Experimental and Numerical Analysis of Particle Flow and Heat Transfer Characteristics Between Flat Plates
Based on a vertical structure of a plate shell moving packed bed solar particle heat exchanger,the heat transfer characteristics between particles and different plate wall surfaces were experimentally studied in this paper.The discrete element model was used to simulate the flow trajectory and state of particles inside the plate in three-dimensional,and the influence mechanism of different wall shapes on the heat transfer process was analyzed.The results indicate that compared with ordinary smooth copper plates,wavy plates significantly weaken overall heat transfer,rough plates also weaken heat transfer at high flow rates(25～54 g·s-1).Although the corrugated plate weakens heat transfer at low flow rates(6～25 g·s-1),it can achieve heat transfer enhancement at high flow rates(26～54 g·s-1).Further numerical analysis shows that although wave plates,corrugated plates,and rough plates all enhance particle disturbance,they also extend the falling time of particles.When the degree of heat transfer enhancement caused by enhanced disturbance is greater than the degree of heat transfer weakening caused by increased falling time,the overall heat transfer process exhibits a strengthening effect,and conversely,a weakening effect occurs.
plate shell particle heat exchangerdiscrete element methodmicro heat transfer mechanism
NETL
NSTL
万方数据
