张凯,孙鹏,郑斌,徐纪国,王有镗,王振领,王全振,刘永启.颗粒组合角度对近壁颗粒传热特性的影响[J].,2022,21(2):136-143 |
颗粒组合角度对近壁颗粒传热特性的影响 |
Effects of particle combination angle on heat transfer characteristics of particles near the wall |
投稿时间:2020-07-20 修订日期:2020-12-17 |
DOI:10.13738/j.issn.1671-8097.020166 |
中文关键词: 组合角度 近壁面颗粒 余热回收 数值模拟 |
英文关键词: combination angle particles near the wall waste heat recovery numerical simulation |
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目) |
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中文摘要: |
为了探究颗粒堆积结构变化对近壁面颗粒传热过程的影响,构建了近壁面两颗粒的非稳态传热模型,研究了不同初始温度条件下颗粒组合角度变化对近壁面颗粒传热特性的影响规律。结果表明:初始温度越高,所需换热时间越长,颗粒组合角度增加,使得换热时间明显减少。初始温度为1073K时,换热面平均热流密度值呈先迅速下降后缓慢下降的趋势。同一时刻,组合角度越大,颗粒平均温度越低。不同组合角度颗粒的固相传热率均达到0.8以上。颗粒组合角度越大,固相传热占比越小,辐射传热占比越大。在换热前期,辐射传热率最高可达0.57,对传热过程的影响不可忽略。 |
英文摘要: |
To investigate the effect of the change of particle stacking structure on the heat transfer process of the par-ticles near the wall, an unsteady heat transfer model of two particles near the wall was established, and the effect of the particle combination angle on the heat transfer characteristics of the particles near the wall under different initial temperature conditions was studied. Results show that: the higher the initial tem-perature condition, the longer the required heat transfer time, and the increase of the particle combination angle, which significantly reduces the heat transfer time. When the initial temperature is 1073K, the aver-age heat flux of the heat exchange surface shows a trend of rapid decline first and then a slow decline. At the same time, the larger the combined angle, the lower the average temperature of the particles. The sol-id-phase heat transfer rates of particles with different combination angles all reach above 0.8. The larger the particle combination angle, the smaller the solid phase heat transfer rate and the greater the radiation heat transfer rate. In the early heat transfer process, the radiation heat transfer rate can reach up to 0.57, and its influence on the heat transfer process cannot be ignored. |
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