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低温海水外掠圆管混合对流传热规律实验
林日亿1,2,李晓辰3,梁金国1,徐伟栋1,郭彬1
(1.中国石油大学(华东)储运与建筑工程学院,山东青岛 266580;2.山东省油气储运安全省级重点实验室,山东青岛 266580;3.山东力诺瑞特新能源有限公司,山东济南 250000)
摘要:
以自然海水为工质,对层流范围内低温海水的混合对流传热特性进行实验研究,研究换热特性与雷诺数、格拉晓夫数和管径的关系,并与经验公式进行对比;提出适用于层流范围内低温海水外掠圆管流动与换热系数的经验公式。结果表明,在实验范围内努赛尔数随着雷诺数和格拉晓夫数增大而增大,且雷诺数越小,格拉晓夫数对努赛尔数的影响越明显;努赛尔数随着立管直径增大逐渐减小,小管径有利于增强对流传热强度;自然对流的影响随着雷诺数增加而减小,随着格拉晓夫数增大而增大;立管直径越大,自然对流对于总换热量的影响越强,且雷诺数越小,管径变化对自然对流在总换热量中的影响越明显。
关键词:  石油  传热  流动  低温海水  混合对流传热  实验
DOI:10.3969/j.issn.1673-5005.2018.06.015
分类号::TE 53
文献标识码:A
基金项目:国家自然科学基金面上项目(51874333);山东省自然科学基金项目(ZR2017MEE030);国家“十三五”科技重大专项(2016ZX05012-002-005);中央高校基本科研业务费专项(15CX05002A)
Mixed convective heat transfer experiment of hypothermic seawater flow across a pipe
LIN Riyi1,2, LI Xiaochen3, LIANG Jinguo1, XU Weidong1, GUO Bin1
(1.College of Pipeline & Civil Engineering in China University of Petroleum(East China),Qingdao 266580, China;2.Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao 266580, China;3.Shandong Linuo Paradigma Company Limited, Jinan 250000, China)
Abstract:
The mixed convective heat transfer characteristics of natural seawater in the laminar flow region were studied. And the relationship between the heat transfer characteristics and Reynolds number, Grash of number and diameter was explored. Finally the experimental results were compared with the empirical formulas. The empirical formula on the mixed convective heat transfer coefficient is proposed, which is applicable to the laminar flow of the hypothermic seawater flow across the pipe.The results show that Nu increases with the increase of Re and Gr. With the decrease of Re, the influence of Gr on Nu is more obvious. Nu decreases with the increase of the diameter, the small diameter tube is beneficial to enhance the convective heat transfer intensity. The influence of natural convection decreases with the increase of Re, and increases with the increase of Gr. The influence of natural convection is stronger with the increase of tube diameter, and with the decrease of Re the influence of diameter on the natural convection is more obvious.
Key words:  petroleum  heat conduction  flow  hypothermic seawater  mixed convection heat transfer  experiment
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