Energy exchanges between subchannels in the bypass region (in case of double duct) and in the inter-assembly gap are modelled as purely conductive. Additionally, the coolant in the inter-assembly gap can be treated as a stagnant fluid to simplify full-core calculations.
This issue is open to explore other approaches to the analysis of these regions. In particular, the Cheng approach [1], already adopted in issue #27 to deal with mixed convection phenomena, can be used to model inter-subchannel mass exchanges.
[1] Cheng, S.K., 1984. Constitutive Correlations for wire-wrapped subchannel analysis under forced and mixed convection conditions (Ph.D. thesis). MIT.
Energy exchanges between subchannels in the bypass region (in case of double duct) and in the inter-assembly gap are modelled as purely conductive. Additionally, the coolant in the inter-assembly gap can be treated as a stagnant fluid to simplify full-core calculations.
This issue is open to explore other approaches to the analysis of these regions. In particular, the Cheng approach [1], already adopted in issue #27 to deal with mixed convection phenomena, can be used to model inter-subchannel mass exchanges.
[1] Cheng, S.K., 1984. Constitutive Correlations for wire-wrapped subchannel analysis under forced and mixed convection conditions (Ph.D. thesis). MIT.