کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
669158 | 1458774 | 2011 | 8 صفحه PDF | دانلود رایگان |
This study experimentally investigated the heat transfer characteristics in the asymmetrically heated rectangular channels fully filled with porous materials. Air was used as the coolant. The porous materials were packed by brass beads with average diameters (d) of 2, 4 and 6 mm. The channel width (W) was fixed to be 60 mm. Variable parameters were the relative length of packed channel (L/d = 5–60), the relative height of packed channel (H/d = 1.67–15), and the Reynolds number (ReD = 755–7921 and Redp = 38–2703). The results indicated that the bead diameter (d), rather than the hydraulic diameter (Dh), may be a proper parameter to generalize the data for heat transfer in a packed channel. The particle Nusselt number (Nu¯dp) increased with decreasing L/d, while the H/d was not sensitive to Nu¯dp. Finally, the correlations of average and local particle Nusselt numbers (Nu¯dp and Nudp,x) for various L/d, H/d and Redp were provided.
Journal: International Journal of Thermal Sciences - Volume 50, Issue 10, October 2011, Pages 1853–1860