Improved filtered mesoscale interphase heat transfer model

• 作者: Yu Li Yaxiong Yu Chi Zhang Zheqing Huang Qiang Zhou
• 来源期刊: 颗粒学报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Regular Articles
• 页码范围: 176-186
• 页数: 11页
• 语种: 英文

摘要

Mesoscale structures that form in gas-solid flows considerably affect interphase heat transfer.A filtered interphase heat transfer model accounts for the effects of unresolved mesoscale structures is required in coarse-grid simulations.In the literature,researchers obtain the filtered interphase heat transfer coeffi-cient using a correction(Q)to the microscopic interphase heat transfer coefficient.Available models are based on filtered data in the range 0＜Q＜1.However,the percentage of filtered data in the range Q＜0 and Q＞1 is non-negligible.This percentage can reach approximately 20％when the dimensionless filter size is smaller than 1.028(66.7 x the particle diameter).We proposed an improved filtered interphase heat transfer model by considering the data in the range Q＜0 and Q＞1.We evaluated the predictive power of our model in an a priori test.Our model has much better performance than other models when the dimensionless filter size(△)＜8.222.