Sensitivity Analysis on Thermal Performance of Gas Heater with Finned and Finless Tubes using Characteristics-based Method

Document Type : Original Article


1 School of Mechanical Engineering, University of Tabriz, Tabriz, Iran

2 School of Mechanical Engineering, University of Bonab, Bonab, Iran

3 School of Automotive Engineering, Iran University of Science and Technology, Tehran, Iran


Natural gas must be preheated to prevent phase change and gas hydrate in pressure reduction stations. This paper aims to investigate the effect of the fins of gas tubes and their configuration, arrangement, and shape on the heat transfer and thermal efficiency of gas. To conduct a parametric study, two tube cases with fins and without fins, and in the finned case for the fin’s configuration, two longitudinal and circular arrangements, and the formation of the fins, two solid and interrupted forms were analyzed. Also, three types of cross-sections, including rectangular, convergent parabolic, and divergent parabolic, for the shape of the fins have been studied. For this simulation, the three-dimensional, incompressible, and steady flow was considered, and for analysis and discretization of convective heat equations, the characteristic-based method was applied. FORTRAN software was also used to implement and solve the equations. The results show that in solid and interrupted fins and increasing the number of fins in parallel, the dimensionless heat transfer coefficient increases. Also, the dimensional heat transfer coefficient decreases with increasing the ratio of fin height to the tube’s diameter. Also, the most significant heat transfer improvement was related to the divergent parabolic cross-section.


