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Research Article

JCR. 2021; 8(2): 925-937


Numerical Study of Flow Structure and Heat Transfer in Straight, Helical and Spiral Tubes Under Constant Heat Flux and Constant Temperature

Arash Rezaei, Seyed Mehdi Pesteei, Morteza khalilian.

Abstract
In this paper, the structure of flow and convection heat transfer in straight, helical and spiral tube heat exchangers with a circular cross section under constant heat flux and constant temperature have been studied and compared. The simulation was performed using the finite volume method with the help of Fluent software. The numerical study performed in this paper is in a turbulent flow regime with water fluid and the Reynolds range is 37917-70,000 under constant heat flux and constant temperature. The results showed that the Fanning friction coefficient and pressure drop do not depend on the boundary condition on the wall and for heat transfer coefficient and Nusselt number, there is a difference of less than 1% these two boundary conditions. In the case of the fluid mean temperature at constant heat flux, The straight tube has fluid mean temperature and consequently a higher heat transfer rate than the helical and spiral tubes. However, the fluid mean temperature and heat transfer rate are higher for the helical and spiral tubes at the constant wall temperature. For the constant heat flux boundary condition, the fluid mean temperature and the total heat transfer rate in a straight tube are 1.25% and 0.75% higher than their values in helical and spiral tubes, respectively. For the constant temperature boundary condition, the fluid mean temperature and the total heat transfer rate in the helical and spiral tubes are 5.02% and 5.64% higher than their values in straight tube, respectively. Regarding the overall performance (FoM), The results show that in both condition, the straight tube has a higher overall performance (FoM) than the helical and spiral tubes. The results showed that for the constant heat flux mode, the overall performance in straight tube is 23.66% and 24.37% higher than helical and spiral tubes, respectively. Also in the constant temperature boundary condition, the increase in overall performance in straight tube compare to helical and spiral tubes is 18.67% and 19.5% , respectively

Key words: Structure of flow, convection heat transfer , constant heat flux, constant temperature, fluent



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