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Numerical simulation of the gas flow through the rectangular channel with perforated plate 穿孔板矩形通道内气体流动的数值模拟
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220426089m
Z. Marković, M. Eric, R. Jovanović, I. Lazović
{"title":"Numerical simulation of the gas flow through the rectangular channel with perforated plate","authors":"Z. Marković, M. Eric, R. Jovanović, I. Lazović","doi":"10.2298/tsci220426089m","DOIUrl":"https://doi.org/10.2298/tsci220426089m","url":null,"abstract":"The perforated plates are commonly used for gas flow control in the wide-angle diffusers of electrostatic precipitators of large power plants. Many studies dealt with the investigation of the effects of the perforated plate?s geometry on flow parameters in the cases where incoming flow is perpendicular to the plate and the plate is covering the whole cross-section of the flowing channel. These results are partially applicable in cases where flow is inclined on the plate or when the plate is not occupying the whole cross-section of the channel. The subject of this work is a numerical investigation of flow through the rectangular channel with a perforated plate in various positions in the cross-section of the channel. The aim was to investigate the effect of the plate position on the flow. The perforated plates were modeled as thin porous media of finite thickness by using the directional loss model. Numerical experiments are carried out by using Computational Fluid Dynamics software Ansys CFX. Results of pressure drop and velocity distribution behind the plate are compared to the results of CFD simulation of the full 3D plate model. In order to obtain a reasonable agreement both of the pressure drop and velocity distribution behind the plate when using a simplified thin porous plate model, the value of streamwise permeability of the plate had to be adjusted. The level of adjustments has determined iteratively and it depends on the plate position in the channel?s cross-section.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68242276","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
Examination of Stirling engine parameters effect on its thermal efficiency using PROSA software 利用PROSA软件研究斯特林发动机参数对热效率的影响
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220617139r
Louiza Rabhi, H. El, N. Boutammachte, A. Khmou
{"title":"Examination of Stirling engine parameters effect on its thermal efficiency using PROSA software","authors":"Louiza Rabhi, H. El, N. Boutammachte, A. Khmou","doi":"10.2298/tsci220617139r","DOIUrl":"https://doi.org/10.2298/tsci220617139r","url":null,"abstract":"This paper uses second-order software for evaluating five Stirling engine parameter?s effect on its performance to select an appropriate configuration with optimal dimensions for its use in a concentrated solar power plant. Appropriate configuration, heater shape, bundle tube heat exchanger size, and regenerator type and geometry are studied. Results show that Alpha type Stirling engine is the most suitable for high-temperature differences, U-shaped tubes are advantageous in combining good efficiency and fewer pressure losses. Shortening inner diameter and increasing U-shaped tubes number is a good strategy to increase engine efficiency also an increase in tubes length generates a reduction in engine efficiency. Regarding the regenerator, the wire mesh regenerator presents a good compromise between minimum pressure drop and heat losses and provides better engine efficiency. For its size, better efficiency is obtained for a thicker mesh.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68245214","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
Analyze two-dimensional heat transfer of ultrafast laser heated thin films under siz effects 分析了尺寸效应下超快激光加热薄膜的二维传热特性
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220819043m
Yudong Mao, Guochen Zhao, Mingzhi Yu, Xianzheng Wang, Jin Li, Kaimin Yang, Shouyu Liu
{"title":"Analyze two-dimensional heat transfer of ultrafast laser heated thin films under siz effects","authors":"Yudong Mao, Guochen Zhao, Mingzhi Yu, Xianzheng Wang, Jin Li, Kaimin Yang, Shouyu Liu","doi":"10.2298/tsci220819043m","DOIUrl":"https://doi.org/10.2298/tsci220819043m","url":null,"abstract":"An improved dual-phase-lagging (DPL) model which reflects size effects caused by nanostructures is utilized to investigate the two-dimensional thermal conduction of nano silicon films irradiated by ultrafast laser. The integral transformation method is used to solve the conduction governing equation based on the improved DPL model. The variation of the internal temperature along the thickness direction and the radial direction of the thin film is analyzed. We find that the temperature increases rapidly in the heated region of the film, and as time goes by, the energy travels from the heated end to another end in a form of wave. Although both the improved DPL model and the DPL model can obtain similar thermal wave temperature fields, the temperature distribution in the film obtained by the improved DPL model is relatively flat, especially for high Knudsen number. Under the same Knudsen number, the temperature obtained by the two-dimensional improved DPL model is higher than that obtained by the one-dimensional model, and the temperature difference becomes larger and larger as time elapses.