<?xml version="1.0" encoding="UTF-8"?> <article key="pdf/15506" mdate="2010-11-29 00:00:00"> <author>Arash Karimipour and M. Afrand and M. M. Bazofti</author> <title>Periodic Mixed Convection of a Nanofluid in a Cavity with Top Lid Sinusoidal Motion</title> <pages>1150 - 1155</pages> <year>2010</year> <volume>4</volume> <number>11</number> <journal>International Journal of Mechanical and Mechatronics Engineering</journal> <ee>https://publications.waset.org/pdf/15506</ee> <url>https://publications.waset.org/vol/47</url> <publisher>World Academy of Science, Engineering and Technology</publisher> <abstract>The periodic mixed convection of a watercopper nanofluid inside a rectangular cavity with aspect ratio of 3 is investigated numerically. The temperature of the bottom wall of the cavity is assumed greater than the temperature of the top lid which oscillates horizontally with the velocity defined as u u0 sin (&amp;omega; t). The effects of Richardson number, Ri, and volume fraction of nanoparticles on the flow and thermal behavior of the nanofluid are investigated. Velocity and temperature profiles, streamlines and isotherms are presented. It is observed that when Ri &amp;lt; 1, heat transfer rate is much greater than when Ri &amp;gt; 1. The higher value of Ri corresponds to a lower value of the amplitude of the oscillation of Num in the steady periodic state. Moreover, increasing the volume fraction of the nanoparticles increases the heat transfer rate.</abstract> <index>Open Science Index 47, 2010</index> </article>