Home – Home – Jornals – Thermophysics and Aeromechanics 2016 number 2

Radiation heat loss is an important type of heat loss in thermal systems. In this work, a numerical study of the transient response of two circular radiation heat shields in-serted between two parallel and circular surfaces of emissivities ε1 and ε2 is pre-sented. The same dimensions have been assumed for the two main radiating surfaces and the two radiation shields. The radiation shields are assumed to have different emissivities on their top (ε3 and ε5) and bottom (ε4 and ε6) surfaces, and both are as-sumed to be different but linear functions of temperature. A specific configuration is investigated in detail to highlight the transient temperature and heat transfer characte-ristics of the system. Some new results for the transient temperature and heat transfer characteristics of the system such as the effect of shield location, shield emissivities, the temperature dependence of shield emissivities, system dimensions, temperatures of the hot and cold surfaces and emissivities of the hot and cold surfaces are pre-sented for future references. It has been observed that increasing the temperature of the first radiation shield by changing a parameter such as surface emissivity or dis-tance between the radiation shield or the temperature of the hot surface, will not nec-essarily decrease the temperature of the second radiation shield.