Archives of Thermodynamics最新文献_第3页

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Archives of Thermodynamics Pub Date : 2023-09-13 DOI: 10.24425/ather.2023.147535

引用次数: 0

3D simulation of incompressible flow a rounda rotating turbulator: Effect of rotational and direction speed 圆形旋转紊流器不可压缩流动的三维模拟:旋转速度和方向速度的影响

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Archives of Thermodynamics Pub Date : 2023-08-02 DOI: 10.24425/ather.2023.146562

Elhadi Zoubai, H. Laidoudi, Ismail Tlanbout, D. Makinde

引用次数: 0

Numerical analysis of the heating of a die for the extrusion of aluminium alloy profiles in terms of thermochemical treatment 铝合金型材挤压模具加热的热化学处理数值分析

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Archives of Thermodynamics Pub Date : 2023-08-02 DOI: 10.24425/ather.2023.146563

D. Joachimiak, Wojciech Judt, M. Joachimiak

{"title":"Numerical analysis of the heating of a die for the extrusion of aluminium alloy profiles in terms of thermochemical treatment","authors":"D. Joachimiak, Wojciech Judt, M. Joachimiak","doi":"10.24425/ather.2023.146563","DOIUrl":"https://doi.org/10.24425/ather.2023.146563","url":null,"abstract":"Thermochemical treatment processes are used to produce a surface layer of the workpiece with improved mechanical properties. One of the important parameters during the gas nitriding processes is the temperature of the surface. In thermochemical treatment processes, there is a problem in precisely determining the surface temperature of heat-treated massive components with complex geometries. This paper presents a simulation of the heating process of a die used to extrude aluminium proﬁles. The maximum temperature diﬀer-ences calculated in the die volume, on the surface and at the most mechanically stressed edge during the extrusion of the aluminum proﬁles were analysed. The heating of the die was simulated using commercial transient thermal analysis software. The numerical calculations of the die assumed a boundary condition in the form of the heat transfer coeﬃcient obtained from experimental studies in a thermochemical treatment furnace and the solution of the nonstationary and non-linear inverse problem for the heat conduction equation in the cylinder. The die heating analysis was performed for various heating rates and fan settings. Major diﬀerences in the surface temperature and in the volume of the heated die were obtained. Possible ways to improve the productivity and control of thermochemical treatment processes were identiﬁed. The paper investigates the heating of a die, which is a massive component with complex geometry. This paper indicates a new way to develop methods for the control of thermochemical processing of massive components with complex geometries.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48288847","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

Study of the effect of geometric shape on the quality of mixing: Examining the effect of length of the baffles 几何形状对混合质量影响的研究:考察挡板长度的影响

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Archives of Thermodynamics Pub Date : 2023-08-02 DOI: 10.24425/ather.2023.146559

Malika Seddik Bouchouicha, H. Laidoudi, Souad Hassouni, D. Makinde

引用次数: 1

The influence of thermophysical properties of frozen soil on the temperature of the cast-in-place concrete pile in a negative temperature environment 负温度环境下冻土热物性对现浇混凝土桩温度的影响

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Archives of Thermodynamics Pub Date : 2023-08-02 DOI: 10.24425/ather.2023.146557

Ziying Liu, Tianlai Yu, Ning Yan, Lipeng Gu

{"title":"The influence of thermophysical properties of frozen soil on the temperature of the cast-in-place concrete pile in a negative temperature environment","authors":"Ziying Liu, Tianlai Yu, Ning Yan, Lipeng Gu","doi":"10.24425/ather.2023.146557","DOIUrl":"https://doi.org/10.24425/ather.2023.146557","url":null,"abstract":"Thermophysical properties of frozen soil have a great inﬂu-ence on the quality of cast-in-place concrete piles. In this paper, the embedded concrete temperature monitoring system is used to test the variation law of the concrete temperature during the construction of the bored pile. Thermophysical properties of permafrost around piles are tested. Based on the theory of three-phase unsteady heat conduction of soil, the inﬂuence of speciﬁc heat capacity, thermal conductivity, thermal diﬀusivity, and latent heat of phase transformation on the temperature change of a concrete pile is systematically studied. The thermal parameter is obtained which exerts the most signiﬁcant inﬂuence on the temperature ﬁeld. According to the inﬂuence degree of frozen soil on pile temperature, the order from high to low is thermal conductivity, thermal diﬀusivity, latent heat of phase change, and speciﬁc heat capacity. The changes in pile wall temperature caused by the change of these properties range between 2.60–10.97 ◦ C, 1.49– 9.39 ◦ C, 2.16–2.36 ◦ C, and 0.24–3.45 ◦ C, respectively. The change percentages of parameters vary between 35.77–47.12%, 12.22–40.20%, 12.46–32.25%, and 3.83–20.31%, respectively. Therefore, when designing and constructing concrete foundation piles, the inﬂuence of the thermal conductivity of frozen","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48774370","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

Mixed convection heat transfer of a nanofluid in a square ventilated cavity separated horizontally by a porous layer and discrete heat source 由多孔层和离散热源水平分隔的方形通风腔内纳米流体的混合对流换热

