Numerical investigation on heat and mass transfer characteristics of ice slurry in pulsating flow. (15th June 2022)

• Record Type: Journal Article
• Authors: Cai, Lingling; Mi, Sha; Luo, Chun; Liu, Zhiqiang
• Is Part Of: International journal of heat and mass transfer. Volume 189(2022)
• Publication Date: 2022-06-15
• Subjects: Ice slurry -- Computational fluid dynamics -- Pulsating flow -- Heat transfer enhancement -- Phase change; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2022.122722
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: The effect of pulsating flow on heat transfer efficiency of ice slurry is studied. The cycle-averaged heat transfer coefficient can be increased by 34%. Heat transfer is more efficient for large particles and high ice volume fraction. The prediction correlation for the time-averaged nusselt number is proposed. Abstract: In this paper, the heat transfer enhancement of ice slurry in a horizontal pipe with constant heat flux has been investigated numerically. The model is validated with the experimental results from the literature. Then the axial distribution of the heat transfer coefficient, the bulk and wall temperature and the ice volume fraction are obtained. The factors that affect the heat transfer coefficient are analyzed. Furthermore, the heat transfer efficiency of ice slurry in pulsating flow is compared with that in steady state. It is found that the heat transfer efficiency of ice slurry can be significantly improved by pulsating flow. The maximum increment of cycle-averaged heat transfer coefficient reaches 34.32%. Moreover, the degrees of heat transfer enhancement increase with increasing pulsating frequency, relative amplitude of velocity, ice particle diameter and ice volume fraction, and decrease with increasing cycle-averaged velocity. And the heat transfer is more efficient to ice slurry with large particles and ice volume fraction under the pulsating flow conditions. The pulsating frequency is suggested to be not more than 10π Hz. Finally, the correlation for predicting cycle-averaged Nusselt number of ice slurry in pulsating flow is established, and obtaining the reasonably good prediction results.