Convective heat transfer coefficient for a rod-like particle in a uniform flow. (February 2020)

• Record Type: Journal Article
• Authors: Ma, Huaqing; Zhao, Yongzhi
• Is Part Of: International journal of heat and mass transfer. Volume 147(2020)
• Publication Date: 2020-02
• Subjects: Rod-like particle -- Convective heat transfer -- Nusselt number -- LBM (Lattice Boltzmann Method) -- IBM (Immersed Boundary Method) -- DEM (Discrete Element Method); Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2019.118742
• Languages: English
• ISSNs: 0017-9310

Abstract

Graphical abstract: Highlights: The cold flow over a hot stationary rod-like particle is simulated by IBM-LBM. Particle aspect ratio ( AR ) and orientation ( α ) has little effect on Nu for low Re . The variations of Nu with AR and α are different for intermediate and high Re . A Nusselt number correlation for rod-like particles is proposed. Abstract: Rod-like particles are widely encountered in the industry, e.g., the biomass utilization, and it always involves the heat transfer in a forced flow. However, works about the convective heat transfer, i.e., the Nusselt number, for rod-like particles are rare. Motivated by this fact, this work is therefore devoted to investigating the heat transfer behaviors of rod-like particles in a forced flow and to developing a Nusselt number relation. To do so, a hot stationary rod-like particle that is passed by the cold continuous fluid flows is simulated by three-dimensional IBM-LBM (Immersed Boundary Method – Lattice Boltzmann Method). Abundant results have been obtained and are available for elucidating the influences of pertinent parameters, including the Reynolds number ( Re ), particle aspect ratio ( AR ) and particle orientation ( α ), in the range of parameters: 1 ≤ Re ≤ 1500, 1 ≤ AR ≤ 5 and 0° ≤ α ≤ 90°. The simulation results indicate that changing the Reynolds number, particle aspect ratio and orientation will significantly affect the heat transfer between the fluid phase and rod-like particle. Moreover, how the particle shape and orientation impact the heat transfer is concerned with the Reynolds number. At last, based on the obtained data, a correlation for averaged Nusselt number that considers the effects of Re, AR and α is proposed. This correlation holds promising prediction accuracy and can be enclosed in the multiphase modeling, e.g., the Eulerian-Lagrangian coupling calculation, involving the convective heat transfer of rod-like particles.