07.2021.370.381

Heat convection enhancement of heat exchanger with cylindrical spring inserts: A numerical analysis

Author(s):

Hiba Hameed Kareem*, Saad Najeeb Shehab

Affiliation(s):

Department of Mechanical Engineering, College of Engineering, Mustansiriyah University, Baghdad, Iraq

Corresponding Author Email: EHma006@uomustansiriyah.edu.iq

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

In this research, the characteristics of thermo-hydraulic for water flow into a double-pipe heat exchanger (DPHE) with cylindrical spring insert inside a tube side was numerically investigated. Three-dimensional numerical simulation of turbulence model utilizing ANSYS-Fluent version 2021 R1 commercial software was performed. Different numbers of cylindrical spring inside a tube side of heat-exchanger, namely four, six and eight besides the smooth (without springs) tube case were simulated. The water as working fluid in both annular and tube sides was used. Various Reynolds numbers in tube side ranging from 4000 to10,000 and it fixed at 7000 in annular side. The aim of present research is to simulate and analyze numerically the influence of cylindrical spring inserts number, Reynolds number and surface temperatures on the thermo-hydraulic characteristics of water flow into a double pipe heat-exchanger under forced heat convective conditions. The numerical results seem that the coefficient of overall heat transfer are greater about 14%, 18.7% and 21.4% for cases of 4, 6 and 8-springs respectively compared with smooth tube case. The large pressure drop occurs in 8-springs case about 2.1 times than that smooth tube. Besides, the 6-springs case has a bigger values of thermal performance factor about 4% and 9.5% than that 8-springs and 4-springs respectively.