Journal of Advanced Research in Fluid Mechanics and Thermal Sciences最新文献_第4页

Investigation on the Blade Number of Pico-scale Crossflow Turbine for Low Head by Numerical Method 用数值方法研究低水头微型贯流式涡轮机的叶片数

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-07-04 DOI: 10.37934/arfmts.118.2.112

Dendy Adanta, Ilham Saputra, Dewi Puspita Sari, Imam Syofii, Ismail Thamrin, Irsyadi Yani, Anthony Costa, Akbar Teguh Prakoso, Ahmad Fudholi, Wadirin

{"title":"Investigation on the Blade Number of Pico-scale Crossflow Turbine for Low Head by Numerical Method","authors":"Dendy Adanta, Ilham Saputra, Dewi Puspita Sari, Imam Syofii, Ismail Thamrin, Irsyadi Yani, Anthony Costa, Akbar Teguh Prakoso, Ahmad Fudholi, Wadirin","doi":"10.37934/arfmts.118.2.112","DOIUrl":"https://doi.org/10.37934/arfmts.118.2.112","url":null,"abstract":"Pico-scale crossflow turbines (CFT) can be an alternative solution to meet electrical energy needs, especially in remote rural areas. CFT is recommended because of its suitability in low head (< 5 m) conditions and fluctuating discharge conditions. One of the parameters that influences the performance of a CFT is the number of blades of the runner. CFT was discovered in 1903 and is still developing; however, the study of the physical phenomena of flow due to the blade number on the energy conversion process has yet to be comprehensively depicted. Therefore, this study aims to analyze the effect of the blade's number of runners on CFT performance using the computational fluid dynamics (CFD) method. The CFD method can visualize the flow field more detail than analytical and experimental. The CFD method is run with a moving mesh feature (transient) and pressure-based solver with a head condition of 3 m. The blades number studied were 16, 18, 22, 24, 26, and 30. Based on the results, the relationship of the CFT efficiency to blade number is described using a second-order multiple regression polynomial, and runner rotation is parabolic. Based on the performance curve, the CFT with 26 blades has the highest performance for low-head conditions.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141680081","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

Evaluation of the Electrical Power Transformer Fins Design Technology: Numerical Analysis and Experimental Validation 电力变压器鳍片设计技术评估：数值分析和实验验证

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI: 10.37934/arfmts.117.2.131146

Ali Shokor Golam

{"title":"Evaluation of the Electrical Power Transformer Fins Design Technology: Numerical Analysis and Experimental Validation","authors":"Ali Shokor Golam","doi":"10.37934/arfmts.117.2.131146","DOIUrl":"https://doi.org/10.37934/arfmts.117.2.131146","url":null,"abstract":"The study includes numerical analysis and experimental verification on an electrical power distribution transformer (250 kVA, 11 kW, Oil Natural Air Natural). ANSYS Fluent R3 2019 software was used to develop the numerical simulation model. The validity of the numerical model was confirmed by comparing the results of the numerical model and experimental data. The study aims to improve the efficiency and performance of electrical power distribution transformers by proposing a design that reduces the temperature of the transformer while maintaining its traditional size. Numerically, the effect of fin geometry on the temperature and density of transformer oil was studied. Four different fin designs were proposed and compared with the traditional design. According to the results, all proposed designs contributed to improving the cooling performance of the transformer compared to the traditional design. Design A is similar to the traditional transformer design, with the only modification being manipulation of the fin length, and achieves an average oil temperature reduction of 4 K. Design B showed the smallest temperature drop of the four designs, with a 3 K drop. Designs C and D include ventilation channels that match the shape of the fin, providing distinct design differences. The difference between both designs relied on the fact that for design C, the orthogonally of fin plates was retained. On the other hand, in design D, skewing of fin plates was introduced. Design D proved to be the most effective in reducing the average oil temperature, being reduced by 10 K. On the other hand, Design C reduced the average oil temperature by 7 K.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141275941","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

The Change of Flow Pattern from Stratified to Stratified-Wavy for Condensation in Wire on Tube Heat Exchangers 管线式热交换器中从分层到分层-波浪式冷凝的流动模式变化

