{"title":"超临界水的物理性质对粒子团内单个粒子传热特性的影响","authors":"Xiaoyu Li, Bowei Zhang, Huibo Wang, Hui Jin","doi":"10.1016/j.partic.2024.04.002","DOIUrl":null,"url":null,"abstract":"<div><p>The complex physical properties of supercritical water (SCW) make the heat transfer characteristics of particles within a particle cluster complicated. The heat transfer characteristics of single particle within a particle cluster in SCW, influenced by surrounding particles, have not been effectively explored. The numerical simulations were conducted to investigate the heat transfer characteristics of particle clusters in SCW under different conditions. The results were compared and analyzed with those from constant property flow. It was found that Reynolds number (<em>Re</em>) and the void fraction of particle cluster have no special effects on the variation trends of Nusselt number (<em>Nu</em>) for the focused particle. However, the particle temperature had a significant effect on the variation trends of <em>Nu</em>. The effect of <em>Re</em> on the heat transfer rate exponent (<em>η</em>) of the focused particle can be divided into two zones: a significant effect zone and a non-significant effect zone. The effect of void fraction on <em>η</em> in the non-significant effect zone was minimal. Within the non-significant effect zone, <em>η</em> decreased with the increasing particle temperature. In the significant effect zone, the variation trends of <em>η</em> became more complex. The fundamental reason for this series of phenomena is the changes in distribution of physical properties. A model for <em>η</em> was developed for the non-significant effect zone. This model can filter out the effects of <em>Re</em> and certain particle cluster spatial configurations, and it demonstrates good predictive performance.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":null,"pages":null},"PeriodicalIF":4.1000,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of physical properties of supercritical water on heat transfer characteristics of single particle within a particle cluster\",\"authors\":\"Xiaoyu Li, Bowei Zhang, Huibo Wang, Hui Jin\",\"doi\":\"10.1016/j.partic.2024.04.002\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The complex physical properties of supercritical water (SCW) make the heat transfer characteristics of particles within a particle cluster complicated. The heat transfer characteristics of single particle within a particle cluster in SCW, influenced by surrounding particles, have not been effectively explored. The numerical simulations were conducted to investigate the heat transfer characteristics of particle clusters in SCW under different conditions. The results were compared and analyzed with those from constant property flow. It was found that Reynolds number (<em>Re</em>) and the void fraction of particle cluster have no special effects on the variation trends of Nusselt number (<em>Nu</em>) for the focused particle. However, the particle temperature had a significant effect on the variation trends of <em>Nu</em>. The effect of <em>Re</em> on the heat transfer rate exponent (<em>η</em>) of the focused particle can be divided into two zones: a significant effect zone and a non-significant effect zone. The effect of void fraction on <em>η</em> in the non-significant effect zone was minimal. Within the non-significant effect zone, <em>η</em> decreased with the increasing particle temperature. In the significant effect zone, the variation trends of <em>η</em> became more complex. The fundamental reason for this series of phenomena is the changes in distribution of physical properties. A model for <em>η</em> was developed for the non-significant effect zone. This model can filter out the effects of <em>Re</em> and certain particle cluster spatial configurations, and it demonstrates good predictive performance.</p></div>\",\"PeriodicalId\":401,\"journal\":{\"name\":\"Particuology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.1000,\"publicationDate\":\"2024-04-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Particuology\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1674200124000567\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Particuology","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1674200124000567","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Effects of physical properties of supercritical water on heat transfer characteristics of single particle within a particle cluster
The complex physical properties of supercritical water (SCW) make the heat transfer characteristics of particles within a particle cluster complicated. The heat transfer characteristics of single particle within a particle cluster in SCW, influenced by surrounding particles, have not been effectively explored. The numerical simulations were conducted to investigate the heat transfer characteristics of particle clusters in SCW under different conditions. The results were compared and analyzed with those from constant property flow. It was found that Reynolds number (Re) and the void fraction of particle cluster have no special effects on the variation trends of Nusselt number (Nu) for the focused particle. However, the particle temperature had a significant effect on the variation trends of Nu. The effect of Re on the heat transfer rate exponent (η) of the focused particle can be divided into two zones: a significant effect zone and a non-significant effect zone. The effect of void fraction on η in the non-significant effect zone was minimal. Within the non-significant effect zone, η decreased with the increasing particle temperature. In the significant effect zone, the variation trends of η became more complex. The fundamental reason for this series of phenomena is the changes in distribution of physical properties. A model for η was developed for the non-significant effect zone. This model can filter out the effects of Re and certain particle cluster spatial configurations, and it demonstrates good predictive performance.
期刊介绍:
The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles.
Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors.
Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology.
Key topics concerning the creation and processing of particulates include:
-Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales
-Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes
-Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc.
-Experimental and computational methods for visualization and analysis of particulate system.
These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.