Heat Transfer Reduction due to a Ceiling-Mounted Barrier in an Enclosure with Natural Convection

Gamze Gediz Ilis, Moghtada Mobedi, Hakan F. Öztop
2011 Heat Transfer Engineering  
Effects of a ceiling-mounted barrier on natural convection heat transfer in a square cavity with differentially heated wall are numerically investigated. A limit case, in which the partition has small thickness and low thermal conductivity, is studied. The study is performed for nine different locations of barrier on the ceiling, two different lengths of barrier as 15 and 50% of the side wall, and Rayleigh numbers from 10 3 to 10 6 . The vorticity and streamfunction approach is used to obtain
more » ... is used to obtain velocity distribution, and the energy equation is solved to determine temperature field in the cavity. The variations of the local Nusselt number on the hot and cold walls and the change of mean Nusselt number with the location of barrier in the cavities with different Rayleigh numbers are presented. The obtained results show that a wall-mounted barrier can be used to reduce heat transfer rate through the cavity; however, its effectiveness depends on length and location of barrier and Rayleigh number. worked in an HVAC company as a research and development (R&D) project manager between 1999 and 2005. His research interests include computational heat and mass transfer, heat and mass transfer in porous media, adsorption heat pumps, and ventilation in cleanrooms. He currently works on natural convection in cavities, and heat and mass transfer in adsorbent beds of adsorption heat pumps. He has published more than 50 papers in journals and conference proceedings.
doi:10.1080/01457632.2010.483889 fatcat:a5hil4cbqbgezmn2jrrifq4apy