NUMERICAL EVALUATION OF THERMO-HYDRAULIC PERFORMANCE IN FIN-AND-TUBE COMPACT HEAT EXCHANGERS WITH DIFFERENT TUBE CROSS-SECTIONS

Authors

  • Ahmadali Gholami High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • Mazlan Abdul Wahid High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • Hussein A. Mohammed High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • A. Saat High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • M.F. Mohd Yasin High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • M.M. Sies High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • N. Kamaruzaman High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • Md. Mizanur Rahman High Speed Reacting Flow Laboratory, Department of Thermofluids, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia

DOI:

https://doi.org/10.11113/jt.v78.9592

Keywords:

Fin-and-tube compact heat exchanger, Oval, Flat, Heat transfer enhancement, thermo-hydraulic performance, Area goodness factor

Abstract

This study examined numericallythe Thermal-hydrodynamic properties of airflow in the fin-and-tube compact heat exchangers (FTCHEs) with considering different shapes of tubes in lowReynoldsnumbers. The influence of applying flat, oval and circular tube adjustments on the thermal and hydraulic characteristics of air flow were analyzed on the in-line tube arrangements. Establishing standard conditions, the study compared different geometries based on circular tubes of 10.459 mm diameter tubes with 25.4 mm longitudinal pitches and 25.4 mm transverse pitches. The other geometries of tubes were assumed in a stable and constant state preparing the same heat transfer surface area per unit volume as that of the nominal case. The results showed that the FTCHE with flat tubes gives the best area goodness factor (j/f) with in a certainrange of Reynoldsnumbers. In addition, FTCHE with flat tubes shown the best thermo-hydraulic performance and a significant augmentation of up to 10.83% and 35.63% in the average area goodness factor achieved accompanied by a decrease in the average friction factor of 17.02% and 43.41% in the flat tube case compared to the oval and circle tube shapes, respectively. It is concluded that the average area goodness factorfor the oval tube is about 25.04% higher than that of the circular tube, while the average friction factor for the oval tube is about 26.9% lower than that of the circular tube. This means that the flat tube has a better-combined thermal–hydraulic performance than the oval and circle tube.

References

Wahid, M.A, A.A. Gholami, and H. A. Mohammed. 2013. Numerical Study of Fluid Flow and Heat Transfer Enhancement of Nanofluids Over Tube Bank. Appl. Mech. Mater. 388 :149–155.

Gholami, A.A., M.A. Wahid, and H.A. Mohammed.2014. Heat Transfer Enhancement and Pressure Drop for Fin-And-Tube Compact Heat Exchangers with Wavy Rectangular Winglet-Type Vortex Generators, Int. Commun. Heat Mass Transf. 54 :132–140.

Gholami, A., M.A. Wahid, and H.A. Mohammed.2015. Numerical Investigation of the Air-Side Performance in the Corrugated Fin-And-Oval Tube Compact Heat Exchangers, in: Recent Adv. Mech. Mech. Eng., Kuala Lumpur. 134–140.

Hasan, A., and K. Siren. 2004 .Performance Investigation of Plain Circular and Oval Tube Evaporatively Cooled Heat Exchangers. Appl. Therm. Eng. 24 :777–790.

Horvat, A., M. Leskovar, and B. Mavko, 2006 .Comparison of Heat Transfer Conditions in Tube Bundle Cross-Flow for Different Tube Shapes. Int. J. Heat Mass Transf. 49 :1027–1038.

Sayed Ahmed, S.A.E., E.Z. Ibrahiem, O.M. Mesalhy, and M. a. Abdelatief.2014 .Heat Transfer Characteristics of Staggered Wing-Shaped Tubes Bundle at Different Angles of Attack. Heat Mass Transf. 50 :1091–1102.

Comini, G., and G. Croce, 2003 .Numerical Simulation of Convective Heat and Mass Transfer in Banks of Tubes. Int. J. Numer. Methods Eng. 57 :1755–1773.

Khan, W.A., J.R. Culham, and M.M. Yovanovich.2006 .Convection Heat Transfer from Tube Banks in Crossflow: Analytical Approach. Int. J. Heat Mass Transf. 49 :4831–4838.

V.K. Mandhani, R.P. Chhabra, V. Eswaran, 2002 .Forced Convection Heat Transfer In Tube Banks In Cross Flow. Chem. Eng. Sci. 57 :379–391.

He, Y.-L. , P. Chu, W.-Q. Tao, Y.-W. Zhang, and T. Xie, 2012 .Analysis of Heat Transfer and Pressure Drop for Fin-and-Tube Heat Exchangers with Rectangular Winglet-Type Vortex Generators. Appl. Therm. Eng. 61 :770–783.

Han, H. , Y.L. He, Y.S. Li, Y. Wang, and M. Wu, 2013 .A Numerical Study on Compact Enhanced Fin-and-Tube Heat Exchangers with Oval and Circular Tube Configurations. Int. J. Heat Mass Transf. 65 :686–695.

Canonsburg, PA, 2013. ANSYS Workbench User’s Guide, ANSYS Inc.

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Published

2016-08-16

Issue

Vol. 78 No. 8-4: Applied Thermodynamics and Fluid Flow

Section

Science and Engineering

License

Copyright of articles that appear in Jurnal Teknologi belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions, or any other reproductions of similar nature.

How to Cite

NUMERICAL EVALUATION OF THERMO-HYDRAULIC PERFORMANCE IN FIN-AND-TUBE COMPACT HEAT EXCHANGERS WITH DIFFERENT TUBE CROSS-SECTIONS. (2016). Jurnal Teknologi, 78(8-4). https://doi.org/10.11113/jt.v78.9592