Experimental and Numerical Study of Thermal Efficiency of Helically Coiled Tube Heat Exchanger Using Ethylene Glycol-Distilled Water Based Fe3O4 Nanofluid

• Published in: International journal of thermophysics Vol. 43; no. 8
• Main Authors: Ghaderi, Afshin, Veysi, Farzad, Aminian, Saman, Andami, Zahra, Najafi, Mohammad
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2022; Springer Nature B.V
• Subjects: Classical Mechanics; Coils; Condensed Matter Physics; Distilled water; Ethylene glycol; Flow velocity; Fluid flow; Geophysics; Heat exchangers; Heat transfer; Heat transfer coefficients; Industrial Chemistry/Chemical Engineering; Inlet temperature; Iron oxides; Nanofluids; Nanoparticles; Nusselt number; Physical Chemistry; Physics; Physics and Astronomy; Thermodynamic efficiency; Thermodynamics; Tube heat exchangers; Ethylene glycol; Nusselt number; Helically coiled tube heat exchanger; Nanofluid; Coil diameter
• ISSN: 0195-928X; 1572-9567
• DOI: 10.1007/s10765-022-03041-w

In this study, the effect of Fe 3 O 4 magnetic nanoparticles on the efficiency of helically coiled tube heat exchanger (HCHE) has been investigated both numerically and experimentally. The solution of 20 % Ethylene glycol (EG) and distilled water is used as the base fluid. The effect of parameters including volume fraction of nanoparticles, coil inlet temperature, flow rate at the shell/coil side, and coil diameter on the heat transfer of the heat exchanger has been investigated. The results show that with increasing the flow rate on the coil side, the heat transfer coefficients and the Nusselt number are increased. It was observed that the heat transfer coefficient for the solution of distilled water-ethylene glycol increases by about 60 % with 0.1 volume fraction of Fe 3 O 4 nanoparticles. As the coil inlet temperature increases from 40 ∘ C to 60 ∘ C , the overall Nusselt number increases by 22 %. As expected, as the nanofluid flow rate increases, the heat transfer coefficient increases. For a wide range of flow rates, the internal and external heat transfer coefficients of the coil have been obtained.