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68246522","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 on characteristic and mechanism of simulated lunar rock destruction under high energy laser irradiation 高能激光辐照下模拟月球岩石破坏特性及机理的实验研究
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220807003z
Xuemin Zhou, Chuo Zhang, Junjun Liu, Haiyong Hao, Zheng Gao, Yan Wu, Qiu-Yue Li, Xiang Wen, Xuan Wang, Zhaoliang Yang
{"title":"Experimental study on characteristic and mechanism of simulated lunar rock destruction under high energy laser irradiation","authors":"Xuemin Zhou, Chuo Zhang, Junjun Liu, Haiyong Hao, Zheng Gao, Yan Wu, Qiu-Yue Li, Xiang Wen, Xuan Wang, Zhaoliang Yang","doi":"10.2298/tsci220807003z","DOIUrl":"https://doi.org/10.2298/tsci220807003z","url":null,"abstract":"The large load and poor heat dissipation of moon rock core drilling leads to the difficulty of rock breaking and low drilling and sampling efficiency. As a new auxiliary rock breaking method, laser rock breaking is expected to be applied to perturbation sampling in lunar rock drilling. Revealing the fracture characteristics and mechanism of rock under laser irradiation is an important basis for realizing laser-assisted lunar rock sampling. Basalt was used as simulated lunar rock sample, and its mechanical response characteristics under laser irradiation were analyzed from macro to micro point of view, and the failure law under different laser power and different irradiation time was explored. The results show that the failure of the sample under laser irradiation is mainly characterized by local rock melting and dynamic crack propagation, and the surface temperature of the sample follows the characteristics of Gaussian distribution. The laser power has a greater influence on the degree of rock weakening than the irradiation time. Laser irradiation of rocks can significantly reduce rock strength, and has obvious effects on improving rock breaking efficiency and reducing in situ disturbance. It is expected to provide theoretical and technical support for assisting lunar rock drilling and sampling in the future.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68246647","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: 1
A novel coupling discretization method for modeling multi-phase heat exchangers 一种新的多相换热器耦合离散化建模方法
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220909044c
Zhenhao Chu, Daocang Che, Zhaowang Xia
{"title":"A novel coupling discretization method for modeling multi-phase heat exchangers","authors":"Zhenhao Chu, Daocang Che, Zhaowang Xia","doi":"10.2298/tsci220909044c","DOIUrl":"https://doi.org/10.2298/tsci220909044c","url":null,"abstract":"This paper presents a novel coupling discretization method for modeling multi-phase heat exchangers. In the method, the MBM (Moving Boundary Method) is adopted as the solver to solve each of the FVCVs (Finite Volume Control Volume) divided by the method of FVM (Finite Volume Method). When all FVCVs are solved, the FVCV boundary values are updated based on the relationships of FVCVs. The solving procedure is initiated when the starting values of HSF (Hot Source Fluid) and CSF (Cold Source Fluid) outlet of the heat exchanger are given by the user and terminated when these values no longer change anymore. The experimental results of a plate heat exchanger with R245fa and Therminol 66 as CSF and HSF are adopted to validate the proposed model. Simulation results of 11 operating conditions show that the maximum deviation is within ?4% compared to the measured values. The model presented in this paper is appropriate for heat exchangers under operating conditions either with or without fluid phase change, such as the evaporator and condenser in the ORC (Organic Rankine Cycle) system.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68247637","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
Process parameters optimization of water-waste derived biodiesel emulsion to permute as a sustainable and greener energy source 废水衍生生物柴油乳液的工艺参数优化,使其成为一种可持续的绿色能源
