Gold-in-Water Nanofluids in Microchannels: Surfactant Effect

Date

2018-05-25

Author

Şimşek, Eylül
Redmond, Matthew
Koyuncuoğlu, Aziz
Okutucu Özyurt, Hanife Tuba
Külah, Haluk

Metadata

Show full item record

Item Usage Stats

174
views

0
downloads

Heat transfer and pressure drop performance of gold-in-water nanofluids in microchannels are experimentallyinvestigated. Gold nanoparticles are suspended in de-ionized (DI) water. The nanofluid stability is maintained bypolyvinylpyrrolidone (PVP) for over 4 years. Nanofluids are tested in rectangular, MEMS produced coppermicrochannels of 70 μm x 50 μm cross-sectional area in a very low Reynolds number range of 30 < Re < 50.The performances of DI-water, PVP added DI-water, and gold-in-water nanofluid with added PVP arecompared. The nanofluids always yielded a higher heat transfer coefficients than PVP-DI water solution. Foroccasional combinations of the particle size, volumetric concentration and flow rate, gold nanofluids yieldedhigher heat transfer coefficients compared to DI water as well. The effects of flow rate and particle size on thefigure of merit (FM) are presented. The study is rare in dealing with pure metals (gold), and is important inemphasizing the surfactant effects on stable duration of nanofluids, and their thermal performance.

URI

https://hdl.handle.net/11511/79770

DOI

https://doi.org/10.1615/IHTC16.nmt.021973

Conference Name

16th International Heat Transfer Conference (IHTC-16)

Collections

Department of Mechanical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Polyimide and PEBAX flat and hollow fiber membranes for gas separation Özdemir, Nur Konçüy; Kalıpçılar, Halil; Department of Chemical Engineering (2017) This thesis analyzes the effect of polyimide (PI) hollow fiber membrane spinning conditions including dope solution flow rate, bore liquid flow rate, addition of more volatile solvent to dope solution, air gap height and heating zone temperature on the ideal gas separation performance and membrane morphology. The effect of PEBAX1657 coating of PI hollow fiber membrane was also investigated. The effect of incorporation of ZIF-8 crystals to PEBAX1657 flat sheet membrane, the effect of coagulant type for the p...
Numerical analysis of laminar forced convection with temperature-dependent thermal conductivity of nanofluids and thermal dispersion Özerinç, Sezer; Kakac, S. (2012-12-01) Nanofluids are promising heat transfer fluids due to their high thermal conductivity. In order to utilize nanofluids in practical applications, accurate prediction of forced convection heat transfer of nanofluids is necessary. In the first part of the present study, we consider the application of some classical correlations of forced convection heat transfer developed for the flow of pure fluids to the case of nanofluids by the use of nanofluid thermophysical properties. The results are compared with experi...
Thermal stresses in elastic-plastic tubes with temperature-dependent mechanical and thermal properties Orcan, Y; Eraslan, Ahmet Nedim (2001-11-01) The thermoelastic-plastic deformations of internal heat-generating tubes are investigated by considering the temperature dependence of the thermal conductivity coefficient, Young's modulus, the coefficient of thermal expansion, and the yield limit of the material. A model describing the elastic-plastic behavior of the tube is developed. The model consists of a system of two second-order ordinary differential equations and a first-order ordinary differential equation involving nonlinear temperature-dependent...
Performance analysis of grooved heat pipes using 3-D multi-channel thermal resistance network Sezmen, Ramazan Aykut; Dursunkaya, Zafer; Çetin, Barbaros; Department of Mechanical Engineering (2021-9) Heat pipes are phase change heat transfer devices that transfer high amounts of heat with low temperature differences compared to conventional cooling techniques due to their high thermal conductivity. Since heat pipes do not require any external power supply and not involve any moving parts, they are preferred for high reliability applications and in wide range of industrial applications from thermal management of electronics to space applications. Essentially, heat pipes use the advantage of occurring pha...
Enhanced thermal conductivity of nanofluids: a state-of-the-art review Özerinç, Sezer; Yazicioglu, Almila Guevenc (2010-02-01) Adding small particles into a fluid in cooling and heating processes is one of the methods to increase the rate of heat transfer by convection between the fluid and the surface. In the past decade, a new class Of fluids called nanofluids, in which particles of size 1-100 nm with high thermal conductivity are Suspended in a conventional heat transfer base fluid, have been developed. It has been shown that nanofluids containing a small amount of metallic or nonmetallic particles, Such as Al2O3, CuO, Cu, SiO2,...

Citation Formats

E. Şimşek, M. Redmond, A. Koyuncuoğlu, H. T. Okutucu Özyurt, and H. Külah, “Gold-in-Water Nanofluids in Microchannels: Surfactant Effect,” presented at the 16th International Heat Transfer Conference (IHTC-16), Beijing, Çin, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/79770.