Journal of Advanced Research in Fluid Mechanics and Thermal Sciences最新文献_第7页

Experimental and Theoretical Assessment of Inverter-Operated Split Air Conditioner with Low GWP Alternative Refrigerants 使用低全球升温潜能值替代制冷剂的变频操作分体式空调的实验和理论评估

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-17 DOI: 10.37934/arfmts.117.1.143154

Ashish Shivkumar Utage, Kundlik Vitthal Mali, Heramb C. Phadake

{"title":"Experimental and Theoretical Assessment of Inverter-Operated Split Air Conditioner with Low GWP Alternative Refrigerants","authors":"Ashish Shivkumar Utage, Kundlik Vitthal Mali, Heramb C. Phadake","doi":"10.37934/arfmts.117.1.143154","DOIUrl":"https://doi.org/10.37934/arfmts.117.1.143154","url":null,"abstract":"This article presents experimental evaluation and comparative analysis of low GWP alternative refrigerants, namely HC-290 (propane), HC-1270 (propylene), HC/HC-1270 blend, and HFC-32 (difluoro methane) as drop-in replacements for HCFC-22 (Chloro difluoro methane) in a typical 1.5 TR capacity inverter operated split type air conditioner (SAC). The experimental setup consisted of retrofitting an original HCFC-22 test unit following the soft optimization of the SAC system for each alternative refrigerant, followed by testing under controlled operating conditions as per the IS 1391, Part-1 standard at the half capacity and the rated capacity of inverter SAC. The results obtained were compared against the baseline HCFC-22 test unit. The optimized SAC gave EERIS (Indian Seasonal Energy Efficiency Ratio) of 4.63 for HC-290, 4.71 for HC-1270 and 4.87 for HC-290/HC-1270 blend, respectively increased by 8.94 %, 10.82 % and 14.58 % compared to HCFC-22. HFC-32 delivered the maximum cooling capacity of 6.78 kW, 3.67 % higher than baseline unit at the rated capacity. HC-290/HC-1270 blend exhibited the lowest power consumption and discharge temperature amongst all the refrigerants considered. The charge of flammable refrigerants has been optimized below LFL satisfying EN378 standard for the safety of inverter SAC in domestic applications.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":" 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141126830","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

Potential of Biogas Production from Anaerobic Co-digestion of Hydrothermal Pre-treated OPEFB and Digested Sludge 厌氧协同消化经热预处理的 OPEFB 和消化污泥产生沼气的潜力

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-17 DOI: 10.37934/arfmts.117.1.155163

Muhammad Bukhari Rosly, Pramila Tamunaidu, Nurhamieza Md Huzir, Azlan Nur Rasyid Amin, Masafumi Goto, Abd Halim Md Ali, Mohd Danial Muhd Ali

{"title":"Potential of Biogas Production from Anaerobic Co-digestion of Hydrothermal Pre-treated OPEFB and Digested Sludge","authors":"Muhammad Bukhari Rosly, Pramila Tamunaidu, Nurhamieza Md Huzir, Azlan Nur Rasyid Amin, Masafumi Goto, Abd Halim Md Ali, Mohd Danial Muhd Ali","doi":"10.37934/arfmts.117.1.155163","DOIUrl":"https://doi.org/10.37934/arfmts.117.1.155163","url":null,"abstract":"The palm oil industry plays a vital role in Malaysia, but it generates substantial amounts of biomass waste, which, if not properly managed, can lead to environmental pollution. Among these waste products, oil palm empty fruit bunch (OPEFB) is the most abundant and underutilized, being generated daily without any commercial value. The aim is to efficiently convert OPEFB into fermentable sugars for improved biogas production. Nevertheless, the challenge lies in efficiently degrading OPEFB within a short timeframe before fermentation into biogas can occur. This study aims to explore the potential of hydrothermal pre-treatment as a means to enhance biogas production from OPEFB. The pre-treatment process was optimized by varying reaction temperatures (100 to 250°C), and reaction times (10 to 40 minutes). The main objective was to maximize the total soluble sugar yield, a crucial precursor for efficient biogas production. The optimal conditions for hydrothermal pre-treatment are identified at a temperature of 175°C and a reaction time of 20 minutes, resulting in a yield of 49.2 mg of glucose per gram of OPEFB. Subsequent anaerobic co-digestion of the treated OPEFB with digested sludge increased methane yield to 100.53 ml/g-VS, representing a remarkable 392% increase compared to the low 20.44 ml/g-VS produced by untreated OPEFB. Nonetheless, elevated pre-treatment temperatures (200°C and above) led to reduced biogas production due to inhibitory compounds. This study demonstrates the effectiveness of hydrothermal pre-treatment as a low-temperature, green technology for enhancing OPEFB-based biogas production, contributing to Malaysia's renewable energy goals. Future research should focus on scale-up and validation of this integrated process.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":"112 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141126730","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