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220909091g
Mahesh Gurusamy, Muralidharan Kandasamy, Suresh Vellaiyan
{"title":"Process parameters optimization of water-waste derived biodiesel emulsion to permute as a sustainable and greener energy source","authors":"Mahesh Gurusamy, Muralidharan Kandasamy, Suresh Vellaiyan","doi":"10.2298/tsci220909091g","DOIUrl":"https://doi.org/10.2298/tsci220909091g","url":null,"abstract":"The present study aims to optimize the process parameters to formulate a stable water-biodiesel emulsion fuel and permute it as a sustainable and greener source for biofuel application. Biodiesel is derived from waste orange peels and its chemical constituents are characterized. Water emulsion in base fuel is considered to promote energy-and-environmental impacts. As the quality of emulsion fuel depends on the physicochemical properties which are directly influenced by base fuel, water, and surfactant concentrations, a multi-response optimization tool is implemented to derive the optimum levels for process parameters. The optimization result shows that the base diesel blended with 30% orange peel oil, 10 % water, and 1 % surfactant promotes superior fuel quality, and the water has a maximum influence on fuel quality (54.41 %). The emission assessment at peak brake mean-effective indicates that the hydrocarbon, carbon monoxide, oxides of nitrogen, and smoke emissions are reduced by 26.9 %, 49 %, 4.1 %, and 17.2 % at optimal conditions compared to base diesel, respectively.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68247721","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
Three-dimensional problem of temperature and thermal flux distribution around defects with temperature-dependent material properties 具有温度相关材料性质缺陷的三维温度和热通量分布问题
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci221003028z
Qianqian Zhang, Hao Song, Cunfa Gao
{"title":"Three-dimensional problem of temperature and thermal flux distribution around defects with temperature-dependent material properties","authors":"Qianqian Zhang, Hao Song, Cunfa Gao","doi":"10.2298/tsci221003028z","DOIUrl":"https://doi.org/10.2298/tsci221003028z","url":null,"abstract":"The analytical solution of three-dimensional heat conduction problem, including the temperature and thermal flux fields, is one of the important problems that have not been completely solved in solid mechanics. Considering the temperature dependence of material parameters makes the problem more difficult. In this paper, we first reduce the three-dimensional temperature-dependent heat conduction problem to the solution of three-dimensional Laplace equation by introducing the intermediate function. Then, the generalized ternary function is proposed, and the general solution of three-dimensional Laplace equation is given. Finally, the analytical solutions of three specific problems are obtained and the corresponding temperature-thermal flux fields are discussed. The results show that the thermal flux field of three-dimensional temperature dependent problem is the same as the classical constant thermal conductivity approach result, while the temperature field is different from the classical result. Thermal flux at a planar defect boundary has r-1/2 singularity, and its intensity is proportional to the fourth root of defect width. On the other hand, when blocked by a planar defect, the thermal flux distribution will re-adjusted so that it overflows at the same rate from all parts of the planar defect boundary.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"10 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68248863","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
Experiment and simulation studies on thermal performance of a novel water-cooling premixed wall-hung gas boiler 新型水冷预混壁挂燃气锅炉热工性能的实验与仿真研究
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci221017067w
Ning Wang, S. Deng, Zongyi Wang, Y. Gui, M. Le, Qinxin Zhao, Huaishuang Shao
{"title":"Experiment and simulation studies on thermal performance of a novel water-cooling premixed wall-hung gas boiler","authors":"Ning Wang, S. Deng, Zongyi Wang, Y. Gui, M. Le, Qinxin Zhao, Huaishuang Shao","doi":"10.2298/tsci221017067w","DOIUrl":"https://doi.org/10.2298/tsci221017067w","url":null,"abstract":"A wall-hung gas boiler was innovatively proposed and designed in this paper. Water-cooling premixed combustion and enhanced condensation heat exchange technology were adopted in the boiler. The extruded aluminum plate-fin structure was adopted in the burner and condensing heat exchanger. Experiment and numerical simulation studies were conducted on the flow, combustion, and heat exchange characteristics of the boiler. The effect of the fin structure, excess air coefficient, heat load, and water-cooling temperature on the thermal performance of the boiler was analyzed. The results showed that reliable ignition, stable combustion, uniform flame distribution, and low pollutant emissions can be achieved in the wall-hung gas boiler. Affected by burning intensity and internal flue gas recirculation, when the burner plate-fin gap was 1.63 mm, the flame was the shortest and the NOx emissions were the lowest. Under this fin condition, ultra-high efficiency and ultra-low emissions can be achieved in the boiler with a low excess air coefficient. When the excess air coefficient was 1.3, the NOx emissions were less than 30 mg/m3 at the heat load of 4-14 kW, and the thermal efficiency can reach up to 102.8% at the rated load of 14 kW. Within the scope of the experiment, the NOx emissions changed little with the water-cooling temperature. At the temperature of 333 K, there was still a great NOx emission reduction effect.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68249088","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
Direct numerical simulation of double diffusive natural convection in a closed mixture cavity heated from below 从下加热的密闭混合腔内双扩散自然对流的直接数值模拟
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci221107069x
Yaowen Xia, Juan Chen
{"title":"Direct numerical simulation of double diffusive natural convection in a closed mixture cavity heated from below","authors":"Yaowen Xia, Juan Chen","doi":"10.2298/tsci221107069x","DOIUrl":"https://doi.org/10.2298/tsci221107069x","url":null,"abstract":"Double diffusive natural convection is one of the most widely used study subjects in heat and mass transfer. In this present study, double diffusive natural convection heating from below the wall in a closed cavity was studied with DNS method. The flow characteristics are presented as isotherms, iso concentrations, and streamlines. The results show that RaT has signification strong effects on average Nusselt number, with a more considerable RaT, the value of Nusselt number more higher. These were also found to increase with increasing buoyancy ratio for adding flow and decrease as buoyancy ratio decreases for opposing flows.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68249894","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
Heat transfer enhancement in a helically coiled convergent and divergent tube heat exchanger with alumina oxide nanofluid 氧化氧化铝纳米流体对螺旋盘管换热器传热的增强作用
IF 1.7 4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci221205140s
Nandhakumar Shankar, Perumalsamy Sethusundaram Parambakkattur, M. Chandran
{"title":"Heat transfer enhancement in a helically coiled convergent and divergent tube heat exchanger with alumina oxide nanofluid","authors":"Nandhakumar Shankar, Perumalsamy Sethusundaram Parambakkattur, M. Chandran","doi":"10.2298/tsci221205140s","DOIUrl":"https://doi.org/10.2298/tsci221205140s","url":null,"abstract":"In this investigation, the analysis of the heat transfer coefficient of a shell, helically coiled convergent-divergent tube heat exchanger has been carried out by utilizing Al2O3/water nanofluid. The nanofluid was prepared using a two-stage technique with proportions of 0.1vol%, 0.3vol%, and 0.5vol%. The inner heat transfer coefficient, overall heat transfer coefficient, and Nusselt number were analyzed and it found that the heat transfer coefficient is increased, with increase of inner dean number and particle volume concentration. The experimental tests were carried out in the range of 1100<De<4200. When compared to base fluid, the overall heat transfer coefficient improved by 27%, 55%, and 78% at 0.1%, 0.3% and 0.5% with Al2O3/water Nanofluid respectively. When compared to base fluid at a fixed dean number, the increase in Nusselt number was viewed as 27%, 51%, and 72% at 0.1%, 0.3%, and 0.5% of Al2O3/water nanofluid, respectively. The investigations of enhancement were increased due to increased nanofluid thermal conductivity while increasing the %vol concentration and Brownian movement of the nanoparticles. The viscosity of nanofluid is increased with increase of particle volume which increase the pressure drop. It is concluded the convergent-divergent helically coiled tube heat exchangers along with nanofluid is able to enhance the heat transfer with considerable pressure drop. There is no adverse effect on the development of optional streams or the blending of liquids.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68250589","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
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