Thermo-Fluid Characteristics of High Temperature Molten Salt Flowing in Single-Leaf Type Hollow Paddles | |
Rajeh, Taha; Tu, Ping1; Lin, Hua2; Zhang, Houlei | |
刊名 | ENTROPY |
2018 | |
卷号 | 20期号:8页码:- |
关键词 | Hollow Paddle Molten Salt Thermo-fluid Entropy Generation Rate Trade-off |
ISSN号 | 1099-4300 |
DOI | 10.3390/e20080581 |
英文摘要 | A single-leaf type paddle heat exchanger with molten salt as the working fluid is a proper option in high temperature heating processes of materials. In this paper, based on computational fluid dynamics (CFD) simulations, we present the thermo-fluid characteristics of high temperature molten salt flowing in single-leaf type hollow paddles in the view of both the first law and the second law of thermodynamics. The results show that the heat transfer rate of the hollow paddles is significantly greater than that of solid paddles. The penalty of the heat transfer enhancement is additional pressure drop and larger total irreversibility (i.e., total entropy generation rate). Increasing the volume of the fluid space helps to enhance the heat transfer, but there exists an upper limit. Hollow paddles are more favorable in heat transfer enhancement for designs with a larger height of the paddles, flow rate of molten salt and material-side heat transfer coefficient. The diameter of the flow holes influences the pressure drop strongly, but their position is not important for heat transfer in the studied range. Other measures of modifying the fluid flow and heat transfer like internal baffles, more flow holes or multiple channels for small fluid volume are further discussed. For few baffles, their effects are limited. More flow holes reduce the pressure drop obviously. For the hollow paddles with small fluid volume, it is possible to increase the heat transfer rate with more fluid channels. The trade-off among fluid flow, heat transfer and mechanical strength is necessary. The thermo-fluid characteristics revealed in this paper will provide guidance for practical designs. |
学科主题 | Physics |
语种 | 英语 |
WOS记录号 | WOS:000443250500037 |
内容类型 | 期刊论文 |
源URL | [http://ir.xtbg.org.cn/handle/353005/11107] |
专题 | 西双版纳热带植物园_2012年后新成立研究组 |
作者单位 | 1.Nanjing Univ Sci & Technol, Sch Energy & Power Engn, Nanjing 210094, Jiangsu, Peoples R China 2.Shenzhen Douwin Technol Co Ltd, Shenzhen 518116, Peoples R China 3.Chinese Acad Sci, Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Peoples R China |
推荐引用方式 GB/T 7714 | Rajeh, Taha,Tu, Ping,Lin, Hua,et al. Thermo-Fluid Characteristics of High Temperature Molten Salt Flowing in Single-Leaf Type Hollow Paddles[J]. ENTROPY,2018,20(8):-. |
APA | Rajeh, Taha,Tu, Ping,Lin, Hua,&Zhang, Houlei.(2018).Thermo-Fluid Characteristics of High Temperature Molten Salt Flowing in Single-Leaf Type Hollow Paddles.ENTROPY,20(8),-. |
MLA | Rajeh, Taha,et al."Thermo-Fluid Characteristics of High Temperature Molten Salt Flowing in Single-Leaf Type Hollow Paddles".ENTROPY 20.8(2018):-. |
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