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Título:	Numerical simulation of non-adiabatic capillary tubes. Special emphasis on the near-saturation zone
Autor/a:	Ablanque Mejía, Nicolás; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Oliva Llena, Asensio
Otros autores:	Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics; Universitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor
Abstract:	The aim of this article is to present a distributed numerical model that simulates the thermal and fluid-dynamic phenomena inside non-adiabatic capillary tubes. The resolution approach is based on a two-phase flow model where the fluid domain is discretized in a one-dimensional way, and the governing equations (continuity, momentum, and energy) are solved by means of a step-by-step algorithm. The model explained herein consists of an improved and extended version of previous works (Escanes et al., 1995; García-Valladares et al., 2002a,b; Ablanque et al., 2010) including two additional features. On the one hand, it allows the simulation of the two typical geometric arrangements found in capillary-tube/suction-line heat exchangers (i.e. concentric and lateral). On the other hand, it has an enhanced capability to address the convergence difficulties found in distributed models at the near-saturation zone. This document presents the major numerical adaptations done to the model, a comprehensive validation of the two geometric configurations, the model performance when tackling the aforementioned numerical difficulties and finally, some numerical studies.
Abstract:	Peer Reviewed
Materia(s):	-Àrees temàtiques de la UPC::Energies::Termoenergètica::Refrigeració -Two-phase flow -Refrigeration and refrigerating machinery -Capillarity -Refrigeration -Expansion device -Capillary tube -Two-phase flow -Convergence -Numerical model -Froid -Appareil de détente -Tube capillaire -Ecoulement diphasique -Convergence -Modèle numérique -Refrigeració -Capil·laritat
Derechos:	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Tipo de documento:	Artículo - Versión presentada Artículo
Editor:	Elsevier
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