Research on heat transfer and flow characteristics of cubic fillers

doi:10.19799/j.cnki.2095-4239.2022.0673

Abstract

Abstract:

The structure of the filling material in the packed bed has an important impact on the flow and heat storage and release performance in the packed bed. In this study, a kind of packing material with cube cell structure is designed, which can be stacked orderly and stably, making the fluid flow and heat transfer in the packed bed more uniform. Through numerical simulation, the planned cube cell's heat transfer and flow characteristics were examined. The convective heat transfer and pressure loss in the cube cell under different mass flow rates were examined. The outcomes were contrasted and examined using both the conventional spherical simple cubic packing structure (SC) and the body-centered cubic packing structure (BCC). The results demonstrate that when the mass flow rate is less than 0.0018 kg/s, the heat transfer coefficient of the cube cell is slightly lower than BCC, but considerably higher than SC; When the mass flow rate is larger than 0.0018 kg/s, the heat transfer coefficient of the cube cell increases rapidly, which is significantly higher than that of BCC and SC; With the increase of mass flow rate, its heat storage/release rate is gradually higher than that of BCC and SC. Fluid in the cubic cell experiences pressure drops that are always between SC and BCC, but they rise quickly when the fluid mass flow rate rises. By examining the comprehensive heat transfer performance, it is discovered that the comprehensive heat transfer performance of cube unit is obviously better than that of BCC, and its comprehensive heat transfer performance is the best when the mass flow rate is less than 0.0018 kg/s. A reference for the filler structure of a neatly packed bed, the entire research demonstrates that the cube cell created in this work has more complete benefits in both heat transfer speed and flow pressure drop.

Key words: packed bed heat storage, filler structure, cube cell, flow characteristics, heat exchange characteristics

CLC Number:

TK 124

Dan LIAO, Zhangmao HU, Wei WANG, Hong TIAN, Yanni XUAN, Donglin CHEN. Research on heat transfer and flow characteristics of cubic fillers[J]. Energy Storage Science and Technology, 2023, 12(3): 676-684.

Figures/Tables 12

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Table 1

Physical parameters of alumina"

密度ρ/(kg/m³)	定压比热容 $C p / [J / (k g · K)]$	导热系数 $λ / [W / (m · K)]$
3707	1300	1.3

Table 1

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