کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
296254 | 511718 | 2014 | 16 صفحه PDF | دانلود رایگان |
• Steady and transient behaviors of the interfacial heat transfer in a fuel element.
• Non-local averaging volume method for deriving the surface energy equation.
• The method captures significant physical phenomena of the interfacial heat transfer.
• Closure relationships are proposed in order to obtain the temperatures distribution.
• The derived average equation represents an upscaling regarding the local description.
In this paper the surface energy equation for the heat transfer process (HT) between the mixture of fuel (TRISO particles and graphite matrix) and coating in a fuel pebble is derived. The fuel pebble can be treated as a heterogeneous region (mixture of microspheres and graphite) interacting thermally with the homogeneous region (the coating or cladding). These two regions are separated by a boundary region where the properties and behavior differ from those of the adjoining regions. The methodology applied for deriving the surface energy equation is based on the classical theory on interfacial transport phenomena. The surface energy equation derived in this work is an average equation that represents an upscaling respect to the local description. The regions around the surface where changes in the physical phenomena are important are of the order of microns, in contrast with interfacial mass transfer between phases that may be several molecular diameters. The numerical analysis regarding the application of surface energy equation is presented in this work.
Journal: Nuclear Engineering and Design - Volume 280, December 2014, Pages 269–284