剪切作用下颗粒物料的传热传质特性

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-04-04 DOI:10.1016/j.ijheatmasstransfer.2025.127039

Xi Long Zhou, Xiang Jun Liu

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引用次数: 0

摘要

颗粒流的传热传质特性对各种工业应用中处理颗粒物料的设计和操作具有重要意义。本文旨在揭示不同剪切作用下颗粒流动的扩散率和有效导热系数（ETC）的规律。采用离散元法对颗粒剪切流动、传质传热过程进行了数值模拟。研究了不同剪切作用下颗粒运动、扩散和传热的详细行为。提出了体积分数和颗粒扩散系数随惯性数的表达式。通过对颗粒流动和扩散特性的分析，区分了接触导热和波动传热两种不同的传热机制。提出了接触导热系数和视波动导热系数随惯性数的表达式。并对表观热扩散率与质量扩散率进行了类比分析，其比值为0.5934。

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Heat and mass transfer characteristics of granular materials under shear actions

The heat and mass transfer characteristics of granular flow are of great significance for the design and operation of various industrial applications for treating granular materials. This paper aims to reveal the laws of granular diffusivity and effective thermal conductivity (ETC) of granular flow under different shear actions. Discrete element method simulations of granular shear flow, mass and heat transfer process are conducted. The detailed behaviors of particle motion, diffusion, as well as heat transfer under different shear actions are investigated. Expressions of volume fraction and granular diffusivity with inertial number are proposed. Two different mechanisms of contact heat conduction and fluctuation heat transfer are distinguished based on the analysis of granular flow and diffusion characteristics. Expressions of contact thermal conductivity and apparent fluctuation conductivity with inertial number are proposed. Moreover, an analogy analysis of the apparent thermal diffusivity to mass diffusivity is conducted, and the ratio is 0.5934 in this study.

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来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer