Heat and Mass Transfer最新文献_第6页

Performance prediction and evaluation of heat pipe with hexagonal perforated twisted tape inserts 带有六角形穿孔扭曲带插入件的热管的性能预测和评估

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-03-20 DOI: 10.1007/s00231-024-03469-w

Snehal Vasant Kadbhane, Dilip R. Pangavhane

{"title":"Performance prediction and evaluation of heat pipe with hexagonal perforated twisted tape inserts","authors":"Snehal Vasant Kadbhane, Dilip R. Pangavhane","doi":"10.1007/s00231-024-03469-w","DOIUrl":"https://doi.org/10.1007/s00231-024-03469-w","url":null,"abstract":"Efficient heat transfer technologies are critical in a wide range of industrial applications, including air conditioning, chemical reactors, and heat exchangers. One method for improving heat transfer performance is to use twisted tape inserts in heat exchanger tubes. Heat transmission is aided by the disturbance of fluid flow caused by these inserts, although research is still ongoing to establish the specific design components that maximize their efficacy. The research focuses on heat transfer optimization in practical applications by exploring hexagonal perforated twisted tape inserts with varied cut orientations (horizontal, vertical, and alternate) and a pitch ratio of 4. The problem becomes more complex without a complete numerical prediction model. The study seeks to construct a hybrid deep neural network based on a gannet optimization algorithm (DNN-GOA) model in order to estimate heat transfer performance accurately. According to the experimental results, the TTA’s specific design with alternate cuts produces a thinner thermal boundary layer and a higher convective heat transfer coefficient for Nusselt number (Nu), friction factor (f), and thermal performance factor (TPF). The Hybrid DNN-GOA model has the best predictive performance, with a high R2 indicating a tight match between anticipated and real Nu, f, and TPF values. It also exhibits the lowest Root Mean Square Error (RMSE), Mean Absolute Error (MAE), Mean Absolute Percentage Error (MAPE), and Mean Squared Error (MSE), confirming its exceptional accuracy.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to: Thermo‑physical characterizations and simulation study of an energy‑efficient building material: clay stabilized by wood ashes or crushed waste from traditional pottery 更正：节能建筑材料的热物理特性和模拟研究：使用木灰或传统陶器碎屑稳定的粘土

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-03-14 DOI: 10.1007/s00231-024-03466-z

Said Bajji, Younes Bahammou, Yassir Bellaziz, Ahmed Saba, Youssef Naimi

引用次数: 0

Exploring thermal dynamics of polyaniline-modified paraffin wax phase change material with varied PANI loadings (1–4% wt.) 探索不同 PANI 含量（1-4% wt.）

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-03-11 DOI: 10.1007/s00231-024-03454-3

{"title":"Exploring thermal dynamics of polyaniline-modified paraffin wax phase change material with varied PANI loadings (1–4% wt.)","authors":"","doi":"10.1007/s00231-024-03454-3","DOIUrl":"https://doi.org/10.1007/s00231-024-03454-3","url":null,"abstract":"<h3>Abstract</h3> In this experimental study, we explore the potential enhancements in thermal conductivity while investigating alterations in latent heat and phase change temperature within Composite Phase Change Materials (PCMs). These composites consist of Paraffin Wax (PW) as the base material, incorporating dispersed conducting Polyaniline (PANI) powder in varying concentrations ranging from 1% wt. to 4% wt. The mass fractions of PANI added to PW include 1%, 2%, 3%, and 4%, and the composite PCMs are meticulously prepared through ultrasonication. Examining the surface morphology of Composite Phase Change Materials (PCMs) involved utilizing a Scanning Electron Microscope (SEM), while the determination of thermal conductivity employed a Heat Flow Meter. Additionally, latent heat and phase change temperatures were assessed through Differential Scanning Calorimetry (DSC). The obtained results indicate an augmentation in the thermal conductivity of the composites when compared to Paraffin Wax (PW). Specifically, thermal conductivity exhibited a 40% increase for 1% wt. of PANI, yet experienced a subsequent decline for the remaining weight percentages. Furthermore, the latent heat and phase change temperatures of the composites were observed to decrease in comparison to PW. These composite PCMs with enhanced thermal conductivity, achieved through the incorporation of Polyaniline in Paraffin Wax, are highly potential for several applications in energy storage systems, thermal regulation devices, and heat management technologies.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140097748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Conjoint effect of turbulator and Al2O3 nanofluids on DPHEs thermal performance: Experimental study 涡轮和 Al2O3 纳米流体对 DPHE 热性能的共同影响：实验研究

