和比冰的传导热通量低。另一方面，锯齿状界面的底部边缘附近的蛋白质溶液的传导热通量与凝固的热通量之和比冰的传导热通量高。通过考虑由于蛋白质的高浓度区域引起的热对流来获得热通量的平衡。这些区域移动到界面的最深部分，并在冰内部形成狭窄的液体区域。通过在垂直于冰生长方向的方向上的热传导来保持对流。不仅蛋白质吸附到界面上，而且热传导/对流也有助于改变非平衡状态下冰的生长。

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