Feasibility of Electric Fishing Boats based on Evaluation of Hydrostatic Forces and Resistance 根据静水压力和阻力评估电动渔船的可行性

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-04 DOI: 10.37934/arfmts.116.2.7587

Ahmad Ilham Ramadhani

{"title":"Feasibility of Electric Fishing Boats based on Evaluation of Hydrostatic Forces and Resistance","authors":"Ahmad Ilham Ramadhani","doi":"10.37934/arfmts.116.2.7587","DOIUrl":"https://doi.org/10.37934/arfmts.116.2.7587","url":null,"abstract":"Conventional gasoline engine fishing boats have several disadvantages, such as high exhaust emissions, high fuel consumption, and low service life. The disadvantages of the gasoline engine can be resolved by using the electrical engine. Electrical fishing boats is an improvement on conventional boat to reduce the fuel consumption and emissions. In realizing an electric fishing boat, a feasibility analysis of the design, shape and weight that can be accommodated is required. The feasibility of an electric fishing boat has been successfully carried out by simulating the boat on Maxsurf Software. The aim of this research is to analyze feasibility of conventional boats by designing electric fishing boats. Improving feasibility is carried out by calculating hydrostatic forces and resistance. Electric fishing boats design using the simulation model in Maxsurf Modeller and simulation of resistance in Maxsurf Resistance at speeds of 1, 3 and 5 knots, with Wyman method. The modeling results show that the electric fishing boat design has a pointed front configuration with a V-shaped bottom. Main dimensions LoA 3.49 m, width 0.8 m; height 0.5 m; and a draft of 0.2 m, the boat produces a hydrostatic force which includes a displacement of 301.5 kg, a midship draft and submerged area of 0.2 m, a wet area of 3.08 m2, and a waterline of 0.5 – 1.5 m. Testing 1, 3, and 5 knots, the boat experienced resistance of 26.11 N, 234.96 N, and 652.73 N respectively. The power required for the boat to operate was 13,43 W, 362.66 W, and 1678,97 W. The feasibility of designing an electric fishing boat is the main key to developing an electric fishing boat.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":"129 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141013153","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

Unsteady Flow of Hybrid Nanofluids Subjected to a Stretching/Shrinking Sheet with Heat Generation 受拉伸/收缩片影响的混合纳米流体的非稳态流动与热量产生

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-04 DOI: 10.37934/arfmts.116.2.5974

Noorina Abdul Rahman, Najiyah Safwa Khashi’ie, Iskandar Waini, Khairum Hamzah, Mohd Afzanizam Mohd Rosli, Ioan Pop

{"title":"Unsteady Flow of Hybrid Nanofluids Subjected to a Stretching/Shrinking Sheet with Heat Generation","authors":"Noorina Abdul Rahman, Najiyah Safwa Khashi’ie, Iskandar Waini, Khairum Hamzah, Mohd Afzanizam Mohd Rosli, Ioan Pop","doi":"10.37934/arfmts.116.2.5974","DOIUrl":"https://doi.org/10.37934/arfmts.116.2.5974","url":null,"abstract":"This work highlights the thermal progress and flow characteristics of the various hybrid nanofluids (graphene-alumina/water and copper-alumina/water) flow over a stretching/shrinking sheet with heat generation and suction effects using numerical approach. This study is important in identifying the nanofluids and physical parameters which beneficial in the increment of the flow and thermal progresses. The control model (partial differential equations) is established based on the boundary layer assumptions and then transformed into a set of ordinary (similar) differential equations. A numerical solver in the MATLAB software called the bvp4c solver is used to compute the solutions by first transforming the reduced ODEs. There is an increase in velocity profile and a decrease in thermal rate with the increased suction parameter. It is observed that between the two hybrid nanofluids, the Cu-Al2O3/H2O hybrid nanofluid has a larger thermal rate and skin friction coefficient compared to the Graphene-Al2O3/H2O, which makes Cu-Al2O3/H2O a good option for the industrial cooling processes.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":"209 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141013415","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 Heat Transfer Enhancement in Tubular Heat Exchanger: An Experimental Investigation with Minijet Impingement 管式热交换器中的创新传热增强技术：利用微型射流冲击的实验研究

