Diffusion-based modeling of film growth of hydrates on gas-liquid interfaces
Diffusion-based modeling of film growth of hydrates on gas-liquid interfaces
复制标题
DOI：
10.1016/j.ces.2021.116456
复制
发表时间：
2021-02-08
影响因子：
4.7
通讯作者：
Bahadur, Vaibhav
中科院分区：
文献类型：
--
作者：
Kar, Aritra;Bhati, Awan;Bahadur, Vaibhav
气体水合物的形成分三个阶段：成核、薄膜生长和本体生长。根据过去的文献，薄膜生长速率（在气-液界面上）取决于从薄膜前沿附近到周围介质的热传递。我们的分析表明，传热并不是薄膜生长的重要因素，正如之前所认为的那样。然后，我们提出了另一种薄膜生长理论，该理论认为薄膜生长受气体扩散限制。我们注意到，气体通过水合物的扩散是块体生长的限制现象；我们目前表明，气相扩散也是薄膜生长的限制现象。这一基于基础的分析模型不需要先前研究中引用的重要假设，并且仅依赖于一个拟合参数。重要的是，该模型与纯气体和气体混合物中水合物薄膜生长的实验结果非常吻合。 (C) 2021 Elsevier Ltd. 保留所有权利。
Formation of gas hydrates occurs in three stages: nucleation, film growth, and bulk growth. As per past literature, the rate of film growth (on gas-liquid interface) depends on heat transfer from the vicinity of the film front to the surrounding medium. We present analyses to show that heat transfer is not a significant factor in film growth, as previously believed. We then present an alternative theory for film growth, which considers film growth as gas diffusion limited. We note that gas diffusion through hydrates is a limiting phenomena for bulk growth; we presently show that diffusion from the gas phase is the limiting phenomena for film growth as well. This fundamentals-based analytical model does not need the significant assumptions invoked in previous studies and relies on only one fitting parameter. Importantly, the model shows excellent agreement with experimental results on film growth of hydrates from pure gases and mixtures of gases. (C) 2021 Elsevier Ltd. All rights reserved.