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-03-08 DOI: 10.1007/s00231-024-03460-5

Shankara Murthy H M, Ramakrishna N. Hegde, Niranjana Rai

{"title":"Conjoint effect of turbulator and Al2O3 nanofluids on DPHEs thermal performance: Experimental study","authors":"Shankara Murthy H M, Ramakrishna N. Hegde, Niranjana Rai","doi":"10.1007/s00231-024-03460-5","DOIUrl":"https://doi.org/10.1007/s00231-024-03460-5","url":null,"abstract":"The energy crisis we are currently experiencing is merely the start of a very challenging and wide transformation. The sectors of power, coal, and natural gas encountered the biggest vibrations. To help with energy conservation, a compact and effective heat exchanger was made available that may be utilized to collect waste heat from power plants and industries. This study investigates the effects of combining passive techniques on the performance of a double-pipe heat exchanger equipped with a metal turbulator on the hot side and Al2O3 nanofluid on the cold side. The experiments used different volume fractions of Al2O3 nanofluid (Vol.%: 0.05, 0.1, and 0.15) as cold fluid with varying flow rates (500 ≤ Re ≤ 5000) in the annulus, as well as variously configured twisted tapes (Twist ratio: 20, 13.3, and 9.8) and frequently spaced helical screw tapes (Number of helices: 5, 7 and 9). The results show that the Nusselt number increases by 11.11% and the thermal performance factor increases by 1.116 times in case of twisted tapes with twist ratio 20 and 0.05% nanofluid combination, and by 24.93% and 1.269 times in case of frequently spaced helical screw tape with 9 number of helices and 0.15% nanofluid combination, respectively. Therefore, even at the expense of a small amount of pressure loss, 9 helices with 0.15% of Al2O3 nanofluid offered better performance in the combinations evaluated.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of a novel solar-driven internally cooled liquid desiccant system for hot and humid climates 针对湿热气候的新型太阳能驱动内部冷却液体干燥剂系统研究

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-03-08 DOI: 10.1007/s00231-024-03462-3

{"title":"Study of a novel solar-driven internally cooled liquid desiccant system for hot and humid climates","authors":"","doi":"10.1007/s00231-024-03462-3","DOIUrl":"https://doi.org/10.1007/s00231-024-03462-3","url":null,"abstract":"<h3>Abstract</h3> The current paper experimentally studied the performance of solar-driven internally cooled liquid desiccant system for hot and humid climates using CaCl2 as a liquid desiccant. The system is designed to investigate the input conditions of the room by adjusting various air and solution variables. This internally cooled liquid desiccant system consists of the dehumidifier and regenerator in a single module and the regeneration of the solution is done by solar energy. The present study analyzes the effect of solution concentration, air mass flow rate and solution volume flow rate using different performance indices such as humidity reduction, moisture effectiveness, enthalpy effectiveness, and COP. The results demonstrate that the maximum moisture reduction of 4.2 g/kg d.a. is found at an airflow rate of 0.03195 kg/s, a solution volume flow rate of 12.5 LPM, and a solution concentration of 37%, while the maximum COP of 0.274 is obtained at an airflow rate of 0.0715 kg/s, a solution volume flow rate of 12.5 LPM, and a solution concentration of 37%. The maximum moisture and enthalpy effectiveness are obtained as 24.1% and 26.2%, respectively. The paper also presents the correlations for moisture and enthalpy effectiveness based on findings from experiments.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical and experimental research on natural convection condensation heat transfer 自然对流冷凝传热的数值和实验研究

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-03-04 DOI: 10.1007/s00231-024-03468-x

