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doi: 10.3850/978-981-08-7614-2_IMPRES010
Numerical Evaluation of Heat Transfer Performance of Helical Coils of Non-Circular Tubes
Jundika Candra Kurnia1, Agus Pulung Sasmito1 and Arun Sadashiv Mujumdar1,2,a
1Department of Mechanical Engineering, National University of Singapore 9 Engineering Drive 1, Singapore 117575.
ampeasm@nus.edu.sg
2Mineral, Metal and Material Technology Centre, National University of Singapore, 9 Engineering Drive 1, Singapore 117575
ABSTRACT
This study addresses heat transfer performance of various configurations of coiled noncircular tubes e.g., in-plane spiral ducts, helical spiral ducts and conical spiral ducts. Laminar flow of a Newtonian fluid in helical coils made of square cross-section tubes is simulated using the computational fluid dynamic approach. Effects of tube Reynolds number, fluid Prandtl number, coil diameter etc are quantified and discussed. Both constant wall temperature and constant heat flux conditions are simulated. The effect of in-plane coil versus a cylindrical design of constant coil as well as a conical coil design is discussed. Results are compared with those for a straight square tube of the same length as that used to form the coils. Advantages and limitations of using coiled tubes are discussed in the light of the numerical results.
Keywords: Coil, Noncircular tube, Heat transfer performance, Mathematical model.
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