Please use this identifier to cite or link to this item:
https://hdl.handle.net/20.500.11851/6276
Title: | Analysis of Transient Laminar Forced Convection of Nanofluids in Circular Channels |
Authors: | Sert, İsmail Ozan Uzol, Nilay Sezer Kakaç, Sadık |
Keywords: | [No Keywords] |
Publisher: | Amer Soc Mechanical Engineers |
Source: | ASME International Mechanical Engineering Congress and Exposition -- NOV 09-15, 2012 -- Houston, TX |
Abstract: | In this study, forced convection heat transfer Characteristics of nanofluids are investigated by numerical analysis of incompressible transient laminar flow in a circular duct under step change in wall temperature and wall heat flux. The thermal responses of the system are obtained by solving energy equation under both transient and steady-state conditions for hydrodynamically fully developed flow. In the analyses, temperature dependent thermo-physical properties are also considered. In the numerical analysis, Al2O3/water nanofluid is assumed as a homogenous single-phase fluid. For the effective thermal conductivity of nanofluids, Hamilton-Crosser model is used together with a model for Brownian motion in the analysis which takes the effects of temperature and the particle diameter into account. Temperature distributions across the tube for a step jump of wall temperature and also wall heat flux are obtained for various times during the transient calculations at a given location for a constant value of Peclet number and a particle diameter. Variations of thermal conductivity in turn, heat transfer enhancement is obtained at various times as a function of nanoparticle volume fractions, at a given nanoparticle diameter and Peclet number. The results are given under transient and steady-state conditions; steady-state conditions are obtained at larger times and enhancements are found by comparison to the base fluid heat transfer coefficient under the same conditions. |
URI: | https://hdl.handle.net/20.500.11851/6276 |
ISBN: | 978-0-7918-4523-3 |
Appears in Collections: | Makine Mühendisliği Bölümü / Department of Mechanical Engineering Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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