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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

FLOW AND HEAT TRANSFER CHARACTERISTICS OF SUPERCRITICAL HYDROCARBON FUEL IN MINI-CHANNEL WITH MICRO-RIBS

Get access (open in a dialog) DOI: 10.1615/IHTC16.hte.022492
pages 5233-5241

Sinopsis

The heat transfer enhancement of mini-channel in supercritical conditions is one of the most important issues in aerospace. In this paper a 3D numerical model of mini-channel full of supercritical hydrocarbon with micro-ribs is built. SST k-ω turbulent model is applied for capturing flow characteristics. The flow and heat transfer characteristics of smooth cooling channel and cooling channel with micro-ribs are compared. Different micro-rib dimensions defined as h/e and p/e are studied to assess their influence on convection heat transfer. The results show that micro-ribs can prominently enhance the heat transfer in the cooling channel and reduce local heat transfer deterioration while the channel pressure loss is limited. It's also found that the micro-rib dimensions have quite differently nonmonotonic effect on the heat transfer of supercritical hydrocarbon fuel compared with under-critical conditions. It can be concluded that there exists an optimal rib size for specific thermal conditions and cooling demands and. In this study, the optimum rib size is: e=0.3mm, h=0.144mm, p=3mm, where h/e=0.48, p/e=10.