1.     Adibi, T., "Evaluation of using solar ammonia absorption cooling system for major cities of the middle east", International Journal of Heat and Technology,  Vol. 36, No. 3, (2018), 840-846. doi:
2.     Adibi, T., Razavi, S.E. and Adibi, O., "A characteristic-based numerical simulation of water-titanium dioxide nano-fluid in closed domains", International Journal of Engineering, Transactions A: Basics,  Vol. 33, No. 1, (2020), 158-163. doi:
3.     Rahimpour, M.R., Saidi, M., Baniadam, M. and Parhoudeh, M., "Investigation of natural gas sweetening process in corrugated packed bed column using computational fluid dynamics (CFD) model", Journal of Natural Gas Science and Engineering,  Vol. 15, (2013), 127-137. doi:
4.     Al-Sobhi, S.A. and Elkamel, A., "Simulation and optimization of natural gas processing and production network consisting of lng, gtl, and methanol facilities", Journal of Natural Gas Science and Engineering,  Vol. 23, (2015), 500-508. doi:
5.     Ahmadi, M., Mostafavi, G. and Bahrami, M., "Natural convection from rectangular interrupted fins", International Journal of Thermal Sciences,  Vol. 82, (2014), 62-71. doi:
6.     Sajedi, R., Taghilou, M. and Jafari, M., "Experimental and numerical study on the optimal fin numbering in an external extended finned tube heat exchanger", Applied Thermal Engineering,  Vol. 83, (2015), 139-146. doi:
7.     Sebastian, G. and Shine, S.R., "Natural convection from horizontal heated cylinder with and without horizontal confinement", International Journal of Heat and Mass Transfer,  Vol. 82, (2015), 325-334. doi:
8.     Innella, G. and Rodgers, P.A., "The benefits of a convergence between art and engineering", HighTech and Innovation Journal,  Vol. 2, No. 1, (2021), 29-37. doi:
9.     Fazelabdolabadi, B. and Golestan, M.H., "Towards bayesian quantification of permeability in micro-scale porous structures – the database of micro networks", HighTech and Innovation Journal,  Vol. 1, No. 4, (2020), 148-160.doi:
10.   Bayareh, M., Pordanjani, A.H., Nadooshan, A.A. and Dehkordi, K.S., "Numerical study of the effects of stator boundary conditions and blade geometry on the efficiency of a scraped surface heat exchanger", Applied Thermal Engineering,  Vol. 113, (2017), 1426-1436. doi:
11.   Matsunaga, T. and Sumitomo, T., "Heat transfer and pressure loss in double‐tube type heat exchanger with rotating blades", Journal of Research and Applications in Mechanical Engineering,  Vol. 2, No. 1, (2014), 65-73. doi:
12.   Shahsavar Goldanlou, A., Sepehrirad, M., Papi, M., Hussein, A.K., Afrand, M. and Rostami, S., "Heat transfer of hybrid nanofluid in a shell and tube heat exchanger equipped with blade-shape turbulators", Journal of Thermal Analysis and Calorimetry,  Vol. 143, No. 2, (2021), 1689-1700. doi:
13.   Zhang, W., Yang, X., Wang, T., Peng, X. and Wang, X., "Experimental study of a gas engine-driven heat pump system for space heating and cooling", Civil Engineering Journal,  Vol. 5, No. 10, (2019), 2282-2295. doi:
14.   Kostikov, Y.A. and Romanenkov, A.M., "Approximation of the multidimensional optimal control problem for the heat equation (applicable to computational fluid dynamics (CFD)", Civil Engineering Journal,  Vol. 6, No. 4, (2020), 743-768. doi:
15.   Kumar, A., Joshi, J.B., Nayak, A.K. and Vijayan, P.K., "3d cfd simulations of air cooled condenser-ii: Natural draft around a single finned tube kept in a small chimney", International Journal of Heat and Mass Transfer,  Vol. 92, (2016), 507-522. doi:
16.   Kiatpachai, P., Pikulkajorn, S. and Wongwises, S., "Air-side performance of serrated welded spiral fin-and-tube heat exchangers", International Journal of Heat and Mass Transfer,  Vol. 89, (2015), 724-732. doi:
17.   Lorenzini, G., Biserni, C., Correa, R.L., dos Santos, E.D., Isoldi, L.A. and Rocha, L.A.O., "Constructal design of t-shaped assemblies of fins cooling a cylindrical solid body", International Journal of Thermal Sciences,  Vol. 83, (2014), 96-103. doi:
18.   Ashouri, E., Veysi, F., Shojaeizadeh, E. and Asadi, M., "The minimum gas temperature at the inlet of regulators in natural gas pressure reduction stations (CGS) for energy saving in water bath heaters", Journal of Natural Gas Science and Engineering,  Vol. 21, (2014), 230-240. doi:
19.   Adibi, T., Razavi, S.E., Adibi, O., Vajdi, M. and Moghanlou, F.S., "The response of nano-ceramic doped fluids in heat convection models: A characteristics-based numerical approach", Scientia Iranica, (2021). doi:
20.   Adibi, T., Adibi, O. and Razavi, S.E., "A characteristic-based solution of forced and free convection in closed domains with emphasis on various fluids ", International Journal of Engineering, Transactions B; Applications,  Vol. 32, No. 10, (2019), 1679-1685. doi:
21.   Razavi, S.E., Adibi, T. and Faramarzi, S., "Impact of inclined and perforated baffles on the laminar thermo-flow behavior in rectangular channels", SN Applied Sciences,  Vol. 2, No. 2, (2020), 284.doi:
22.   Adibi, T. and Razavi, S.E., "A new characteristic approach for incompressible thermo-flow in cartesian and non-cartesian grids", International Journal for Numerical Methods in Fluids,  Vol. 79, No. 8, (2015), 371-393.doi:
23.   Razavi, S.E. and Adibi, T., "A novel multidimensional characteristic modeling of incompressible convective heat transfer", Journal of Applied Fluid Mechanics,  Vol. 9, No. 4, (2016), 1135-1146. doi:
24.   Adibi, T., "Three-dimensional characteristic approach for incompressible thermo-flows and influence of artificial compressibility parameter", Journal of Computational & Applied Research in Mechanical Engineering,  Vol. 8, No. 2, (2019), 223-234. doi:
25.   Tohid Adibi, Omid Adibi and Amrikachi, A., "Investigation on the possibility of substituting compression cooling cycle with a solar absorption cooling cycle in tropical regions of iran", European Journal of Electrical Engineering,  Vol. 19, No. 1, (2017), 7-17.doi: 10.3166/EJEE.19.7-17
26.   Cesini, G., Paroncini, M., Cortella, G. and Manzan, M., "Natural convection from a horizontal cylinder in a rectangular cavity", International Journal of Heat and Mass Transfer,  Vol. 42, No. 10, (1999), 1801-1811. doi:
27.   Chai, L., Xia, G., Zhou, M., Li, J. and Qi, J., "Optimum thermal design of interrupted microchannel heat sink with rectangular ribs in the transverse microchambers", Applied Thermal Engineering,  Vol. 51, No. 1, (2013), 880-889. doi: