Number：

01099018

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Name：

Sheng-Chung Tzeng

Titles：

professor

Author：

Tzer-Ming Jeng , Sheng-Chung Tzeng , Yi-Chen Chen

Paper name：

Thermal Characteristics in Asymmetrically Heated Channels Fully Filled with Brass Beads

Name of activity：

International Journal of Thermal Sciences(SCI)

Keywords：

Abstract：

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=l.67-15), and the Reynolds number (Re_D = 755-7921 and Re_dp=38-2703). The results indicated that the bead diameter (d), rather than the hydraulic diameter (D_h), may be a proper parameter to generalize the data for heat transfer in a packed channel. The particle Nusselt number (Nu_dp) increased witi 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 Nu_dp,x) for various L/d, H/d and Re_dp were provided.

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