Flow and thermal characteristics analysis of plate-finned tube and annular-finned tube heat exchangers for in-line and staggered configurations

• Autorzy: Sakib S. , Al-Faruk A.
• Języki publikacji: EN

Abstrakty

EN

As the effective selection of fin can greatly enhance the performance of heat exchanger, heat transfer and pressure drop performance on the air-side of annular and rectangular finned tube heat exchangers were numerically investigated. Two types of tube arrangement (in-line and staggered alignment) were examined for 6 different air flow rate for both the heat exchangers using computational fluid dynamics software package ANSYS FLUENT. Renormalization group theory (RNG) based k-ε turbulence model was employed to handle the unsteady three-dimensional flow and the conjugate heat transfer characteristics. The exit temperature were determined from the simulated results and then the LMTD, heat transfer rate and air-side heat transfer coefficient were calculated. The numerical flow visualization results revealed few important aspects, such as, the development boundary layers between the fins, the formation of the horseshoe vortex system, and the local variations of the velocity and temperature on the fin geometries. The result shows that as the air flow rate increased the exit temperature decreased but the overall heat transfer increased. Staggered configuration shows higher heat transfer characteristics over the in-line configuration. The rectangular finned tube shows 17 to 24% improvement in heat transfer over the annular finned tube.

Słowa kluczowe

EN

finned tube heat exchangers; tube arrangement; exit temperature; heat transfer coefficient

PL

wymiennik ciepła z rurami ożebrowanymi; układ rur; temperatura wyjściowa; współczynnik przenikania ciepła

• Wydawca: Wydawnictwo Politechniki Łódzkiej
• Czasopismo: Mechanics and Mechanical Engineering
• Rocznik: 2018
• Tom: Vol. 22, nr 4
• Strony: 1407--1417
• Opis fizyczny: Bibliogr. 12 poz., il. kolor., rys., wykr.

Twórcy

autor

Sakib S.

autor

Al-Faruk A.

• Department of Mechanical Engineering, Khulna University of Engineering & Technology, Khulna - 9203, Bangladesh

Bibliografia

• [1] Kim, Y. H., Kim, Y. C., Kim, J. R., Sin, D. S.: Effects of Fin and Tube Alignment on the Heat Transfer Performance of Finned-Tube Heat Exchangers with Large Fin Pitch, International Refrigeration and Air Conditioning Conference (2004) Paper 716M. Young, The Technical Writer’s Handbook. Mill Valley, CA: University Science, 1989.
• [2] Mon, M. S., Gross, U.: Numerical study of fin-spacing effects in annularfinned tube heat exchangers, International Journal of Heat and Mass Transfer, 47, 1953-1964, 2004.
• [3] Choi, J. M., Kim, Y., Lee, M., Kim, Y.: Air Side Heat Transfer Coefficients of Discrete Plate finned-Tube Heat Exchangers with Large? n Pitch, Applied Thermal Engineering, 30, 174-180, 2010.
• [4] Rao, A. K., Saxena, B. B., Kirar, R.: CFD Analysis of Elliptical Pin Heat Sink, International Journal of Engineering Research & Technology, 2, 3, 2013.
• [5] Joardar, A. and Jacobi, A. M.: Heat Transfer Enhancement by Winglet-Type Vortex Generator Arrays in Compact Plain-Fin-And-Tube Heat Exchangers, International journal of refrigeration, 31, 87-97, 2008.
• [6] Lee, M., Joo, Y., Kang, T., Kim Y.: Heat Transfer Characteristics of Spirally-Coiled Circular Fin-Tube Heat Exchangers Operating Under Frosting Conditions, International Journal of Refrigeration, 34, 328-336, 2011.
• [7] Bahirat, S., Joshi, P. V.: CFD Analysis of Plate Fin Tube Heat Exchangers for Various Fin Inclinations, International Journal of Engineering Research and Applications, 4, 8, 116-125, 2014.
• [8] Lin, M. Z., Wang, B. L., Zhang, H. Y.: Numerical Study on Heat Transfer Enhancement of Circular Tube Bank Fin Heat Exchanger with Interrupted Annular Groove Fin, Applied Thermal Engineering, 1-12, 2014.
• [9] Romero, R. M., Sen, M., Yang, K. T., McClain, R.: Effect of Fin Spacing on Convection in a Plate Fin and Tube Heat Exchanger, International Journal of Heat and Mass Transfer, 43, 39-51, 2000.
• [10] Bergman, T. L., Lavine, A. S., Incropera, F. P., Dewitt, D. P.: Fundamental of Heat and Mass Transfer, Seventh edition, John Wiley & Sons, Inc.
• [11] Holman, J. P., Heat Transfer, Tenth Edition, McGraw-Hill, Inc.
• [12] ANSYS Fluent Theory Guide, Release 15.0, ANSYS, Inc.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).