Entropy Analyses of Droplet Combustion in Convective Environment with Small Reynolds Number

张小斌; 张伟; 张学军

doi:10.1016/S1004-9541(13)60526-1

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Entropy Analyses of Droplet Combustion in Convective Environment with Small Reynolds Number

化工热力学 | Updated：2026-01-06

- Entropy Analyses of Droplet Combustion in Convective Environment with Small Reynolds Number
- Entropy Analyses of Droplet Combustion in Convective Environment with Small Reynolds Number
- 中国化学工程学报（英文版） 2013年第6期页码：654-6621004-954160526-1
- Affiliations：
  
  Institute of Refrigeration and Cryogenics, Zhejiang University,Hangzhou,China,310027
- Author bio：
- Funds：
  
  Supported by the National Natural Science Foundation of China (51276157) and the Natural Science Foundation of Zhejiang Province (LY12E060026).
- DOI：10.1016/S1004-9541(13)60526-1
  中图分类号：
- 纸质出版：2013
- Accepted：
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张小斌, 张伟, 张学军. Entropy Analyses of Droplet Combustion in Convective Environment with Small Reynolds Number[J]. 中国化学工程学报（英文版）, 2013,(6):654-6621004-954160526-1.

ZHANG Xiaobin, ZHANG Wei, ZHANG Xuejun. Entropy Analyses of Droplet Combustion in Convective Environment with Small Reynolds Number[J]. Chinese Journal of Chemical Engineering, 2013, (6): 654-6621004-954160526-1.
张小斌, 张伟, 张学军. Entropy Analyses of Droplet Combustion in Convective Environment with Small Reynolds Number[J]. 中国化学工程学报（英文版）, 2013,(6):654-6621004-954160526-1. DOI： 10.1016/S1004-9541(13)60526-1.

ZHANG Xiaobin, ZHANG Wei, ZHANG Xuejun. Entropy Analyses of Droplet Combustion in Convective Environment with Small Reynolds Number[J]. Chinese Journal of Chemical Engineering, 2013, (6): 654-6621004-954160526-1. DOI： 10.1016/S1004-9541(13)60526-1.

摘要

Abstract

This paper analyzes the entropy generation rate of simple pure droplet combustion in a temperature-elevated air convective environment based on the solutions of flow

and heat and mass transfer between the two phases. The flow-field calculations are carried out by solving the respective conservation equations for each phase

accounting for the droplet deformation with the axisymmetric model. The effects of the temperature

velocity and oxygen fraction of the free stream air on the total entropy generation rate in the process of the droplet combustion are investigated. Special attention is given to analyze the quantitative effects of droplet deformation. The results reveal that the entropy generation rate due to chemical reaction occupies a large fraction of the total entropy generated

as a result of the large areas covered by the flame. Although

the magnitude of the entropy generation rate per volume due to heat transfer and combined mass and heat transfer has a magnitude of one order greater than that due to chemical reaction

they cover a very limited area

leading to a small fraction of the total entropy generated. The entropy generation rate due to mass transfer is negligible. High temperature and high velocity of the free stream are advantageous to increase the exergy efficiency in the range of small Reynolds number (1) from the viewpoint of the second-law analysis over the droplet lifetime. The effect of droplet deformation on the total entropy generation is the modest.

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