• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat and mass transfer in a square microchannel with asymmetric heating
【24h】

Heat and mass transfer in a square microchannel with asymmetric heating

机译：方形微通道中不对称加热的传热传质

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper describes the heat and mass transfer in a square microchannel that is heated from one side. This microchannel represents a reaction channel in a microreactor that is used to study the kinetics of the catalytic partial oxidation of methane. The microchannel is contained in a silicon wafer and is covered by a thin silicon sheet. At the top side of this sheet, heating elements are present which mimic the heat that is produced as a result of the exothermic chemical reaction. Correlations for Nusselt and Sherwood numbers as a function of the Graetz number are derived for laminar and plug flow conditions. These correlations describe the heat and mass transport at the covering top sheet of the microchannel as well as at its side and bottom walls. By means of computational fluid dynamic simulations, the laminar flow is studied. To determine an approximate laminar flow Nusselt correlation, the heat transport was solved analytically for plug flow conditions to describe the influence of changes in the thermal boundaries of the system. The laminar flow case is experimentally validated by measuring the actual temperature distribution in a 500 μm square, 3 cm long, microchannel that is covered by a 1 μm and by a 1.9 μm thick silicon sheet with heating elements and temperature sensors on top. The Nusselt and Sherwood correlations can be used to readily quantify the heat and mass transport to support kinetic studies of catalytic reactions in this type of microreactor.
机译：本文介绍了从一侧加热的方形微通道中的传热和传质。该微通道代表微反应器中的反应通道，用于研究甲烷催化部分氧化的动力学。微通道包含在硅晶片中，并被薄硅片覆盖。在该片的顶侧，存在加热元件，其模仿由放热化学反应产生的热量。对于层流和塞流条件，得出了Nusselt和Sherwood数与Graetz数的关系。这些相关性描述了微通道覆盖的顶层以及其侧壁和底壁处的热量和质量传递。通过计算流体动力学模拟，研究了层流。为了确定近似的层流Nusselt相关性，分析了塞流条件下的热传递，以描述系统热边界变化的影响。层流情况通过在500μm正方形，3 cm长的微通道中测量实际温度分布进行了实验验证，该微通道被1μm和1.9μm厚的硅片覆盖，顶部带有加热元件和温度传感器。 Nusselt和Sherwood相关性可用于轻松量化热量和质量传递，以支持这种类型的微反应器中催化反应的动力学研究。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号