As a special fluid that is different from ordinary fluids, the powder flow severely limits its energy-efficient recovery, which puts forward higher requirements for its energy recovery device. In order to study the heat transfer characteristics of the powder flow, a three-dimensional wall heat transfer experimental device was established, and two media, cement powder and cooling water were used to simulate the energy recovery process environment of the powder flow, and the influence of the particle size, wall spacing, thermal conductivity, bulk density, particle flow rate and three-dimensional pipe structure parameters of the cement powder fluid on the heat transfer coefficient of the efficient three-dimensional pipe energy recovery device was studied, and the heat transfer mechanism between the cement powder flow and the high-efficiency three-dimensional pipe heat exchange element was analyzed. The results show that the total heat transfer coefficient between cement powder particles and three-dimensional pipe wall increases with the increase of particle density and flow rate, and decreases with the increase of cement powder particle size and three-dimensional pipe equivalent diameter. At the same time, it is found that the optimal flow rate of the powder is 3 orders of magnitude different from the ordinary fluid, and the three-dimensional variable space characteristics of the three-dimensional tube can greatly improve the effective mixing of the powder, thereby reducing the impact of the distance between the walls on the heat transfer of the powder. It provides a theoretical design reference for powder flow heat exchangers in practical engineering applications.

powder, energy recovery, three-dimensional tube, heat transfer, micro-vibration.

Received: September 4, 2022; Revised: October 28, 2022; Accepted: November 10, 2022; Published: December 15, 2022

How to cite this article: Mo Xun, Liu Shijie, Tu Aimin, Zhu Dongsheng and Yin Shuangzhi, On micro-vibration heat transfer characteristics of three-dimensional tube applied to powder energy recovery, JP Journal of Heat and Mass Transfer 30 (2022), 45-60. http://dx.doi.org/10.17654/0973576322055

This Open Access Article is Licensed under Creative Commons Attribution 4.0 International License

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