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-04 DOI: 10.37934/arfmts.116.2.5158

Shital Yashwant Waware, Sandeep Sadashiv, A. Kurhade, Suhas Prakashrao Patil

{"title":"Innovative Heat Transfer Enhancement in Tubular Heat Exchanger: An Experimental Investigation with Minijet Impingement","authors":"Shital Yashwant Waware, Sandeep Sadashiv, A. Kurhade, Suhas Prakashrao Patil","doi":"10.37934/arfmts.116.2.5158","DOIUrl":"https://doi.org/10.37934/arfmts.116.2.5158","url":null,"abstract":"This paper investigates heat transfer in a horizontally oriented tubular heat exchanger through a comprehensive examination of both numerical simulations and experimental analyses. The primary focus is on copper as the material of interest, specifically examining an inner tube with a 14 mm internal diameter and 1 mm thickness, as well as an outer tube with a 29 mm external diameter and 1 mm thickness. In addition to these components, two perforated pipes with internal diameters of 11 mm and 20 mm are incorporated; contributing to an overall length of the heat exchanger measuring 281 mm. Notably, the perforation pipe features a 5 mm diameter hole on its periphery. A comprehensive assessment was conducted to appraise heat transfer and coefficients within a straightforward tubular heat exchanger. The mass flow rate of chilled water in the annular space fluctuated between 0.01 kg/sec and 0.11 kg/sec, while the steady flow rate of hot water within the inner tube remained constant at 0.11 kg/sec. Inlet temperatures for the hot water were established at 55 °C, 75 °C, and 85 °C, with the cold water maintaining a consistent inlet temperature of 29 °C throughout the experiment.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":"8 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141014520","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

Performance Analysis of a Crossflow Vortex Turbine for a Gravitational Water Vortex Power Plant 用于重力水涡流发电厂的横流涡轮性能分析

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-04 DOI: 10.37934/arfmts.116.2.1326

Abel Alfeuz, Fadzlita Tamiri, Farm Yan Yan, Wan Khairul Muzammil, Melvin Gan Jet Hong, Dayang Salyani Abang Mahmod, Nuramalina Bohari, Mohd Azlan Ismail

{"title":"Performance Analysis of a Crossflow Vortex Turbine for a Gravitational Water Vortex Power Plant","authors":"Abel Alfeuz, Fadzlita Tamiri, Farm Yan Yan, Wan Khairul Muzammil, Melvin Gan Jet Hong, Dayang Salyani Abang Mahmod, Nuramalina Bohari, Mohd Azlan Ismail","doi":"10.37934/arfmts.116.2.1326","DOIUrl":"https://doi.org/10.37934/arfmts.116.2.1326","url":null,"abstract":"The micro hydro system is the most favorable renewable energy source to supply electricity for rural areas. The Gravitational Water Vortex Power Plant (GWVPP) is one of the micro hydro systems that is suitable for very low-head hydropower sites. GWVPP consists of three major parts: electromechanical components, civil structures, and electric distribution. The micro hydro turbine in GWVPP is called a vortex hydro turbine and is used to convert induced vortex flow to mechanical energy coupled with a generator to produce electricity. This paper investigates crossflow vortex turbine performance using Computational Fluid Dynamics (CFD) software and experimental work. The CFD results provide qualitative and quantitative comprising velocity distribution, water vortex profile, and water vortex height. The optimum hydraulic performance in the water vortex was observed and determined for different turbine positions. The vortex crossflow turbine was placed 0.05 m from the bottom surface of the basin at the highest vortex tangential velocity. A 0.05 m turbine position was chosen for the turbine installations as it creates a high-velocity profile. The comparative performance was conducted on the vortex crossflow blade with different inlet blade angle designs at a range of 400 – 700. The experimental analysis was conducted at rotational speeds of 30 rpm – 70 rpm to determine its efficiency performance. The optimum design for the crossflow blade was at 500 with an operational speed of 50 rpm, which exhibited torque and power output at 0.27±0.02 m and 1.49±0.08 m respectively with an efficiency recorded at 18.98%.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":"212 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141013071","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

