Investigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres

Enhancing heat transfer in the pebble bed reactor could reduce the surface temperatures and lower the possibility of forming hot-spots. The effectiveness of inserting a smaller sphere into a structured pebble bed on optimizing the heat transfer has been confirmed, and yet, the mechanism of heat tran...

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Autores principales:	Chen Leisheng, Zhao Jiahao, Yuan Yuejin, Lee Jaeyoung
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/5b00c5bb61b44712bde820ad24eab40a
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spelling	oai:doaj.org-article:5b00c5bb61b44712bde820ad24eab40a2021-11-12T11:44:34ZInvestigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres2267-124210.1051/e3sconf/202132104001https://doaj.org/article/5b00c5bb61b44712bde820ad24eab40a2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/97/e3sconf_icchmt2021_04001.pdfhttps://doaj.org/toc/2267-1242Enhancing heat transfer in the pebble bed reactor could reduce the surface temperatures and lower the possibility of forming hot-spots. The effectiveness of inserting a smaller sphere into a structured pebble bed on optimizing the heat transfer has been confirmed, and yet, the mechanism of heat transfer enhancement is still not fully understood. The impact of the quantity and size of the small spheres on the heat transfer characteristics has been investigated in this study and the mechanism of enhancement was analyzed. It was found that: (1) When the volume or the surface area of the inserted sphere was kept the same, the overall heat transfer coefficients (HTC) of the pebble bed in case 2 or case 3 respectively demonstrated 1.4% or 2.8% higher than that of the bed in case 1; (2) the overall HTC showed an increasing trend with the decreasing ratio of the surface area to the volume; (3) the varying trends of local HTCs along the designated direction were similar among 3 cases and the strongest heat transfer positions were found near pebble-sphere contact points. Such findings will help to design a better pebble bed core.Chen LeishengZhao JiahaoYuan YuejinLee JaeyoungEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 321, p 04001 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Chen Leisheng Zhao Jiahao Yuan Yuejin Lee Jaeyoung Investigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres
description	Enhancing heat transfer in the pebble bed reactor could reduce the surface temperatures and lower the possibility of forming hot-spots. The effectiveness of inserting a smaller sphere into a structured pebble bed on optimizing the heat transfer has been confirmed, and yet, the mechanism of heat transfer enhancement is still not fully understood. The impact of the quantity and size of the small spheres on the heat transfer characteristics has been investigated in this study and the mechanism of enhancement was analyzed. It was found that: (1) When the volume or the surface area of the inserted sphere was kept the same, the overall heat transfer coefficients (HTC) of the pebble bed in case 2 or case 3 respectively demonstrated 1.4% or 2.8% higher than that of the bed in case 1; (2) the overall HTC showed an increasing trend with the decreasing ratio of the surface area to the volume; (3) the varying trends of local HTCs along the designated direction were similar among 3 cases and the strongest heat transfer positions were found near pebble-sphere contact points. Such findings will help to design a better pebble bed core.
format	article
author	Chen Leisheng Zhao Jiahao Yuan Yuejin Lee Jaeyoung
author_facet	Chen Leisheng Zhao Jiahao Yuan Yuejin Lee Jaeyoung
author_sort	Chen Leisheng
title	Investigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres
title_short	Investigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres
title_full	Investigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres
title_fullStr	Investigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres
title_full_unstemmed	Investigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres
title_sort	investigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/5b00c5bb61b44712bde820ad24eab40a
work_keys_str_mv	AT chenleisheng investigationonthemechanismofenhancingheattransferinapebblebedbyaddinginthenonfixednumberofsmallersizedspheres AT zhaojiahao investigationonthemechanismofenhancingheattransferinapebblebedbyaddinginthenonfixednumberofsmallersizedspheres AT yuanyuejin investigationonthemechanismofenhancingheattransferinapebblebedbyaddinginthenonfixednumberofsmallersizedspheres AT leejaeyoung investigationonthemechanismofenhancingheattransferinapebblebedbyaddinginthenonfixednumberofsmallersizedspheres
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Investigation on the mechanism of enhancing heat transfer in a pebble bed by adding in the non-fixed number of smaller-sized spheres

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