Coupled Radiative And Conductive Heat Transfer Characteristics In Semitransparent Composite Layer

Coupled radiative and conductive heat transfer means radiation and conduction coexists and interacts at the same time and space,this kind of heat transfer is the main method of energy transfer in semitransparent medium under high temperatures,and some errors will appear if merely consider radiative heat transfer or conduction.Semitransparent medium has an important application value in optical observation,solar energy utilization,information communication technology,astronautical technology and other fields,in recent years,the requirements of thermally protect technology becomes higher due to the development of aerospace science and technology,and the study of coupled radiative and conductive heat transfer in semitransparent medium has an important significance for the reasons above.In the thesis,the Open Source Field Operation and Manipulation(Open FOAM)C++ libraries which were based on Finite Volume Method were used as a research tool,the model to solve radiative heat transfer in it was improved and a computing method was established for calculating and analyzing,the specific topics of this thesis are as follows:(1)A finite volume method was utilized to perform the discrete solution for the heat energy equation and the radiative transfer equation,and then the temperature was solved simultaneously;some kinds of radiation boundary conditions such as specular reflection,diffuse reflection,semitransparent boundary and opaque boundary were established;a kind of domain solving method was adopted to deal with the coupled radiative and conductive heat transfer in semitransparent medium,and the computational information between different layers transferred through theinterface which was established in this thesis.(2)The veracity of the computing method in this thesis was verified by comparing with relevant reference,the veracity include one-dimensional to three-dimensional problems,transient problem,spectral model,specular reflection and diffuse reflection radiation boundary condition,the result shows that the computing method is accurate and has a wide applicability,this method can be used as an useful utilities to study coupled radiative and conductive heat transfer problems.(3)A model of three-dimensional composite was used as an object of study,then the influence of conduction-radiation parameter,specular reflection and diffuse reflection radiation boundary,refractive index,scattering phase function and spectral radiative properties to coupled radiative and conductive heat transfer was studied.