Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Modelling and analysis of closed loop two-phase thermosyphon
Submission Author:
Raphael Ponce Gabri , RJ
Co-Authors:
Raphael Ponce Gabri, Fabio Toshio Kanizawa
Presenter: Raphael Ponce Gabri
doi://10.26678/ABCM.ENCIT2018.CIT18-0161
Abstract
This study aims to present the modelling and analysis of closed loop two-phase thermosyphons. The influence of the system parameters on the performance of thermosyphons such as working fluid, geometry, operating temperature, heat flux and filling ratio are analyzed by numerical simulation. The model comprises conditions of single and two-phase flow, with corresponding predictive methods for each case. It consists in a one-dimensional model, with averaged properties and parameters for each section. The concept of thermosyphons applied for heat management system has potential for applications in a variety of devices, such as in power electronics, electrical machines and nuclear reactor cooling applications. The present study presents modelling and analysis for a two-phase close-loop thermosyphon operating with R245fa, by evaluating local parameters along the circuit, such as flow pattern, void fraction, pressure gradient and heat transfer coefficient for single-phase flow, and for convective boiling and condensation conditions, as well as global parameters as mass flow rate estimation.
Keywords
Thermosyphon, natural circulation loop, Two-phase Flow, theoretical modeling, Flow patterns
