Study on Energy Transfer of Droplet Heating by Thermal Radiation

YUAN Yang; ZHANG Dan; JIA Jinrui; ZHENG Jugan; WANG Yixiao

doi:10.7652/xjtuxb202302014

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Study on Energy Transfer of Droplet Heating by Thermal Radiation

更新时间：2025-07-09

- Study on Energy Transfer of Droplet Heating by Thermal Radiation
- Vol. 57, Issue 2, Pages: 131-140(2023)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 中国核能动力研究设计院,成都,610213
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202302014
  CLC： TK124
- Online First：10 February 2023，
  
  Published：2023
- 稿件说明：
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YUAN Yang, ZHANG Dan, JIA Jinrui, et al. Study on Energy Transfer of Droplet Heating by Thermal Radiation[J]. 2023, 57(2): 131-140.
DOI：

YUAN Yang, ZHANG Dan, JIA Jinrui, et al. Study on Energy Transfer of Droplet Heating by Thermal Radiation[J]. 2023, 57(2): 131-140. DOI： 10.7652/xjtuxb202302014.

摘要

为了提高热辐射对液滴群的加热效率

针对单个液滴接收平行热辐射后的反射、吸收、透射等能量传递过程开展研究

采用区域法建立了能量传递过程的计算模型

在液滴吸收系数为1～1 000 m

-1

、液滴粒径为0.1～10 mm、液滴折射率为1.1～2.0范围内

计算分析了液滴温度场的演化与液滴吸收率、液滴反射辐射、透射辐射的数量和空间分布。结果指出:在反射环节

液滴的反射率仅取决于液滴的折射率; 随着折射率的增大

液滴反射率增大

反射辐射的空间分布也由顺投射方向占优逐渐转变为逆投射方向占优

现有研究范围内反射率不超过14%; 在吸收环节

提高液滴吸收系数、折射率的同时减小液滴粒径是使液滴获得快速、均匀温升的有效途径; 粒径的减小会导致液滴吸收率降低

使大量热辐射以透射的形式离开液滴; 这部分透射辐射与反射辐射可被再次利用

统称为二次辐射; 在透射环节

透射辐射总量随吸收系数、折射率或液滴粒径的减小均会增大; 透射辐射的分布以顺投射方向占优。根据上述结果

给出了液滴吸收率、透射辐射定向辐射强度的经验关联式

该经验式与定义式计算结果主体偏差分别小于10%和15%; 据此绘制了二次辐射数量与构成的分布图

显示随着液滴吸收系数、粒径或折射率的减小

二次辐射逐渐由反射占优变为透射占优。研究结果可为热辐射加热液滴群的应用中热辐射波段的选择和液滴群的布局等问题提供参考。

Abstract

In order to improve the efficiency of droplet heating by thermal radiation

this paper focuses on the energy transfer processes such as reflection

absorption

and transmission after parallel thermal radiation is projected on a single droplet. A calculation model of transfer process is established using zone method. With this model

the evolution of droplet temperature field

and the quantity and spatial distribution of droplets tha

t absorb

reflect

and transmit radiation are calculated with droplet absorption coefficient between 1 and 1 000 m

-1

droplet diameter between 0.1 and 10 mm

and droplet refractivity between 1.1 and 2.0. Results suggest that

during reflection

the droplet reflectivity only depends on the droplet refractivity. As the refractivity increases

the reflectivity increases too

and the dominance of projection direction gradually shifts to the reverse projection direction in terms of spatial distribution of the reflected radiation. The reflectivity within the current range of study is no more than 14%. During absorption

improving the droplet absorption coefficient and refractivity while reducing the droplet size is an effective way to obtain rapid and uniform temperature rise of droplet. However

the decrease in particle size leads to decrease of droplet absorption rate

and a large amount of thermal radiation energy leaves the droplet by transmission. These transmitted and reflected radiations can be reused and are collectively defined as the secondary radiation. During transmission

the total amount of transmitted radiation increases with the decrease of absorption coefficient

refractivity or particle size of droplet

while the distribution of transmitted radiation is dominated by the projection direction. The empirical correlations about the droplet absorptivity and the directional radiation intensity of transmitted radiation are fitted based on the conclusions above. The relative error between these empirical correlations and their definition falls within 10% and 15% respectively. On these grounds

the quantity and composition distribution of secondary radiation is plotted and the plot shows that the secondary radiation gradually turns from reflection-dominant to transmission-dominant with the decrease of droplet size

absorption coefficient or refractivity. The result of this study provides a reference for the selection of thermal radiation source and the layout of droplets in the application of drople

t heating by thermal radiation.

关键词

Keywords

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