Numerical analysis of refrigerant flow along non-adiabatic capillary tubes using a two-fluid model |
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| Authors: | AL Seixlack MR Barbazelli |
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| Affiliation: | 1. Department of Internal Combustion Engines and Thermodynamics, Graz University of Technology, Inffeldgasse 19, 8010 Graz, Austria;2. SES-Tec OG (Scientific & Engineering Simulation – Technology), Plüddemanngasse 39, 8010 Graz, Austria;1. Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;3. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;4. Department of Aerospace Engineering, Sharif University of Technology, Tehran, Iran;1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;2. Shunde Polytechnic, Guangdong 528333, China;1. Mechanical Engineering Department, Covenant University, P.M.B. 1023, Ota, Nigeria;2. Mechanical Engineering Department, University of Lagos, Akoka, Lagos, Nigeria;3. Mathematics Department, Covenant University, P.M.B. 1023, Ota, Nigeria;1. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran |
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| Abstract: | This work presents a numerical model to simulate steady state refrigerant flow along capillary tube-suction line heat exchangers, commonly used in small refrigeration systems. The flow along the straight and horizontal capillary tube is divided into two regions: a single-phase and a two-phase flow region. The flow is taken as one-dimensional and the metastable flow phenomenon is neglected. The two-fluid model is employed for the two-phase flow region, considering the hydrodynamic and the thermodynamic non-equilibrium between the liquid and vapor phases. Comparisons are made with experimental measurements of the mass flow rate and temperature distribution along capillary tube-suction line heat exchangers working with refrigerant R134a in different operating conditions. The results indicate that the present model provides a good estimation of the refrigerant mass flow rate. Moreover, comparisons with a homogeneous model are also made. Some computational results referring to the quality, void fraction and velocities of each phase are also presented and discussed. |
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