Effect of particle loading on heat transfer enhancement in a gas-solid suspension cross flow |
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| Authors: | Zhou Jin-song Luo Zhong-yang Gao Xiang Ni Ming-jiang Cen Ke-fa |
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| Institution: | (1) Clean Energy and Environment Engineering Key Lab of Ministry of Education Institute for Thermal Power Engineering, Zhejiang University, 310027 Hangzhou, China |
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| Abstract: | Heat transfer between gas-solid multiphase flow and tubes occurs in many industry processes, such as circulating fluidized
bed process, pneumatic conveying process, chemical process, drying process, etc. This paper focuses on the influence of the
presence of particles on the heat transfer between a tube and gas-solid suspension. The presence of particles causes positive
enhancement of heat transfer in the case of high solid loading ratio, but heat transfer reduction has been found for in the
case of very low solid loading ratio (M
s of less than 0.05 kg/kg). A useful correlation incorporating solid loading ratio, particle size and flow Reynolds number
was derived from experimental data. In addition, thek-∈ two-equation model and the Fluctuation-Spectrum-Random-Trajectory Model (FSRT Model) are used to simulate the flow field
and heat transfer of the gasphase and the solid-phase, respectively. Through coupling of the two phases the model can predict
the local and total heat transfer characteristics of tube in gas-solid cross flow. For the total heat transfer enhancement
due to particles loading the model predictions agreed well with experimental data.
Project supported by National Natural Science Foundation for Distinguished Young Scholars (No. 50025618) |
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| Keywords: | Multiphase flow Heat transfer Particle loading |
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