Bing Tan, Jiejin Cai

{"title":"Numerical and experimental research on natural convection condensation heat transfer","authors":"Bing Tan, Jiejin Cai","doi":"10.1007/s00231-024-03468-x","DOIUrl":"https://doi.org/10.1007/s00231-024-03468-x","url":null,"abstract":"Natural convection condensation, with the advantage of high reliability and not requiring complex mechanical drive structures, is broadly used in industrial fields, such as chemical, nuclear power, automotive, etc. This work aims to investigate the heat transfer mechanism and evaluate the performance of natural convection condensation with the artificial neural network (ANN) method, correlation predictions, and the code based on the boundary theory. An empirical correlation was proposed based on the present experimental data with operating conditions in the pressure range of 0.2 MPa -0.6 MPa, subcooled temperature range of 11 K–45 K, and air mass fraction range of 0.0049–0.69. The empirical correlation was validated against a consolidated database, with 91% of the data reproduction falling within the error band of (pm) 30%. An ANN model was put forward with training, validation, and testing using the present experimental data, which yields an error of (pm) 5% in the present test data. When the trained model was utilized to reproduce the additional database, all the data fell within an (pm) 11% error band. Finally, a side-by-side comparison in heat transfer coefficient reproduction was conducted among those rapidly computational methods, and the ANN model turned out to have the best performance.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140026169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study of multidimensional wire-plate/sintered hybrid mini heat pipes for electronics 用于电子产品的多维线板/烧结混合微型热管的实验研究

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-03-02 DOI: 10.1007/s00231-024-03467-y

Marcia B. H. Mantelli, João V. C. Batista, Juan P. F. Mera

{"title":"Experimental study of multidimensional wire-plate/sintered hybrid mini heat pipes for electronics","authors":"Marcia B. H. Mantelli, João V. C. Batista, Juan P. F. Mera","doi":"10.1007/s00231-024-03467-y","DOIUrl":"https://doi.org/10.1007/s00231-024-03467-y","url":null,"abstract":"The experimental study concerning new two and three dimensional mini heat pipes, proposed for cooling electronic components in printed circuit boards is presented. These heat pipes can capture the heat from electronic components and conduct it to the cabinet wall, through the narrow spaces available between boards. As the location and dissipation of the electronic components vary, several different heat pipes are necessary for a complex electronic equipment, which should operate at different temperatures and orientations. A hybrid wick structure, composed by sintered copper powder and wire-plate technologies along the device are proposed. Four different types of hybrid mini heat pipes, in up to three generations, were designed and constructed, using diffusion bonding fabrication technique. Two different testing setups were developed. First, the thermal performance of the hybrid heat pipes was accessed, resulting in the selection of the appropriated working fluid and its volume. Second, the devices were tested in rigs that mimic actual electronic equipment geometries and operational conditions. The several hybrid multidimensional heat types worked well, even against gravity. Besides, the present work shows that the wire-plate wick structure, up to this date considered only in academic studies, resulted in very flexible heat pipes, able to start up easily, in several adverse geometric and gravitational conditions, especially when combined with more conventional technologies, such as sintered porous media. Besides, the fabrication process developed that includes diffusion bonding, can be considered a novelty.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140018865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of a phase change numerical model to the simulation of freezing and thawing of wrapped foods 应用相变数值模型模拟包装食品的冷冻和解冻过程

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-03-01 DOI: 10.1007/s00231-024-03452-5

Beata Anwajler, Daniel Smykowski, Jacek Kasperski

引用次数: 0

Heat transfer on impingement cooled meshing spur gears: Experimental comparison of into-mesh, out-of-mesh and inclined impingement methods 冲击冷却啮合正齿轮的传热：啮入法、啮出法和倾斜撞击法的实验比较

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-02-29 DOI: 10.1007/s00231-024-03464-1

Emre Ayan, Christian Kromer, Corina Schwitzke, Hans-Jörg Bauer

引用次数: 0

Comparison of thermal conductivities of polypropylene fibers and fibrils 聚丙烯纤维和纤维的导热性比较

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-02-26 DOI: 10.1007/s00231-024-03463-2

Hao Yin, Chenhan Liu, Bin Wang, Yong Li, Xue Hu, Junyao Yin, Jinbo Liu, Gutian Zhao, Juekuan Yang

引用次数: 0