CFP last date
20 January 2025
Call for Paper
February Edition
IJCA solicits high quality original research papers for the upcoming February edition of the journal. The last date of research paper submission is 20 January 2025

Submit your paper
Know more
The week's pick
Responsive image
SFLA-Based Line Balancing and Task Optimization in Master-Slave Controlled Hanger Transportation Systems for Garment Production

Duc Hoang Nguyen
Random Articles
Reseach Article

Free Convection of Al2O3 and TiO2 Nanofluids in Enclosure with Two Models of Thermal Conductivity

by Manal Al-hafidh
journal cover thumbnail

International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Volume 117 - Number 2
Year of Publication: 2015
Authors: Manal Al-hafidh
10.5120/20528-2868

Manal Al-hafidh . Free Convection of Al2O3 and TiO2 Nanofluids in Enclosure with Two Models of Thermal Conductivity. International Journal of Computer Applications. 117, 2 ( May 2015), 29-34. DOI=10.5120/20528-2868

@article{ 10.5120/20528-2868,
author = { Manal Al-hafidh },
title = { Free Convection of Al2O3 and TiO2 Nanofluids in Enclosure with Two Models of Thermal Conductivity },
journal = { International Journal of Computer Applications },
issue_date = { May 2015 },
volume = { 117 },
number = { 2 },
month = { May },
year = { 2015 },
issn = { 0975-8887 },
pages = { 29-34 },
numpages = {9},
url = { https://ijcaonline.org/archives/volume117/number2/20528-2868/ },
doi = { 10.5120/20528-2868 },
publisher = {Foundation of Computer Science (FCS), NY, USA},
address = {New York, USA}
}
%0 Journal Article
%1 2024-02-06T22:58:16.884069+05:30
%A Manal Al-hafidh
%T Free Convection of Al2O3 and TiO2 Nanofluids in Enclosure with Two Models of Thermal Conductivity
%J International Journal of Computer Applications
%@ 0975-8887
%V 117
%N 2
%P 29-34
%D 2015
%I Foundation of Computer Science (FCS), NY, USA
Abstract

This paper presents a numerical study of natural convection of nanofluids contained in horizontal cylindrical annular enclosure filled with porous media and subjected to uniform heat flux along the inner cylinder wall. Governing parameters of the problem under study are the modified Rayleigh number Ra (10 ?Ra*? 500) and the solid volume fraction of nanoparticles (0???0. 3. Two types of nano-particles are taken into consideration Al2O3 and TiO2 with water as the based fluid. Two models are used for calculating the effective viscosity and thermal conductivity of nanofluids. The finite difference approximation and the MATLAB-7 program are used to obtain the results. It is found that Adding 0. 5 percent of TiO2 particles cause to increase the value of the local Nu number to 4. 128 for model 1 and to 3. 748 for model 2. Adding Al2O3 particles of 0. 5 percent volume fraction cause an increase the local Nu to 4. 988 for model 1 and to 4. 542 for model2. A maximum value of the average Nu of TiO2 nanofluid is equal 16. 446 for model1 with ?=0. 5 and Ra* =500, while Nu equal 4. 54 for model 2. A maximum value of the average Nu of 18. 0007 for Al2O3 nanofluid for model 1 and 5. 004 for model 2 is obtained with ?=0. 5 and Ra* =500. A correlation of Nu with Ra* and ? is obtained for Al2O3 nanofluid and TiO2 nanofluid model 1.

References
  1. Pop, D. B. Ingham, Convective Heat Transfer: Mathematical and Computational Modeling of Viscous Fluids and Porous Media, Pergamon, Oxford, 2001.
  2. Vafai, K. , Handbook of Porous Media. 2nd edn. Taylor and Francis, New York (2005)
  3. Nield D. A. , Bejan A. , Convection in Porous Media, third ed. , Springer, New York, 2006.
  4. Reddy B. V. K. , Arunn Narasimhan, 2010," Heat generation effects in natural convection inside a porous annulus, International Communications in Heat and Mass Transfer 37 (2010) 607–610
  5. Mina Shahi, Amir Houshang Mahmoudi, Farhad Talebi, 2011," A numerical investigation of conjugated-natural convection heat transfer enhancement of a nanofluid in an annular tube driven by inner heat generating solid cylinder, International Communications in Heat and Mass Transfer 38 (2011) 533–542
  6. Alloui Z. , Vasseur P. , Reggio M. , 2012," Analytical and numerical study of buoyancy-driven convection in a vertical enclosure filled with nanofluids", Heat Mass Transfer (2012) 48:627–639
  7. Nazar R. , Tham L. , Pop I. , Ingham D. B. , 2011," Mixed Convection Boundary Layer Flow from a Horizontal Circular Cylinder Embedded in a Porous Medium Filled with a Nanofluid", Transp Porous Med (2011) 86:517–536.
  8. Esmaeilpour M. , Abdollahzadeh M. , Free convection and entropy generation of nanofluid inside an enclosure with different patterns of vertical wavy walls, International Journal of Thermal Science 52 (2012)127-136.
  9. Wang Bu – Xuan and Zhang Xing, "Natural Convection in Liquid Saturated Porous Media Between Concentric Inclined Cylinders" Int. J. Heat and Mass Transfer Vol. 33. No 5, pp. 827-833, 1990.
  10. Aziz K. and Hellums J. D. , Numerical Solution of the Three Dimensional Equations of Motion for Laminar Natural Convection, The Physics of Fluids, V0l. 10, No. 2, pp. 314 – 324, 1967
  11. Al- Hafidh Manal, Haithem H. Muhammad, Ban B. Jawad, 2014,"Effect of Angle of Rotation for Fiber Aligned in a Composite Material Wall of Inclined Enclosure on Heat Transfer", International Journal of Computer Applications, Volume 92 – No. 12, 975 – 8887April.
  12. Hakan F. Oztop, Eiyad Abu-Nada," Numerical study of natural convection in partially heated rectangular enclosures filled with nanofluids", International Journal of Heat and Fluid Flow, Vol. 29, pp. 1326- 1336, 2008.
Index Terms

Computer Science
Information Sciences

Keywords

Laminar free convection Al2O3 and TiO2 nanofluids porous media horizontal annulus.

Powered by PhDFocusTM