SCIENTIA SINICA Technologica最新文献

Analysis methodology of thermal conduction-advection resistance in parallel during heat transfer in the fluid domain 流体域传热过程中热传导与热对流并行阻力的分析方法

SCIENTIA SINICA Technologica Pub Date : 2024-07-01 DOI: 10.1360/sst-2023-0310

Qiuwang Wang, Xiangxuan Li, Ting Wang, Shihong Ma, Bo Zhang, T. Ma

{"title":"Analysis methodology of thermal conduction-advection resistance in parallel during heat transfer in the fluid domain","authors":"Qiuwang Wang, Xiangxuan Li, Ting Wang, Shihong Ma, Bo Zhang, T. Ma","doi":"10.1360/sst-2023-0310","DOIUrl":"https://doi.org/10.1360/sst-2023-0310","url":null,"abstract":"The thermoelectric analogy method and thermal resistance are widely used to solve heat transfer problems to simplify the analysis process of complex heat transfer networks. Traditional thermal resistance is usually applicable to one-dimensional steady-state heat conduction problems. However, heat convection is always involved in engineering applications, such as energy power, petrochemicals, and aerospace. To solve this problem, the concepts of multidimensional thermal conduction-advection parallel resistance analysis in the fluid domain and overall thermal resistance are proposed in this study, and a thermal resistance network is constructed. The area-averaged advection thermal resistance in the fluid domain is closely related to the magnitude and direction of the temperature gradient and velocity. The higher the velocity is, the smaller the area-averaged advection thermal resistance. Simultaneously, “negative thermal resistance” exists in the area-averaged advection thermal resistance, which is equivalent to a “heat source” or “heat sink” in the fluid domain. Results showed that the thermal conduction-advection parallel resistance network plays an important role in the analysis of the flow and heat transfer process and in guiding the regulation and optimization of the heat transfer process.","PeriodicalId":515490,"journal":{"name":"SCIENTIA SINICA Technologica","volume":"45 43","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141690058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bioinspired capillary origami design for minimalist hydrovoltaic power generation 用于极简水力发电的生物启发毛细管折纸设计

SCIENTIA SINICA Technologica Pub Date : 2024-07-01 DOI: 10.1360/sst-2023-0305

Mingqiu Hong, G. Ren, Qichang Hu, WenYuan Ye, J. Ye, ShunGui Zhou

{"title":"Bioinspired capillary origami design for minimalist hydrovoltaic power generation","authors":"Mingqiu Hong, G. Ren, Qichang Hu, WenYuan Ye, J. Ye, ShunGui Zhou","doi":"10.1360/sst-2023-0305","DOIUrl":"https://doi.org/10.1360/sst-2023-0305","url":null,"abstract":"Hydrovoltaics generating sustainable electricity from ubiquitous water available in nature has attracted tremendous interest recently, thus developing a promising source of green energy. Especially, the evaporation-induced electricity stands out because of its stable performance, continuous output and wide application fields. Inspired by the “absorption-transport-evaporation” biological structure of floating leaf aquatic plants, a minimalist hydrovoltaic power generation was proposed using commercial paper, pencil, and natural microbial film as raw materials, and constructed by simple origami, drawing, and film-assembly. Exposing such a centimeter-sized device can produce a maximum voltage of 0.58 V, and a continuous generating electricity for more than 6 days without attenuation. The minimalist hydrovoltaic generator was constructed with a variety of pencil-drawing electrodes and origami capillary structures, can achieve stable and continuous electricity to power commercial electronic devices in the actual environment, with eco-friendly, low-cost, simple, zero carbon emissions, etc. This study provides theoretical guidance and technical support for the commercial application of a portable hydrovoltaic power generator, and has important significance for realizing the goal of “double carbon”.","PeriodicalId":515490,"journal":{"name":"SCIENTIA SINICA Technologica","volume":"4 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141848827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review of the research progress of boundary layer theory 边界层理论研究进展综述

SCIENTIA SINICA Technologica Pub Date : 2024-06-01 DOI: 10.1360/sst-2023-0316

Zhi Tao, Yao Ma, Ruquan You, Haiwang Li

引用次数: 0

Infrared and visible image fusion algorithm based on progressive difference-aware attention 基于渐进式差异感知注意力的红外和可见光图像融合算法

SCIENTIA SINICA Technologica Pub Date : 2024-06-01 DOI: 10.1360/sst-2023-0148

Xu Li, Yu Feng, YongXiang Zhang

引用次数: 0

离散制造系统生产异常管控决策研究进展离散制造系统生产异常管控决策研究进展

SCIENTIA SINICA Technologica Pub Date : 2024-02-01 DOI: 10.1360/sst-2023-0401

Yushan Ma, Yanjun Shi, Shi Ning, Yanmei Li, Yue Ma