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Archives of Thermodynamics Pub Date : 2023-08-02 DOI: 10.24425/ather.2023.146560

Hamdi Messaoud, Sahi Adel, Ourrad Ouerdia

{"title":"Mixed convection heat transfer of a nanofluid in a square ventilated cavity separated horizontally by a porous layer and discrete heat source","authors":"Hamdi Messaoud, Sahi Adel, Ourrad Ouerdia","doi":"10.24425/ather.2023.146560","DOIUrl":"https://doi.org/10.24425/ather.2023.146560","url":null,"abstract":"Laminar mixed convection heat transfer in a vented square cavity separated by a porous layer ﬁlled with diﬀerent nanoﬂuids (Fe 3 O 4 , Cu, Ag and Al 2 O 3 ) has been investigated numerically. The governing equations of mixed convection ﬂow for a Newtonian nanoﬂuid are assumed to be two-dimensional, steady and laminar. These equations are solved numerically by using the ﬁnite volume technique. The eﬀects of signiﬁcant parameters such as the Reynolds number (10 ≤ Re ≤ 1000), Grashof number (10 3 ≤ Gr ≤ 10 6 ), nanoparticle volume fraction (0 . 1 ≤ φ ≤ 0 . 6), porous layer thickness (0 ≤ γ ≤ 1) and porous layer position (0 . 1 ≤ δ ≤ 0 . 9) are studied. Numerical simulation details are visualized in terms of streamline, isotherm contours, and average Nusselt number along the heated source. It has been shown that variations in Reynolds and Darcy numbers have an impact on the ﬂow pattern and heat transfer within a cavity. For higher Reynolds (Re > 100), Grashof (Gr > 10 5 ) numbers and nanoparticles volume fractions the heat transfer rate is enhanced and it is optimal at lower values of Darcy number (Da = 10 − 5 ). In addition, it is noticed that the porous layer thickness and location have a signiﬁcant eﬀect on the control of the heat transfer rate inside the cavity. Furthermore, it is worth noticing that Ag nanoparticles presented the largest heated transfer rate compared to other nanoparticles.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46224508","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: 1

The performance analysis of dusty photovoltaic panel 含尘光伏板的性能分析

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Archives of Thermodynamics Pub Date : 2023-08-02 DOI: 10.24425/ather.2023.146558

Minakshi Katoch, Vineet Dahiya, Surendra Kumar

{"title":"The performance analysis of dusty photovoltaic panel","authors":"Minakshi Katoch, Vineet Dahiya, Surendra Kumar","doi":"10.24425/ather.2023.146558","DOIUrl":"https://doi.org/10.24425/ather.2023.146558","url":null,"abstract":"Solar photovoltaic power is widely utilized in the energy industry. The performance of solar panels is inﬂuenced by diﬀerent variables, including solar radiation, temperature, wind speed, relative humidity and the presence of haze or dirt. Outdoor solar panels are particularly susceptible to a decrease in energy eﬃciency due to the accumulation of dust particles in the air, which occurs as a result of natural weather conditions. The extent of dust deposition is primarily determined by factors such as the tilt angle of the panel, wind direction, cleaning frequency as well as local meteorological and geographical conditions. The dust on the solar cell glazing reduces the optical transmittance of the light beam, causing shadowing and diminishing the energy conversion productivity of the panels. Sand storms, pollution levels and snow accumulations all signiﬁcantly impact the photovoltaic panel performance. These circumstances reduce the eﬃciency of solar panels. The experiment was carried out on two identical dust-accumulated and dust-free panels. The evaluation was carried out in two diﬀerent situations on the oﬀ-grid stand-alone system: in a simulated atmosphere and in an open space during the day. The current-voltage curves have been developed for both panels at various tilt degrees. The features provide suﬃcient information to analyse the performance of the panels under consideration. The measurements demonstrate that as dust collects on the panel’s surface, the average output power and short circuit current decrease dramatically. The installation tilt angle aﬀected the ratio of eﬃciency and average power outputs of dusty and clean panels.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48459778","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

Numerical study of MHD Williamson-nano fluid flow past a vertical cone in the presence of suction/injection and convective boundary conditions MHD williamson -纳米流体在吸力/喷射和对流边界条件下流过垂直锥的数值研究

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Archives of Thermodynamics Pub Date : 2023-08-02 DOI: 10.24425/ather.2023.146561

M. Sathyanarayana, T. R. Goud

引用次数: 0

Triple diffusive flow of Casson nanofluid with buoyancy forces and nonlinear thermal radiation over a horizontal plate 具有浮力和非线性热辐射的卡森纳米流体在水平板上的三重扩散流动

Archives of Thermodynamics Pub Date : 2023-07-26 DOI: 10.24425/ather.2019.128289

Manjappa Archana, Bijjanal Jayanna Gireesha, Ballajja Chandrappa Prasannakumara

引用次数: 28

Diffusive–inertial droplet separation model from two-phase flow 两相流中的扩散-惯性液滴分离模型

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Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2021.138113

引用次数: 0