ライブラリ登録: Guest

# NANOFLUIDS FLOW SIMULASION AS THE FLOW THROUGH THE POROUS MEDIA

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.330
pages 451-467

Amarin Tongkratoke
Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon 47000 Thailand

Anchasa Pramuanjaroenkij
Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon 47000 Thailand

Apichart Chaengbamrung
Department of Mechanical Engineering, Kasetsart University, Bangkok, 10900, Thailand

Department of Mechanical Engineering,TOBB University of Economics and Technology, Ankara-Turkey; and LIPING CAO, Westinghouse Electric Company, LLC, PA; and Department of Mechanical Engineering, University of Miami, Florida - USA

## 要約

Since nanofluids combine of the base fluid and a very small amount of nanoparticles having dimensions from 1 to 100 nm, and high thermal conductivities, the nanofluids could be considered as a large amount of base fluid flowing in a high porosity media. This work presented a mathematical model which has been developed for the steady flow of the base fluid in the porous medium of the Al2O3 nanoparticles. The flow was to be under fully developed laminar flow condition through a rectangular pipe as in the electronic circuit application. The governing equations written in terms of the primitive variables were solved through an in-house program by using the finite volume method and the SIMPLE algorithm. The effects of the simulated porosity, permeability and thermal conductivity models in the porous media were studied. The nanofluid heat transfer coefficients were changed when the porosity, permeability and thermal conductivity in the calculation were adjusted. The relationships between the nanofluid heat transfer coefficient and the distance along the rectangular pipe at different nanofluid volume fraction of 0.01% and 0.02% were presented. Firstly, the digit numbers of the porosity values did not affect the heat transfer coefficients. The wall node number providing more accuracy results; 10 wall nodes occupied by the Hamilton and Crosser model were chosen as the proper node number. The different permeability occurred in materials, which were manufactured differently and in different shapes, influenced the heat transfer coefficients differently, the more permeability the closer heat transfer coefficients to the experimental ones. Finally, the mixing thermal conductivity model which could improve the simulation performance in the previous work was examined and coupled with the porous model. The final results showed that the mixing thermal conductivity model could improve the numerical results to be closer to the experimental results trivially; by the forth digit. From this study, the developed mathematical model was found to demonstrate excellent potential in the nanofluid simulation as the porous media.

## ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH