Thermal Science最新文献_第3页

Estimation of reliability in multicomponent stress-strength based on exponential Frechet distributions 基于指数Frechet分布的多分量应力强度可靠性估计

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303747s

Li-Feng Shang, Zai-zai Yan

引用次数: 0

Fractional dual-phase-lag heat conduction with periodic heating and photothermal response 具有周期性加热和光热响应的分数双相滞后热传导

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230201086s

A. Somer, A. Novatski, M. Lenzi, S. Da, E. Lenzi

引用次数: 0

Modelling of mixed thermodynamic model based on new materials 基于新材料的混合热力学模型建模

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2302067g

Chengwei Geng

{"title":"Modelling of mixed thermodynamic model based on new materials","authors":"Chengwei Geng","doi":"10.2298/tsci2302067g","DOIUrl":"https://doi.org/10.2298/tsci2302067g","url":null,"abstract":"In order to solve the problem of the performance of mixed alkane phase change energy storage materials, this paper proposes the modelling research of mixed thermodynamic model based on new materials. In this paper, the thermodynamic performance of binary mixed alkane system is studied, the influence of phase transition temperature, phase transition enthalpy and its composition on the mixed alkane system is explored, and its solid-liquid phase diagram is drawn. We used different thermodynamic models to predict the phase transition temperature and enthalpy in the melting process of binary mixed alkanes, which were mutually verified with the experimental results. The experimental results show that C9-C10 and C9-C11 systems exhibit eutectic behavior. The eutectic components are 88% (mass fraction, the rest is the same) C9-12% C10 and 90% C9-10% C11. The eutectic temperatures are 218.25 K and 215.15 K, respectively. The C8-C9 system has peritectic phenomenon, C10-C11 system shows complete mutual solubility, and their mini?mum melting points are 200.25 K and 234.35 K, respectively. Conclusion is that the C9-C10 and C9-C11 eutectic systems are suitable for low temperature phase change materials in the temperature range of 210-220 K, providing data reference for their application in low temperature energy storage.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68259197","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 solution for stochastic heat equation with Neumann boundary conditions 具有Neumann边界条件的随机热方程的数值解

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1057r

S. Raja Balachandar, D. Uma, H. Jafari, S. Venkatesh

引用次数: 0

Local meshless collocation scheme for numerical simulation of space fractional PDE 空间分数阶偏微分方程数值模拟的局部无网格配置方案

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1101s

M. Shakeel, M. Khan, I. Ahmad, H. Ahmad, Nantapat Jarasthitikulchai, W. Sudsutad

引用次数: 7

Theoretical and numerical analysis of the fixed flat-plate solar collector with Sn-Al2O3 selective absorber and gravity water flow 具有Sn-Al2O3选择性吸收和重力水流的固定平板太阳能集热器的理论和数值分析

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230225100n

A. Nešović, N. Lukic, D. Cvetkovic, Miljan Marašević, Marko Topalovic

{"title":"Theoretical and numerical analysis of the fixed flat-plate solar collector with Sn-Al2O3 selective absorber and gravity water flow","authors":"A. Nešović, N. Lukic, D. Cvetkovic, Miljan Marašević, Marko Topalovic","doi":"10.2298/tsci230225100n","DOIUrl":"https://doi.org/10.2298/tsci230225100n","url":null,"abstract":"This paper presents two methods (theoretical and numerical) for the thermal analysis of the previously experimentally installed solar collector construction at the Faculty of Engineering in Kragujevac - a fixed flat-plate solar collector with Sn-Al2O3 selective absorber and gravity water flow. The theoretical research was based on the application of a specific calculation algorithm with a triple iterative procedure, i.e. with a three-stage check of all important performance indicators of the fixed flat-plate solar collector. In the numerical phase of the research, Simple Linear Regression was applied to experimentally measured values of solar radiation intensity and experimentally determine values of heat power to form simple equations that could be used to predict the thermal performance of similar solar structures in the future. The results of theoretical and numerical studies showed agreement with experimental studies, because in the first case, the absolute measurement error was less than 10%, while in the second case, the determination coefficient was greater than 90%, so the authors hope that this work will be useful to the wider scientific community.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68260251","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

Preparation and properties of silicate inorganic external wall insulation materials based on heat storage 基于蓄热的硅酸盐无机外墙保温材料的制备及性能研究