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI: 10.37934/arfmts.117.2.105115

Louay Abd Al-Azez Mahdi, Hasanain Adnan Abdul Wahhab, Miqdam Tariq Chaichan

{"title":"The Change of Flow Pattern from Stratified to Stratified-Wavy for Condensation in Wire on Tube Heat Exchangers","authors":"Louay Abd Al-Azez Mahdi, Hasanain Adnan Abdul Wahhab, Miqdam Tariq Chaichan","doi":"10.37934/arfmts.117.2.105115","DOIUrl":"https://doi.org/10.37934/arfmts.117.2.105115","url":null,"abstract":"Flow patterns inside wire-on-tube condensers with different refrigerant mass flow rates were studied in a theoretical study. In this study, tubes with diameters of 3.25 mm (3/16\"), 4.83 mm (1/4\") and 6.29 mm (5/16\") were used. R-134a and R-600a cooling fluids were used at condensing temperatures of 54.4°C, 45°C, and 35°C. The results of this study were obtained using Equal Equation Solver (EES) software. The proposed model was able to predict the type of refrigerant flow pattern based on the limitations reported in previous studies. It was possible to distinguish four kinds of flow patterns: laminar, wavy laminar, plugged, and spiral. The first variation in flow pattern from laminar to wavy laminar flow found between 0.8 and 0.39, and a second variation in flow pattern found from wavy laminar flow to plug or slug flow between 0.15 and 0.05. For the refrigerant conditions, the condensation temperature did not affect the flow pattern. When using R-134a, the inner tube diameter had no effect on the flow pattern. Change occurs with R-600a as inner diameter was increased.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141281655","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

Mathematical Models of Natural Rubber Sheets Drying: Difference Acid Coagulation Cases 天然橡胶板干燥数学模型：差异酸凝案例

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI: 10.37934/arfmts.117.2.3745

Visit Eakvanich, Wachara Kalasee, Putipong Lakachaiworakun, Panya Dangwilailux, Wassachol Wattana

{"title":"Mathematical Models of Natural Rubber Sheets Drying: Difference Acid Coagulation Cases","authors":"Visit Eakvanich, Wachara Kalasee, Putipong Lakachaiworakun, Panya Dangwilailux, Wassachol Wattana","doi":"10.37934/arfmts.117.2.3745","DOIUrl":"https://doi.org/10.37934/arfmts.117.2.3745","url":null,"abstract":"The mathematical model for drying process is a useful tool in process optimization and drying chamber design. The research purposes of this study were to investigate the influence of drying temperature on drying time and the modelling the drying kinetics of the natural rubber (NR) sheets. The NR sheets which produce from commercial formic acid, commercial acetic acids, and ammonia plus commercial formic acid were studied at drying temperature of 40, 50, and 60oC and air speed of 0.5 m/s. The results indicated that the drying time was substantially reduced with an increase in temperature. The moisture content ratio of rubber sheets produce from commercial formic acid coagulation was similar to the sheets produce from commercial acetic acids coagulation. However, the drying time of them were longer than the drying time of the sheets produce from ammonia plus commercial formic acid coagulation. Finally, the logarithmic model was the best model which suitable to predict the moisture content ratio of the sheets drying with all experimental condition.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141276057","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

Effect of Indentation at Rolling Body Surfaces on the Film Formation in Elastohydrodynamic Lubrication Contact under Dynamic Loads 滚动体表面的压痕对动态载荷下弹性流体动力润滑接触中油膜形成的影响

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI: 10.37934/arfmts.117.2.157171

