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Measurements of Nanofluids Properties and Heat Transfer Computation: Correlations for Nanofluids Properties download ebook

by RAVIKANTH VAJJHA,DEBENDRA DAS

Measurements of Nanofluids Properties and Heat Transfer Computation: Correlations for Nanofluids Properties download ebook
ISBN:
383837214X
ISBN13:
978-3838372143
Author:
RAVIKANTH VAJJHA,DEBENDRA DAS
Publisher:
LAP LAMBERT Academic Publishing (July 16, 2010)
Language:
Pages:
132 pages
ePUB:
1563 kb
Fb2:
1586 kb
Other formats:
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Category:
Engineering
Subcategory:
Rating:
4.4

Heat exchanger specification, nanofluid properties and mathematical formulations were taken from the .

Heat exchanger specification, nanofluid properties and mathematical formulations were taken from the literature to analyze thermal and energy performance of the heat recovery system. It was observed that the convective and overall heat transfer coefficient increased with the application of nanofluids compared to ethylene glycol or water based fluids. However, the conventional correlations for nanofluid heat transfer and friction factor are not suitable and hence various correlations have been developed for the estimation of Nusselt number and friction factor for both laminar and turbulent flow conditions inside a tube with inserts.

The nanofluids superior heat transfer capability depends on its thermophysical properties. The authors of this treatise, from their experimental expertise, have presented useful correlations for the thermophysical properties, which are valuable for engineering applications using nanofluids.

Ravikanth S. Vajjha, Debendra K. Das. 2009 . Experimental investigations have been carried out for determining the thermal conductivity of three nanofluids containing aluminum oxide, copper oxide and zinc oxide nanoparticles dispersed in a bas. More). This paper presents the specific heat measurements of three nanofluids containing aluminum oxide, zinc oxide, and silicon dioxide nanoparticles. The first two are dispersed in a base fluid of 60:4. Abstract Turbulent flow and heat transfer of three different nanofluids (CuO, Al 2 O 3 and SiO 2 ) in an ethylene glycol and water mixture flowing through a circular tube under constant heat flu.

In this study, all of the nanofluid properties are temperature and . Namburu PK, Das DK, Tanguturi KM, Vajjha RS (2009) Numerical study of turbulent flow and heat transfer characteristics of nanofluids considering variable properties. J Thermal Sci 48:290–302.

In this study, all of the nanofluid properties are temperature and nanoparticle volume concentration dependent. The governing equations have been solved using finite volume approach with the SIMPLER algorithm. The results indicate an increase in the averaged heat transfer coefficient with increasing the mass of ethylene glycol in the water base fluid, solid concentration and Reynolds number.

The heat transfer and flow behavior performance of these nanofluid suspensions were studied as a function of various parameter such as rectangular tubes aspect ratio, radius of coil, number of turns, Reynolds number and Dean number.

Measurements of Thermophysical Properties of Nanofluids and Computation of Heat Transfer Characteristics. Ravikanth S Vajjha and Debendra K Das. Specific heat measurement of three nanofluids and development of new correlations,. LAP Lambert Academic Publishing, (2010). In: International Journal of Heat and Mass Transfer 55. 15 (2012). In: Journal of heat transfer 131. 7 (2009), . 71601.

The measurements showed that electrical conductivity of nanofluids increased with an increase in temperature and also with an increase in particle volumetric concentration

The measurements showed that electrical conductivity of nanofluids increased with an increase in temperature and also with an increase in particle volumetric concentration. Download full-text PDF. Source.

The valuation of nanofluid thermo physical properties were done by Sundar et a.

8. Supreeti Das (2015), Nanofluids for Heat Transfer: An Analysis of Thermophysical Properties, IOSR Journal of Applied Physics, Vol. 7, Issue 5, p. 4-40. 17. Ravikanth S. Das (2009), Experimental determination of thermal conductivity of three nanofluids and development of new correlations, International Journal of Heat and Mass Transfer, Vol. 52, p. 675–4682.

The transport properties of nanofluid: dynamic thermal conductivity and .

The measurement of nanofluids critical heat flux (CHF) in a forced convection loop is useful for nuclear applications. They applied the correlations for the convective heat transfer of the single-phase fluid to predict heat transfer coefficient of a nanofluid system, if the volume fraction of particles is. very low.

Keywords: Nanofluids, Thermal conduction, Natural convective heat transfer, Forced convective heat transfer, Boiling heat . This paper aims to provide a brief overview of the thermal properties and behaviour of nanofluids.

Keywords: Nanofluids, Thermal conduction, Natural convective heat transfer, Forced convective heat transfer, Boiling heat transfer, Mechanisms 1. Introduction Nanofluids are dilute liquid suspensions of nanoparticles with at least one critical dimension smaller than ~100nm.

Research during the past decade has shown that dispersions of nanoscale particles in conventional heat transfer fluids, called nanofluids, can enhance its thermal conductivity. The convective heat transfer coefficient of this engineered fluid is substantially higher than that of the base fluid. The nanofluid's superior heat transfer capability depends on its thermophysical properties. The authors of this treatise, from their experimental expertise, have presented useful correlations for the thermophysical properties, which are valuable for engineering applications using nanofluids. Performing three-dimensional numerical investigations, the authors have shown that the use of nanofluids in a radiator can reduce the size of the heat exchanger surface area and the required pumping power in comparison with the base fluid on the basis of equal heat transfer.