Flow characteristics of pure refrigerants and refrigerant mixtures in adiabatic capillary tubes |
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| Affiliation: | 1. School of Mechanical Engineering, Pusan National University, Jangjeon-dong, Geumjeong-gu, Busan, Republic of Korea;2. Fast Reactor Technology Development Division, Korean Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong, Daejeon 305-353, Republic of Korea;1. DISMA, Department of Mathematical Sciences, Politecnico di Torino, Turin, Italy;2. School of Mathematical Sciences, Monash University, Clayton, Australia;3. Dipartimento di Matematica, Universita di Catania, Catania, Italy;4. Department of Mathematical Sciences, Lakehead University, Thunder Bay, ON, P7B 5E1, Canada;1. Department of Power Mechanical Engineering, National Tsing-Hua University, Hsinchu City 30013, Taiwan, ROC;2. Department of System and Naval Mechatronic Engineering, National Cheng-Kung University, Tainan City 701, Taiwan, ROC;1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;2. Guangdong University Heat Pump Engineering Technology Development Center, Shunde Polytechnic, Foshan 528333, China;3. Institute of Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8563, Japan |
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| Abstract: | This paper provides the results of simulations using an adiabatic capillary tube model which is developed to study the flow characteristics in adiabatic capillary tubes used as a refrigerant control device in refrigerating systems. The developed model can be considered as an effective tool of capillary tubes' design and optimization for systems using newer alternative refrigerants. The model is validated by comparing with the experimental data of Li et al. and Mikol for R12 and Melo et al. for R134a. In particular, it has been possible to compare various pairs of refrigerants. It is found that the conventional refrigerants consistently give longer capillary lengths than the alternative refrigerants. For all pairs, the conventional refrigerant consistently give lower pressure drops for both single-phase and two-phase flow which resulted in longer tube lengths. In addition, an example of capillary tube selection chart developed from the present numerical simulation is shown. The chart can be practically used to select the capillary tube size from the flow rate and flow condition or to determine mass flow rate directly from a given capillary tube size and flow condition. The results of this study are of technological importance for the efficient design when systems are assigned to utilize various alternative refrigerants. |
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