Continuum Infrared Radiation from High‐Temperature Air and Nitrogen

1963 ◽  
Vol 39 (9) ◽  
pp. 2354-2360 ◽  
Author(s):  
Raymond L. Taylor
Keyword(s):  
High Temperature ◽  
Infrared Radiation

Infrared Radiation Passive Remote Detection of Gas in High Temperature Kiln

2017 ◽  
Vol 37 (8) ◽  
pp. 0801002
Author(s):  
高乾坤 Gao Qiankun ◽  
刘文清 Liu Wenqing ◽  
张玉钧 Zhang Yujun ◽  
高闽光 Gao Minguang ◽  
李相贤 Li Xiangxian ◽  
...  
Keyword(s):  
High Temperature ◽  
Infrared Radiation ◽  
Remote Detection

scholarly journals Desiccation of hemp seeds by high temperature micronization

Food systems ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 197-203
Author(s):  
S. V. Zverev
Keyword(s):  
Experimental Data ◽  
Heat Treatment ◽  
High Temperature ◽  
Infrared Radiation ◽  
Heating Time ◽  
Significant Loss ◽  
Infrared Heating ◽  
Processing Efficiency ◽  
Cereal Products ◽  
Prognostic Accuracy

In several cases, it is necessary to use heat treatment of cereal products to reduce moisture, inactivate some enzymes, increase storability and processing efficiency. One of the methods for heat treatment is high-temperature micronization — heating in a flow of infrared radiation. The method is convenient in the conditions of small and medium-sized enterprises. The aim of the study was to obtain the factual material regarding heating and desiccation of hemp seeds when heating in the flow of infrared radiation and modeling of the heating and desiccation processes. The experimental dependences of a seed temperature and moisture on heating time at different regimes of infrared heat treatment were obtained. Mathematical models were proposed for changes in a seed temperature as a function of time and moisture content depending on a seed temperature and the initial moisture. The desiccation models were based on simplified solutions of the system of differentiated equations of heat and mass transfer obtained by academician V. A. Lykov and his students. Model coefficients were identified by the results of the experiments. Analysis of the obtained coefficients shows that it is possible to use one coefficient in the examined models without a significant loss of the prognostic accuracy. The proposed models describe the experimental data quite well upon constant conditions of infrared heating of hemp seeds (irradiance and temperature in the treatment zone). However, heating conditions significantly affect the time dependence of the relative moisture (W/W0) and temperature increment ΔT(t). At the same time, it follows from the processing results and available experimental data that the character of the dependence W(ΔT) is determined by the initial moisture and is stable (that is, weakly depends on heating conditions).

Density and Surface Tension of Bi2SiO5 Melts

2013 ◽  
Vol 341-342 ◽  
pp. 74-78 ◽  
Author(s):  
Hong Wei Guo ◽  
Zu Xue Mo ◽  
Xiu Feng Wang ◽  
Chang Ren Zhu
Keyword(s):  
Surface Tension ◽  
Optical Properties ◽  
High Temperature ◽  
Infrared Radiation ◽  
Nonlinear Optical ◽  
Experimental Result ◽  
Cooling Method ◽  
A Chain ◽  
Increasing Temperature ◽  
Melt Cooling

Metastable crystal Bi2SiO5 has significant properties including dielectric, thermoelectricity and nonlinear optical properties. Metastable crystal Bi2SiO5 has been successfully prepared by melt cooling method in this study. Surface tension of high-temperature melt Bi2SiO5 was measured by Suspension method; metastable crystal Bi2SiO5 construction was assigned by IR(Infrared Radiation). The experimental result showed that Bi2SiO5 flux density decreased with the increasing temperature in 830-1095°C range; surface tension changed quadratic with the decreasing temperature. The [SiO4]4- anions of Bi2SiO5 originated from the isolated [SiO4] tetrahedron in the glass to a chain connected structure.

Infrared Radiation Characteristics of High-Temperature H2O and CO2 Gas Mixture Jet Flows

2017 ◽  
Vol 37 (7) ◽  
pp. 0726001
Author(s):  
郑海晶 Zheng Haijing ◽  
白廷柱 Bai Tingzhu ◽  
王全喜 Wang Quanxi ◽  
曹峰梅 Cao Fengmei
Keyword(s):  
High Temperature ◽  
Infrared Radiation ◽  
Jet Flows ◽  
Gas Mixture ◽  
Radiation Characteristics ◽  
Co2 Gas

Study on the Influence of Film Cooling on the Flow Field and Infrared Radiation Characteristics in the Divergent Section of a Nozzle

2020 ◽  
Author(s):  
Haoqi Yang ◽  
Qingzhen Yang ◽  
Saile Zhang ◽  
Huicheng Yang ◽  
Yubo He
Keyword(s):  
High Temperature ◽  
Flow Field ◽  
Infrared Radiation ◽  
Film Cooling ◽  
Exhaust System ◽  
Line Pattern ◽  
Radiation Characteristics ◽  
Core Zone ◽  
The Core ◽  
Significant Difference

Abstract As the last part of the convergent divergent nozzle, the divergent section is exposed to high temperature and high-speed airflow and thus, it is more easily to be detected by the infrared detector. It is one of the main sources of the infrared radiation in the exhaust system. Film cooling is applied to protect the wall from hot flow and reduce the infrared radiation. In this paper, the study is conducted on a nozzle with spherical convergence flap in a turbofan engine exhaust system. The effect of film cooling on the internal flow and infrared radiation characteristics of the exhaust system in the divergent section was studied by numerical simulations. The k-ω SST turbulence model was used to simulate the flow field, and the Reverse Monte Carlo Method was employed to calculate the infrared radiation characteristics of the nozzle. Four different kinds of film hole arrangements are involved, they are cylindrical film holes in an in-line pattern, cylindrical film holes in a staggered pattern, converging-expanding film holes in an in-line pattern and converging-expanding film holes in a staggered pattern. The cylindrical film hole and the converging-expanding film hole have a round shape inlet, with an equivalent diameter of d = 5mm on the projection surface perpendicular to the axial direction. Angles between each film hole and the wall surface are 35°. The impact of the heat conduction on the wall was taken into account. The results show that with the given mass flow rate of the coolant, the lengths of the high temperature core zone of the four models with different film cooling structures are slightly shorter than the core zone of the model without cooling structures. However, no significant difference can be found for the length of the core zone of the four models. The average temperature of the wall in the divergent section decreases significantly by using film cooling. No significant difference can be found in the wall temperature distribution for the four models. In the 3∼5μm and 8∼14μm bands, the cooling technique barely affects the infrared radiation of the main exhaust jet flow, while it significantly reduces the infrared radiation of the solid wall in the divergent section, and the decreasing amplitude is from 45% to 51%. Different film hole arrangements result in similar effects on the infrared radiation of the nozzle. Overall, the usage of film cooling in the divergent section of the nozzle effectively reduces the averaged wall temperature and substantially suppresses the solid infrared radiation on the wall. However, the shape and arrangement of the film holes have no significant influence on the infrared radiation intensity and temperature of the wall in the divergent section.

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