ライブラリ登録: Guest
ICHMT DL ホーム 今年 アーカイブ 執行委員会 熱・物質移動国際センター

NUMERICAL INVESTIGATION OF LAMINAR FORCED CONVECTION OF NANOFLUIDS IN CIRCULAR PIPES UNDER UNIFORM WALL HEAT FLUX AND CONSTANT WALL TEMPRATURE

DOI: 10.1615/ICHMT.2008.CHT.1990
17 pages

Mehrdad Raisee
School of Mechanical Engineering, College of Engineering, University of Tehran, Center of Excellence in Design and Optimization of Energy Systems (CEDOES), Tehran, Iran

Mostafa Moghaddami
University of Tehran

Zahra Niroobakhsh
Department of Mechanical Engineering, Faculty of Engineering, P.O. Box: 11365/4563, Tehran, Iran

要約

This paper examines the effects of adding metallic nanoparticles γAl2O3 on the heat transfer enhancement of water flow through pipe under both constant wall temperature and uniform wall heat-flux thermal boundary conditions. Two nanofluid models are employed for computations. The first model (simpler model) is based on experimental works of Masuda et al. [1993], Lee et al. [1999] and Wang et al. [1999], while the second model, which considers the Brownian motion of nanoparticles, is proposed by Koo and Kleinstreuer [2004] based on experimental data of Das et al. [2003]. The numerical results are obtained using a 2D finite-volume code. The pressure field is obtained with the SIMPLE algorithm. Advective volume-face fluxes are approximated using the QUICK scheme. Comparisons of numerical results with experimental data of Zeinali et al. [2007] showed the first model underpredicts the heat transfer levels, while the second model which include the Brownian motion, return correct heat transfer level. Moreover, the first model predicts unrealistically high pressure drop. As expected, the addition of nanoparticles enhances the heat transfer. The lowest heat transfer enhancement is about 10% for φ = 1%, while the highest is around 30% for φ = 4%. It is also found the use of nanofluids for heat transfer enhancement is more efficient at lower Reynolds numbers.

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