THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

Numerical investigation of irregular behavior of the helically coiled tube heat exchanger with pitch changes

ABSTRACT
The convective heat transfer coefficient of the shell-side of helically coiled tube heat exchangers are numerically investigated in the present study. The purpose of the present study is the evaluation of the influence of geometrical parameters on local convective heat transfer coefficients. The flows in both coil-and shell-side of the heat exchangers are set to be fully laminar and steady. Grid independency for the numerical simulation is implemented and the results are validated against corresponding experimental measurements. The highlights of the present simulation is the fluid-to-fluid model of the heat exchangers and calculation of exact local heat transfer coefficients and its variation with respect to pitch changes that is mostly prohibitive to conduct through experimental measurements on the same type of compact heat exchangers, in terms of the complexity of the thermal energy exchange mechanisms. It is concluded from the results that the optimum pitch for the helically coiled tube that provides maximum heat transfer coefficients are achievable at some intermediate pitch values.
KEYWORDS
PAPER SUBMITTED: 2021-06-21
PAPER REVISED: 2022-02-08
PAPER ACCEPTED: 2022-02-10
PUBLISHED ONLINE: 2022-03-05
DOI REFERENCE: https://doi.org/10.2298/TSCI210621022M
REFERENCES
  1. H. Mirgolbabaei, H. Taherian, G. Domairry and N. Ghorbani, Numerical estimation of mixed convection heat transfer in vertical helically coiled tube heat exchangers, International Journal for Numerical Methods in Fluids, vol. 66, pp. 805-819, 2011.
  2. H. Mirgolbabaei, Numerical investigation of vertical helically coiled tube heat exchangers thermal performance, Applied Thermal Engineering, vol. 136, pp. 252-259, 25 May 2018.
  3. N. Ghorbani, H. Taherian, M. Gorji and H. Mirgolbabaei, Experimental study of mixed convection heat transfer in vertical helically coiled tube heat exchangers, Experimental Thermal and Fluid Science, vol. 34, pp. 900-905, 2010.
  4. N. Ghorbani, H. Taherian, M. Gorji and H. Mirgolbabaei, An experimental study of thermal performance of shell-and-coil heat exchangers, International Communications in Heat and Mass Transfer, vol. 37, p. 775-781, 2010.
  5. H. M. Maghrabie, M. Attalla and A. A. A. Mohsen, Performance of a shell and helically coiled tube heat exchanger with variable inclination angle: Experimental study and sensitivity analysis, International Journal of Thermal Sciences, vol. 164, June 2021.
  6. A. A. R. Darzi, M. Abuzadeh and M. Omidi, Numerical investigation on thermal performance of coiled tube with helical corrugated wall, International Journal of Thermal Sciences, vol. 161, March 2021.
  7. G. Wang, T. Dbouk, D. Wang, Y. Pei, X. Peng, H. Yuan and S. Xiang, Experimental and numerical investigation on hydraulic and thermal performance in the tube-side of helically coiled-twisted trilobal tube heat exchanger, International Journal of Thermal Sciences, vol. 153, July 2020.
  8. H. Yong, X.-s. Wang, H.-n. Zhang, Q.-z. Chen and Z. Zhang, Multi-objective optimization of helically coiled tube heat exchanger based on entropy generation theory, International Journal of Thermal Sciences, vol. 147, January 2020.
  9. N. H. Abu-Hamdeh, R. A. R. Bantan and I. Tlili, Analysis of the thermal and hydraulic performance of the sector-by-sector helically coiled tube heat exchangers as a new type of heat exchangers, International Journal of Thermal Sciences, vol. 150, April 2020.
  10. H. K. Versteeg and W. Malalasekera, An Introduction to Computational Fluid Dynamics: The Finite Volume Method, Lognman Scientific & Technical, 1995.
  11. A. N. Dravid, K. A. Smith, E. W. Merrill and P. L. Brian, Effect of secondary fluid motion on laminar-flow heat-transfer in helically-coiled tubes, AICHe Journal, vol. 17, no. 5, p. 1114-1122, September 1971.
  12. E. F. Schmidt, Wärmeübergang und Druckverlust in Rohrschlangen, Chemie Ingenieur Technik, vol. 39, no. 13, p. 781-789, 10 JUly 1967.