Abstract
In this paper, the heat transfer of pin-fin plate unit (PFPU) under static and oscillating conditions are numerically studied using the discrete element method (DEM). The flow and heat transfer characteristics of the PFPU with sinusoidal oscillation are investigated under the conditions of oscillating frequency of 0–10 Hz, amplitude of 0–5 mm and oscillating direction of Y and Z. The contact number, contact time, porosity and heat transfer coefficient under the above conditions are analyzed and compared with the smooth plate. The results show that the particle far away from the plate can transfer heat with the pin-fin of PFPU, and the oscillating PFPU can significantly increase the contact number and enhance the temperature diffusion and heat transfer. The heat transfer coefficient of PFPU increases with the increase of oscillating frequency and amplitude. When the PFPU oscillates along the Y direction with the amplitude of 1 mm and the frequency of 10 Hz, the heat transfer coefficient of PFPU is increased by 28% compared with that of the smooth plate. Compared with the oscillation along the Z direction, the oscillation along the Y direction has a significant enhancement on the heat transfer of PFPU.
Highlights
For the heat exchange of high-temperature granular matter, moving bed heat exchangers (MBHE) with low cost, clean energy and wide granularity adaptability are gradually applied to industrial waste heat recovery [6]
Effect of Pin-Fin and Oscillation exchange surface of Case 4 is the pin-fin plate unit (PFPU) oscillating in the Y direction
When the PFPU oscillates along the Y direction and the amplitude is 1.25 D (Case 9), the heat transfer coefficient of the particles flow around the PFPU increases by 50% compared with that of the particle flow around the plate (Case 1)
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. High-temperature granular matter is widely present in industrial production and energy conversion process; for example, high-temperature particles of more than 1000 K can be produced in the production of cement, lime, coke oven coke, etc. Granular matter is gradually applied in concentrating solar power [2] and energy storage system [3]. As compared with gas or molten salt [4], granular matter has higher specific heat capacity and higher working temperature [5]. For the heat exchange of high-temperature granular matter, moving bed heat exchangers (MBHE) with low cost, clean energy and wide granularity adaptability are gradually applied to industrial waste heat recovery [6]
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