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Heat Transfer Characteristics in a Cylindrical Duct Packed with Solid Spheres  

Lee, Seung-Hyuk (School of Mechanical Engineering, Chung Ang University)
Kang, Kwan-Gu (School of Mechanical Engineering, Chung Ang University)
Kim, Sung-Chan (Frontier Technology Innovatin Centre, Chung Ang University)
Ryou, Hong-Sun (School of Mechanical Engineering, Chung Ang University)
Noh, Dong-Soon (Korea Institute of Energy Research)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.13, no.1, 2005 , pp. 11-21 More about this Journal
Abstract
The present paper investigates the heat transfer characteristics in a cylinder packed with porous medium of solid spheres for various parameters such as mass flow rate, sphere diameter, length of the porous medium, and gas temperatures. Pressures and temperatures at the inlet and outlet regions were measured by using static pressure gages and R-type thermocouples. The modified relationship based on the Ergun equation is suggested for the estimation of pressure drops. In addition, the useful empirical correlation for thermal efficiency is obtained in the current study. Thermal efficiency is expressed in terms of non-dimensional time, sphere diameter, porosity, and pressure drops. It is also found that the pressure drop through the cylinder becomes larger as the gas temperature does higher at the inlet region, whereas it substantially decreases when the inlet flow rate decreases.
Keywords
Porous medium; Thermal efficiency; Ergun equation; Pressure drop;
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