Discrete Element and Continuum Heat Transfer Simulations of a Solar Receiver That Uses Solid Particles As a Heat Transfer Fluid(PPT)

摘要

Conductive heat transfer strongly depends on solids concentration and particle-wall contacts 1. Previous models were derived for packed beds and are inaccurate for flowing particles Heat transfer to flowing particles can be counter-intuitive 2. Higher velocity→ less heat transfer 3. Increased agitation → less heat transfer (sometimes) New model accounts for solids concentration via use of 'particle-wall' distribution function 4. Accurately matches average heat transfer coefficient (average error less than 5% over all test cases) 5. Accurately predicts local heat transfer coefficient Heat transfer is most sensitive to particle size 6. More heat transfer for smaller particles (caveat: no jamming)