A Homogenization Approach for Studying Two-Phase Heat Exchanger Performance
Two phase heat exchangers (TPHE) present a rather complex behavior. The physical mechanisms underlying multiphase flow and heat and mass transfer and the usual geometries (spiral wound, plate-fin, shell-and-tube condensers) make modeling and design a challenging task. A usual and simple approach consists on considering one representative channel and its longitudinal evolution, disregarding the inherent complexity of the system. However, several coupled scales are present in this type of exchangers, and the overall performance is dependent on all of them and their interaction. The usual geometries can include parallel channels and some internal structures, such as tube plates. The channels structure allows mass, momentum and energy exchange. The objective of this work is to extend the experience on multiscale modeling and homogenization from core analysis to two phase heat exchanger applications. The model developed is based on describing the heat exchanger in term of representative channels which can interact among them exchanging mass, momentum and energy. The final model is solved using a spectral element method based on a least squares formulation. Numerical examples in this work include geometrical and mass flow effects.
Two-phase flow Heat exchanger Homogenization Numerical analysis.
Pacio, J.C Dorao, C.A
Norwegian University of Science and Technology. Department of Energy and Process Engineering Kolbjφrn Hejes vei 1b, Trondheim, Norway, N-7034
国际会议
上海
英文
834-846
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）