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2302941l

Qing Li, Hao Chen, Zhidong Li

{"title":"Preparation and properties of silicate inorganic external wall insulation materials based on heat storage","authors":"Qing Li, Hao Chen, Zhidong Li","doi":"10.2298/tsci2302941l","DOIUrl":"https://doi.org/10.2298/tsci2302941l","url":null,"abstract":"In this article, the foaming slurry after the reaction of silicate inorganic gelling material sodium silicate and foaming agent azodicamide is taken as the main investigation object, and the mechanism of bubble nucleation and the effect of physical parameters such as temperature, time, viscosity and surface tension on the structure of bubble pores are analyzed. As well as the influence of processing technology such as foiling temperature, heating rate, holding time and various kinds of modifiers on the structure and properties of the material, the appropriate processing technology conditions and modifiers are screened out, and an inorganic foiling insulation material with light weight, high strength, heat preservation, fire prevention, no pollution, low cost, simple process and easy to use is prepared. The experimental results show that, although the properties of the prepared material are better with the increase of azodicarbonamide (ADC) content and viscosity, the maximum amount of ADC added is only 1%. When the ADC content in the system is greater than 1%, the foaming slurry will appear gel, which is not conducive to the late high temperature foaming and the uniformity of the final product. Therefore, the optimal amount of ADC is 1% of the mass of sodium silicate.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68260759","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

Regularity for a non-local diffusion equation with Riemann-Liouville derivative 一类具有Riemann-Liouville导数的非局部扩散方程的正则性

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1373t

N. Tuan, Devendra Kumar, Anh Nguyen

引用次数: 0

Experimental investigation of the effect of the use of nanoparticle additional biodiesel on fuel consumption and exhaust emissions in tractor using a coated engine 使用纳米颗粒附加生物柴油对使用涂层发动机的拖拉机燃料消耗和废气排放影响的实验研究

4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2304189o

Salih Ozer, Fatih Haciyusufoglu, Erdinc Vural

{"title":"Experimental investigation of the effect of the use of nanoparticle additional biodiesel on fuel consumption and exhaust emissions in tractor using a coated engine","authors":"Salih Ozer, Fatih Haciyusufoglu, Erdinc Vural","doi":"10.2298/tsci2304189o","DOIUrl":"https://doi.org/10.2298/tsci2304189o","url":null,"abstract":"This study focuses on reducing the fuel consumption and exhaust gas emission values of the tractor used in the agricultural field. With the additive added to the fuel and the coating of the tractor engine, the fuel consumption values were reduced, and agricultural production costs were tried to be reduced. On the other hand, exhaust emission values were also tried to be reduced and thus a more environmentally friendly production method was aimed to be adopted. For this reason, the cylinders of the tractor engine were coated with Al2O3 + 13%TiO2 metal powders mixed by mass using the plasma spray method. All experiments were repeated by attaching these coated pistons to the engine. The fuel used in the experiments was purchased from a commercial company and the nanoparticle (molybdenum) additive was added to the biodiesel at the rates of 25 ppm, 50 ppm, 100 ppm, and 200 ppm by mass. The fuel mixtures obtained in the coated and uncoated engine, when the engine is in the full throttle position, using the PTO load test unit at 1000 rpm, 1200 rpm, 1400 rpm, 1600 rpm, 1800 rpm, and 2000 rpm. It has been tested by loading at 2200 rpm, 2400 rpm, and 2600 rpm engine speeds. Code for the Official Testing of Agricultural and Forestry Tractor Performance standards were adhered to during all engine tests. The results showed that coating the cylinders and adding nanoparticles into biodiesel reduces the fuel consumption value, increases the exhaust gas temperature, decreases HC, CO, and PM emissions, and increases NOx emissions.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135440236","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 simulation of slip behaviors and friction reduction effects in hydrophobic micro-channel in laminar flow conditions 层流条件下疏水微通道滑移行为及减摩效应的数值模拟

4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2304405d

Bekir Dogan, Mustafa Ozbey, Lutfu Namli, Unsal Aybek

{"title":"Numerical simulation of slip behaviors and friction reduction effects in hydrophobic micro-channel in laminar flow conditions","authors":"Bekir Dogan, Mustafa Ozbey, Lutfu Namli, Unsal Aybek","doi":"10.2298/tsci2304405d","DOIUrl":"https://doi.org/10.2298/tsci2304405d","url":null,"abstract":"In the study, a numerical simulation of the sliding properties of the rough and smooth surfaces with micro-structure was made. The simulation of shear flow in the micro-channel was performed with ANSYS FLUENT software. The 3-D and two-phase flow is simulated by choosing the volume of fluid model. In CFD analysis, water and air consist of two immiscible phases. In the calculations, if water is the first fluid and air is the second fluid, adjustments are made. At the beginning of the analysis, the channel was considered to be completely filled with air and the effect of gravity was ignored during the calculation. Water and air are considered Newtonian and incompressible fluids. In addition, laminar flow and steady-state calculations are made. It was found that the decrease in pressure drop increased with increasing distance between asperities (no-shear fraction). In the simulation results, approximately 14% of the velocity in the micro-channel axis was measured at the interface. The main purpose of this study is to evaluate the applicability of the volume of fluid model in a hydrophobic micro-channel flow designed in 3-D using ANSYS Fluent CFD software.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135440748","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