Safe Energy using Hydraulic System Analysis at a Hydropower Plant 利用水电站水力系统分析实现安全能源

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-04 DOI: 10.37934/arfmts.116.2.131143

Wadhah Hussein Abdulrazzaq Al Doori, Ali Mohammed Hussien

引用次数: 0

The Effect of Insulation Thickness on Heat Transfer Characteristics and Flammability in Tube Mesoscale Combustors 隔热层厚度对管式中尺度燃烧器传热特性和可燃性的影响

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-04 DOI: 10.37934/arfmts.116.2.157171

Evita Leninda Fahriza Ayuni, Andinusa Rahmandhika, Daryono, Ardi Lesmawanto, Krisna Bayu Rizkyawan, Ali Mokhtar, Achmad Fauzan Hery Soegiharto

{"title":"The Effect of Insulation Thickness on Heat Transfer Characteristics and Flammability in Tube Mesoscale Combustors","authors":"Evita Leninda Fahriza Ayuni, Andinusa Rahmandhika, Daryono, Ardi Lesmawanto, Krisna Bayu Rizkyawan, Ali Mokhtar, Achmad Fauzan Hery Soegiharto","doi":"10.37934/arfmts.116.2.157171","DOIUrl":"https://doi.org/10.37934/arfmts.116.2.157171","url":null,"abstract":"Micropower generator is a micro-scale energy source that has two main components, namely a micro/mesoscale combustor and thermophotovoltaics (TPV). The micro-scale combustor is one part that functions as a combustion chamber that produces heat in micropower plants. Heptane is used as fuel, while the combustor combustion chamber with a diameter of 3.5 mm is made from duraluminium-quart glass tube. Combustion stability in the combustion chamber is influenced by several factors, such as temperature, geometry, and combustion chamber design. In order to maintain flame stability, mesh is added to the combustion chamber. One way to minimize heat loss in the combustion chamber is to add an insulating layer to the combustion chamber. This research aims to prove the role of adding an insulating layer in flame stability in mesoscale burners. It is necessary to add an appropriate insulating layer to minimize heat loss so that it remains stable in the mesoscale burner. This experimental test shows that the temperature distribution when adding an insulation layer with a thickness of 3 mm has a higher temperature on the outside compared to a thickness of 6 mm. Meanwhile, the temperature inside the combustor chamber with a thickness of 6 mm is superior to that with a thickness of 3 mm. The flame limit of the combustor with a mesh distance of 5 mm for liquid heptane fuel was successfully stable at an equivalent ratio of ɸ0.97 – 1.5 with a maximum speed of 31.7.","PeriodicalId":37460,"journal":{"name":"Journal of Advanced Research in Fluid Mechanics and Thermal Sciences","volume":"44 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141014005","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

Extended Eddy-Viscosity Model to Rayleigh-Benard Convection in Cavity 腔体内瑞利-贝纳德对流的扩展涡粘模型

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-04 DOI: 10.37934/arfmts.116.2.102111

Gunarjo Suryanto Budi, Sasa Kenjeres

引用次数: 0

Stretched Meshing in a 2D Computational Domain with Elbow Edges for CFD Applications 二维计算域中的拉伸网格与 CFD 应用中的肘部边缘

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-05-04 DOI: 10.37934/arfmts.116.2.4150

Gancang Saroja, Sugeng Rianto, Abdurrouf, S. P. Sakti, M. Nurhuda

引用次数: 0