Recycle effect on heat transfer enhancement in double-pass heat exchangers under asymmetric isotherm conditions |
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| Affiliation: | 1. Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, India;2. Department of Physics and Centre for Energy Sciences, Indian Institute of Science Education and Research (IISER), Pune 411008, India;1. School of Energy, China University of Geosciences (Beijing), Beijing 100083, China;2. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;1. Institute of Thermal Engineering, Technische Universität Bergakademie Freiberg, Gustav-Zeuner-Straße 7, D-09596 Freiberg, Germany;2. Technical College of Mosul, Cultural Group Street, Mosul, Iraq;3. Engler-Bunte-Institute, Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany;1. Postgraduate Student (PhD Degree), Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil;2. Postgraduate Student (PhD Degree), Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil;3. Postgraduate Student (MsD degree), Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil;4. Postgraduate Student (PhD Degree), Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil;6. Adjunct Professor, Department of Oral and Maxillofacial Surgery, University of Passo Fundo, Paraná, Brazil;5. Adjunct Professor, Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil |
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| Abstract: | The mathematical formulation of a heat transfer flow problem in the recycling parallel-plate heat exchanger under asymmetric wall temperatures was developed theoretically with ignoring axial conduction, and the analytical solution was obtained using a superposition principle and an orthogonal expansion technique in extended power series. The influences of the design parameters of the impermeable-sheet position (∆), and the operating parameters of the Graetz number (Gz), wall temperature ratio (σ) and recycle ratio (R) are examined. Significant heat transfer improvement is obtainable by employing double-pass devices instead of using single-pass ones for a larger Graetz number system. A technical feasibility of the new double-pass device was investigated in terms of the Nusselt number and device performance improvement under the effect of wall temperature ratios. |
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