Abstract
An elliptical-like combined tube (ELCT) is proposed for the shell-and-tube moving packed bed heat exchanger. The heat transfer of particle flow around the ELCT is numerical studied. The kinetic energy ratio, contact number, contact time and heat transfer coefficient are analyzed. It is found that, the heat transfer performance of the ELCT is similar to that of the elliptical tube (ET) and better than the circular tube (CT). Compared with the CT, the ELCT significantly reduces the stagnation zone and the cavity zone, and improves the heat transfer at the top and the bottom of the tube (average increase of 42% and 53%). Furthermore, compared with the ET and the CT, the ELCT has better inside-tube heat transfer performance (average increase of 5% and 29%), various inside-tube heat transfer enhancement techniques (same with the CT) and better flexural capacity (average increase of 8% and 36% under same mass).
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