ADVANCED CFD METHODOLOGY TO INVESTIGATE HIGH- TEMPERATURE COMPLEX WIRE NET MICRO HEAT EXCHANGER PERFORMANCE

Jojomon Joseph (1, 2) , Michel Delanaye (1) , Rabia Nacereddine (1) , Juergen Brandner (2)

1 MITIS
2 KIT - Karlsruhe Institute of Technology

The objective of this paper is to predict micro heat exchanger performance for a micro Combined Heat and Power systems by a detailed modelling of complex microchannels and a new CFD methodology to assess the entire heat exchanger characteristics based on reduced order modelling. CFD methodology comprises of Conjugate Heat Transfer models and Reduced order models. This could reduce the computational size to a considerable large extent (billion cells to few million cells) with good accuracy. The porous medium model, based on Darcy-Forchheimer law is modified (Constant Integration Method) to account for the temperature evolution. They have been implemented and verified. The best-revised methodology allows obtaining pressure losses with less than three percent error with respect to the 3D CFD CHT modelling. Higher order turbulence models were used to investigate the influence of mesh on heat exchanger performance. A parametric study was conducted to study the influence of microchannel parameters on heat exchanger performance.

Mots clés: Conjugate heat transfer; Micro channels; Counter flow; Wire net heat exchanger.

Domaines: Génie mécanique [physics.class-ph]; Mécanique des fluides [physics.class-ph]; Thermique [physics.class-ph]

Jojomon Joseph, Michel Delanaye, Rabia Nacereddine, Juergen Brandner. ADVANCED CFD METHODOLOGY TO INVESTIGATE HIGH- TEMPERATURE COMPLEX WIRE NET MICRO HEAT EXCHANGER PERFORMANCE. Proceedings of the 5th European Conference on Microfluidics – µFlu18 3rd European Conference on Non-Equilibrium Gas Flows – NEGF18, Feb 2018, Strasbourg, France. ⟨hal-02406575⟩