Heat transfer, friction factor and effectiveness analysis of Fe 3 O 4 /water nanofluid flow in a double pipe heat exchanger with return bend

Heat transfer and overall heat transfer in a double pipe heat exchanger fitted with twisted-tape elements and titanium dioxide nanofluid were studied experimentally. The inner and outer diameters of the inner tube were 8 and 16 mm, respectively, and cold and hot water were used as working fluids in shell side and tube side. The twisted tapes were made from aluminum sheet with tape thickness (d) of 1 mm, width (W) of 5 mm, and length of 120 cm. Titanium dioxide nanoparticles with a diameter of 30 nm and a volume concentration of 0.01% (v/v) were prepared. The effects of temperature, mass flow rate, and concentration of nanoparticles on the overall heat transfer coefficient, heat transfer changes in the turbulent flow regimeRe≥2300, and counter current flow were investigated. When using twisted tape and nanofluid, heat transfer coefficient was about 10 to 25 percent higher than when they were not used. It was also observed that the heat transfer coefficient increases with operating temperature and mass flow rate. The experimental results also showed that 0.01% TiO2/water nanofluid with twisted tape has slightly higher friction factor and pressure drop when compared to 0.01% TiO2/water nanofluid without twisted tape. The empirical correlations proposed for friction factor are in good agreement with the experimental data.

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Effect of Helical Surface Disc Turbulators on Heat Transfer and Friction Factor Characteristics in the Annuli of a Double‐Pipe Heat Exchanger

Chemical Engineering & Technology ◽

10.1002/ceat.201800251 ◽

2019 ◽

Vol 42 (6) ◽

pp. 1205-1213 ◽

Cited By ~ 2

Author(s):

Saurabh Yadav ◽

Santosh K. Sahu

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Friction Factor ◽

Helical Surface ◽

Double Pipe ◽

Pipe Heat

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Study the Effect of SiO2 Nanofluids on Heat Transfer in Double Pipe Heat Exchanger

Revista de Chimie ◽

10.37358/rc.20.5.8119 ◽

2020 ◽

Vol 71 (5) ◽

pp. 117-124

Author(s):

Noor Sabeeh Majeed ◽

Shaymaa Mahdi Salih ◽

Hussam Nadum Abda Lraheemal Ani ◽

Basma Abbas Abdulmajeed ◽

Paul Constantin Albu ◽

...

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Heat Exchanger ◽

Transfer Coefficient ◽

Friction Factor ◽

Sio2 Nanoparticles ◽

Particle Sizes ◽

Nanoparticle Concentration ◽

Double Pipe ◽

Pipe Heat

In this paper the effect of nanofluid is studied in the double pipe heat exchanger counter current flow, the viscosity of nanofluids are measured at different temperatures and different particle sizes. SiO2 nanoparticles are dispersed at different concentrations (0.2-2) % with different particle sizes of (50-25) nm in base fluid of water. The friction factor and heat transfer coefficient are calculated at different nanoparticle sizes, the results showed that the viscosity was increased as nanoparticle concentration increased. The friction factor is increased as SiO2 nanoparticles concentration and increased as nanoparticles size decreased. The heat transfer coefficient increased as nanoparticle concentration increased and particles size decrease.

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