HEAT TRANSFER ENHANCEMENT IN LAMINAR CONVECTIVE HEAT TRANSFER WITH NANOFLUIDS

2011-06-03
Özerinç, Sezer
YAZICIOGLU, A. G.
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 experimental data available in the literature, and it is shown that this approach underestimates the heat transfer enhancement. Furthermore, predictions of a recent correlation based on a thermal dispersion model are also examined, and good agreement with the experimental data is observed. The thermal dispersion model is further investigated through a single-phase, temperature-dependent thermal conductivity approach. Numerical analysis of hydrodynamically fully developed laminar forced convection of Al2O3(20 nm)/water nanofluid inside a circular tube under constant wall temperature and constant wall heat flux boundary conditions has been carried out. Results of the numerical solution are compared with the experimental data available in the literature. The results show that the single-phase assumption with temperature-dependent thermal conductivity and thermal dispersion is an accurate way of heat transfer enhancement analysis of nanofluids in convective heat transfer.

Suggestions

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...
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,...
Unravelling convective heat transfer in the rotated arc mixer
Speetjens, M.F.M.; Başkan Perçin, Özge; Metcalfe, G.; Clercx, H.J.H. (2014-01-01)
Thermal homogenization is essentially a transient problem and convective heat transfer by (chaotic) advection is known to accelerate this process. Convective heat transfer traditionally is examined in terms of heat-transfer coefficients at domain walls and characterised by Nusselt relations. However, though of proven worth, such Nusselt relations offer limited insight into the underlying thermal transport phenomena. This study seeks to address this by considering convective heat transfer from an alternative...
Heat transfer enhancement in water-feldspar upflows through vertical annuli
Ozbelge, TA; Koker, SH (1996-01-01)
Although there are many industrial applications of liquid-solid flows in technology, the available knowledge of heat transfer to or from such flows is limited. In this study the effects of parameters on the enhancement of heat transfer from water-feldspar slurries flowing turbulently upwards in vertical annuli were investigated and the experimental conditions beneficial to the enhancement of heat transfer were determined. It was found that the heat transfer enhancement in upflow of slurries through a vertic...
Convective heat transfer enhancement with nanofluids: The effect of temperature-variable thermal conductivity
Özerinç, Sezer; Kakaç, Sadik (2010-07-14)
A nanofluid is defined as the suspension of nanoparticles in a base liquid. Studies in the last decade have shown that significant amount of thermal conductivity and heat transfer enhancement can be obtained by using nanofluids. In the first part of this study, classical forced convection heat transfer correlations developed for pure fluids are used to predict the experimental values of heat transfer enhancement of nanofluids. It is seen that the experimental values of heat transfer enhancement exceed the e...
Citation Formats
S. Özerinç and A. G. YAZICIOGLU, “HEAT TRANSFER ENHANCEMENT IN LAMINAR CONVECTIVE HEAT TRANSFER WITH NANOFLUIDS,” 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53563.