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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

The Contact Heat Transfer in Rotary Drums in Dependence on the Particle Size Ratio

Get access (open in a dialog) DOI: 10.1615/IHTC15.mfp.008844
pages 4689-4699

Аннотация

An experimental study of the heat transfer from the inner drum wall to the covered surface of the solid bed has been done in an indirectly heated rotary drum with a diameter of D = 0.6 m and a length of L = 0.45 m. Temperature of the , the drum wall and the solid bed were measured using 16 k-type thermocouples assembled on both a rotating and a fixed rod that attached inside the drum. Hence, the radial and circumferential temperature profiles were measured, and the contact heat transfer coefficients were calculated from these temperature profiles. Experiments have been carried out using monodisperse and bidisperse solids beds with different particle size ratios to see the effect on the contact heat transfer coefficient. Two different materials, glass beads and steel spheres, have been used in these experiments. These materials differ greatly in their thermo physical properties (density, heat capacity and thermal conductivity). The operating parameters, rotational speed and filling degree, are varied in the range n = 1…6 rpm and F = 10…20% to see their influence on the contact heat transfer coefficient in addition to the particle size ratio and thermo physical properties.