Dedi Rosa Putra Cupu, Kahar Osman

{"title":"Effect of Indentation at Rolling Body Surfaces on the Film Formation in Elastohydrodynamic Lubrication Contact under Dynamic Loads","authors":"Dedi Rosa Putra Cupu, Kahar Osman","doi":"10.37934/arfmts.117.2.157171","DOIUrl":"https://doi.org/10.37934/arfmts.117.2.157171","url":null,"abstract":"Vibration is one of the phenomena that can occur during the operation of roller bearing which can lead to dynamic loads being subjected to the contact and thus, affect the film formation in elastohydrodynamic (EHD) contacts. On the other hand, surface textures such as artificial indentations and grooves greatly affect the film formation as well as the corresponding pressure distribution in the contact area, since the depths of the textures are usually much greater than the film thickness in the contact. This paper investigates the influence of an artificial indentation located on the rolling element, which passes through a point contact under dynamic loads by means of numerical simulations. Solutions to the Reynolds equation are performed and calculations of the elastic deformation equation, force balance equation and lubricant properties equations to show the effects of both indentation passing through the contact and a sinusoidal dynamic load on the film thickness as well as pressure profile of EHD point contact. Moreover, the effect of frequency and amplitude excitation of the dynamic load on the film formation was investigated. The results revealed that the artificial indentation under sinusoidal dynamic load of EHD point contact induced a significant effect on the thickness of the film formation and pressure distribution.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141279319","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

Long-Term Solar Power Generation Forecasting in the Eastern Coast Region of Malaysia using Artificial Neural Network (ANN) Method 使用人工神经网络（ANN）方法对马来西亚东部沿海地区的太阳能发电量进行长期预测

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI: 10.37934/arfmts.117.2.6070

Muhammad Aiqal Iskandar, Muhammad Azfar Shamil Abd Aziz, S. S. Sivaraju, Nurdiyana Borhan, Wan Abd Al-Qadr Imad Wan Mohtar, Nurfadzilah Ahmad

{"title":"Long-Term Solar Power Generation Forecasting in the Eastern Coast Region of Malaysia using Artificial Neural Network (ANN) Method","authors":"Muhammad Aiqal Iskandar, Muhammad Azfar Shamil Abd Aziz, S. S. Sivaraju, Nurdiyana Borhan, Wan Abd Al-Qadr Imad Wan Mohtar, Nurfadzilah Ahmad","doi":"10.37934/arfmts.117.2.6070","DOIUrl":"https://doi.org/10.37934/arfmts.117.2.6070","url":null,"abstract":"Accurate prediction of power demand and generation is crucial for modern energy systems to efficiently allocate resources and facilitate energy trading. The integration of artificial intelligence (AI) and machine learning techniques has significantly improved the precision of power forecasting. This study focuses on the application of Artificial Neural Networks (ANN) for forecasting power generation in the Eastern Coast region of Malaysia, with a specific emphasis on solar power. The research methodology involves collecting and analyzing historical power data, weather data, and relevant variables. ANN models are trained, validated, and tested on a selected power grid to assess their accuracy and predictive capabilities. The expected outcomes aim to include the development of a precise power generation forecasting model, providing valuable insights for decision-makers to optimize energy operations and seamlessly integrate renewable sources. Additionally, the study explores potential challenges, limitations, and best practices associated with ANN-based power forecasting. The dataset covers the period from 2020 to 2023, with variables such as average output power, ambient temperature, PV module temperature, global horizontal irradiance, and wind speed recorded at 30-minute intervals. The architecture of the ANN model, implemented using the Keras framework, is described as a Sequential model with layers utilizing the 'ReLU' activation function. Model evaluation employs metrics like root mean square error (RMSE), mean square error (MSE), and mean absolute error (MAE) on the test set, offering insights into the model's overall fit, average deviation, and sensitivity to outliers. Results reveal strong correlations between PV module temperature, irradiance, and AC power generated.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141276104","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

Innovative Solutions for Melaka's River Water Treatment 马六甲河水处理的创新解决方案

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI: 10.37934/arfmts.117.2.2836

Lee Kai Huang, Mirza Farrukh Baig, Ervina Efzan Mhd Noor

引用次数: 0

Time-Depending Flow of Ternary Hybrid Nanofluid Past a Stretching Sheet with Suction and Magnetohydrodynamic (MHD) Effects 具有吸力和磁流体动力（MHD）效应的三元混合纳米流体在拉伸片上的随时间变化的流动

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI: 10.37934/arfmts.117.2.1527

Farah Nadzirah Jamrus, Iskandar Waini, Anuar Ishak

引用次数: 0

Numerical Simulation and Thermal Analysis of Pressurized Hydrogen Vehicle Cylinders: Impact of Geometry and Phase Change Materials 加压氢气汽车气缸的数值模拟和热分析：几何形状和相变材料的影响

