文献类型：期刊文献

英文题名：Numerical simulation of heat and mass transfer during sublimation drying of porcine aorta

作者：Gui, Chao[1,2];Tao, Leren[1,3];Yang, Weifang[2];Zhang, Yaqi[1];Chen, Shanshan[1,2];Shen, Daoming[2];Yang, Lele[1]

第一作者：桂超;Gui, Chao

通讯作者：Tao, LR[1]

机构：[1]Univ Shanghai Sci & Technol, Sch Energy & Power Engn, Shanghai, Peoples R China;[2]Xinxiang Univ, Sch Civil Engn & Architecture, Xinxiang, Henan, Peoples R China;[3]Univ Shanghai Sci & Technol, Shanghai Key Lab Multiphase Flow & Heat Transfer, Shanghai, Peoples R China

第一机构：Univ Shanghai Sci & Technol, Sch Energy & Power Engn, Shanghai, Peoples R China

通讯机构：[1]corresponding author), Univ Shanghai Sci & Technol, 516 Jungong Rd, Shanghai 200093, Peoples R China.

年份：0

外文期刊名：DRYING TECHNOLOGY

收录：;EI(收录号：20213010667678);Scopus(收录号：2-s2.0-85110782438);WOS:【SCI-EXPANDED(收录号:WOS:000673421200001)】；

语种：英文

外文关键词：Freeze-drying; sublimation; numerical simulation; heat and mass transfer; diffusion coefficient

摘要：Freeze-drying is an effective method for aortal preservation. However, there are few studies on heat and mass transfer of aortal freeze-drying. In this study, the contactless weighing device was used to monitor freeze-drying process. The radiation view factor of the aortal segment was estimated, and the quasi-steady state model was used to analyze heat and mass transfer, there was a certain amount of heat flux in the frozen layer, which provided sublimation heat for internal sublimation interface. By theoretical calculation, the vapor diffusion coefficient was determined. The unsteady state model was used for numerical simulation. The simulated result of free water removal ratio was consistent with experiment result. Both heat flux density and mass flux density decreased non-linearly in the early stage, but approximately linearly in the late stage. The velocity of inner and outer sublimation interfaces was almost the same. The nodes temperature gradually increased and finally approached the heating temperature, and the temperature gradient of both dried and frozen layers decreased gradually with drying time. The water vapor pressure gradient was smaller near the aortal wall and larger in the middle region.