A modified homogeneous relaxation model for CO2 two-phase flow in vapour ejector

7th European Thermal-Sciences Conference

Haida, M.^1 ; Palacz, M.^1 ; Smolka, J.^1 ; Nowak, A.J.^1 ; Hafner, A.^2 ; Banasiak, K.^3

Institute of Thermal Technology, Silesian University of Technology, Gliwice, Poland^1

NTNU Department of Energy and Process Engineering, Trondheim, Norway^2

SINTEF Energy Research, Trondheim, Norway^3

关键词: Computational tools;    Fully automated;    Operating condition;    Relaxation models;    Suction nozzles;    Supermarket refrigeration;    Two phase flow model;    Two-phase ejector;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/745/3/032159/pdf
DOI  :  10.1088/1742-6596/745/3/032159

来源: IOP

【 摘 要 】

In this study, the homogenous relaxation model (HRM) for CO2flow in a two-phase ejector was modified in order to increase the accuracy of the numerical simulations The two- phase flow model was implemented on the effective computational tool called ejectorPL for fully automated and systematic computations of various ejector shapes and operating conditions. The modification of the HRM was performed by a change of the relaxation time and the constants included in the relaxation time equation based on the experimental result under the operating conditions typical for the supermarket refrigeration system. The modified HRM was compared to the HEM results, which were performed based on the comparison of motive nozzle and suction nozzle mass flow rates.