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI: 10.37934/arfmts.117.2.7190

Mohamed-Amine Babay, Mustapha Adar, Souad Touairi, Ahmed Chebak, Mustapha Mabrouki

{"title":"Numerical Simulation and Thermal Analysis of Pressurized Hydrogen Vehicle Cylinders: Impact of Geometry and Phase Change Materials","authors":"Mohamed-Amine Babay, Mustapha Adar, Souad Touairi, Ahmed Chebak, Mustapha Mabrouki","doi":"10.37934/arfmts.117.2.7190","DOIUrl":"https://doi.org/10.37934/arfmts.117.2.7190","url":null,"abstract":"This comprehensive study investigates the nuanced aspects of pressurized hydrogen vehicle cylinders during refueling, employing numerical simulation and thermal analysis. The examination encompasses the intricate dynamics influenced by cylinder geometry, mass flow rate variations, and the integration of phase change materials (PCMs). Simulations involving cylinders with diverse length-to-diameter ratios and inlet diameters highlight the impact of these parameters on temperature control. Notably, smaller length-to-diameter ratios prove effective for temperature regulation, while larger inlet diameters mitigate temperature rise. The study further explores the role of varying mass flow rates, revealing that an increasing flow rate during refueling results in the lowest temperature rise. In addition to geometry and mass flow rate considerations, the integration of PCMs is a focal point. Modeling and parametric analysis are employed to assess the feasibility of incorporating these materials. The study contributes valuable insights into optimizing the thermal performance and safety of hydrogen fuel systems. The holistic approach considers the interplay of geometry, mass flow rate dynamics, and the innovative use of PCMs, offering a multifaceted understanding of the factors influencing pressurized hydrogen vehicle cylinders.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141277528","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

Sensitivity Analysis of MHD Hybrid Nanofluid Flow over a Radially Shrinking Disk with Heat Generation 带有热量产生的径向收缩盘上 MHD 混合纳米流体流动的灵敏度分析

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI: 10.37934/arfmts.117.2.116130

Najiyah Safwa Khashi’ie, Mohd Fariduddin Mukhtar, Nurul Amira Zainal, Khairum Hamzah, Iskandar Waini, Abdul Rahman Mohd Kasim, Ioan Pop

{"title":"Sensitivity Analysis of MHD Hybrid Nanofluid Flow over a Radially Shrinking Disk with Heat Generation","authors":"Najiyah Safwa Khashi’ie, Mohd Fariduddin Mukhtar, Nurul Amira Zainal, Khairum Hamzah, Iskandar Waini, Abdul Rahman Mohd Kasim, Ioan Pop","doi":"10.37934/arfmts.117.2.116130","DOIUrl":"https://doi.org/10.37934/arfmts.117.2.116130","url":null,"abstract":"This work features the numerical computation and statistical analysis (response surface and sensitivity) for the flow and thermal progress of an axisymmetric copper-alumina/water hybrid nanofluid subjected to a permeable shrinking disk. The simultaneous factors of magnetic field (MHD), heat generation and suction parameter in the heat transfer development and flow characteristic are observed. The flow and energy equations are mathematically developed based on the boundary layer assumptions. These equations are then simplified with the aids of the similarity variables. The numerical results are then generated by the bvp4c solver in the Matlab software. The dual solutions are possible and exist up to a separation value upon the inclusion of suction effect. The increment of heat generation parameter from 0% to 1% reduces the heat transfer rate for all values of the stretching/shrinking parameter. For the response surface analysis, the responses (skin friction coefficient and heat transfer rate) are analyzed for three factors (magnetic, suction, heat generation) and three magnitudes (low, medium, high). Based on this analysis, the magnetic and suction parameters provide a significant effect on the skin friction with p-values < 0.05. Meanwhile, for the heat transfer coefficient, all factors give significant impact with zero p-values. Meanwhile, the sensitivity analysis reveals that the suction parameter has higher sensitivity to the heat transfer as compared to the magnetic and heat generation parameter. Even though these parameters being less sensitive, their influence on heat transfer remains statistically significant.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141279458","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