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Influence of the degree of thermal contact in fin and tube heat exchanger A numerical analysis.pdf

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Influence of the degree of thermal contact in fin and tube heat exchanger A numerical analysis.pdf

Applied Thermal Engineering 107 (2016) 612–624 Contents lists available at ScienceDirect Applied Thermal Engineering journal homepage: /locate/apthermeng Research Paper In?uence of the degree of thermal contact in ?n and tube heat exchanger: A numerical analysis Shobhana Singh ?, Kim S?rensen, Thomas J. Condra Department of Energy Technology, Aalborg University, Pontoppidanstr?de 101, 9220 Aalborg, Denmark highlights Signi?cance of thermal contact area between ?ns and tubes is numerically studied. 3D steady state modeling based on ?nite element method is carried out. Conjugate heat transfer mechanism coupled with turbulent ?ow is simulated. In?uence of degree of thermal contact area on overall performance is estimated. Results deliver insights to the physical phenomena at different thermal contact area. article info Article history: Received 30 October 2015 Revised 14 May 2016 Accepted 3 July 2016 Available online 5 July 2016 Keywords: Fin and tube heat exchanger Thermal contact area Steady state numerical modeling Conjugate heat transfer Overall heat transfer coef?cient abstract Present work aims to investigate the signi?cance of thermal contact area between ?ns and tubes in a heat exchanger. The heat exchanger type selected for the study is a liquid-gas ?n and tube heat exchanger. Four different cases namely I, II, III, and IV, based on a variable degree of thermal contact between ?ns and tubes are investigated. Case-I with 100% thermal contact area between the ?n and tube is set as a reference to cases-II, III, and IV with a thermal contact area of approximately 70%, 50%, and 35%, respectively. Three-dimensional (3D) steady-state numerical models based on ?nite element method (FEM) are developed for the different cases studied. Conjugate heat transfer mechanism coupled with turbulent ?ow is simulated to elucidate temperature and velocity pro?les. In order to develop a simpli?ed model with desired physical phenomena, only gas-side ?ow over the ?n is simu