CFD Letters最新文献_第8页

The Development of Hybrid Cooling Photovoltaic Panel by using Active and Passive Cooling System 利用主动和被动冷却系统开发混合冷却光伏电池板

CFD Letters Pub Date : 2024-01-11 DOI: 10.37934/cfdl.16.5.107120

Irwan Yusoff, Swee Yi Jun, Mohd Hafizuddin Mat, Muhammad Irwanto Misrun, Leow Wai Zhe, Safwati Ibrahim, Nurul Husna Abd Wahab

{"title":"The Development of Hybrid Cooling Photovoltaic Panel by using Active and Passive Cooling System","authors":"Irwan Yusoff, Swee Yi Jun, Mohd Hafizuddin Mat, Muhammad Irwanto Misrun, Leow Wai Zhe, Safwati Ibrahim, Nurul Husna Abd Wahab","doi":"10.37934/cfdl.16.5.107120","DOIUrl":"https://doi.org/10.37934/cfdl.16.5.107120","url":null,"abstract":"Photovoltaic (PV) panel are crucial in the conversion of solar irradiance into electrical energy. However, the efficiency of PV panel is indirectly influenced by the surface temperature of the panels. According to typical PV module standards, the effect of panel temperature on efficiency is -0.47 %/°C, which indicates that a rise of 1°C reduces the PV panel's efficiency by 0.47 %. The efficiency of the PV panel achieves its maximum value when the panel temperature reaches 25 ℃, which is the standard test condition (STC). Moreover, a high working temperature can also reduce the lifetime of the PV panel. Based on the limitations that have been highlighted above, this project aims to design and develop a hybrid cooling PV panel by using active and passive cooling system with Arduino UNO R3. In this project, 100 W monocrystalline photovoltaic panel has been selected to analyze the result before and after installation of hybrid cooling system. Active cooling system is a water sprinkler system which is applied in front of the PV panel. Meanwhile, the passive cooling system is a combination of hydrogel beads and the heat-sink cooling system which will be installed behind the PV panel. In result, the average power output of PV panel without cooling was 30.59 W while the average power output of PV panel with hybrid cooling was 34.66 W. Moreover, the average power increased due to cooling was 13.31 %. In a nutshell, the proposed project has the ability to develop a hybrid cooling system to improve the performance and efficiency of the PV panel in order to increase the power output of the panel.","PeriodicalId":9736,"journal":{"name":"CFD Letters","volume":"44 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139533742","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

Dufour and Soret Influence on MHD of an Oldroyd-B Fluid over a Stretching Sheet with Nanoparticles 杜富尔和索雷特对带有纳米颗粒的拉伸片上奥尔德罗伊德-B 流体 MHD 的影响

CFD Letters Pub Date : 2024-01-11 DOI: 10.37934/cfdl.16.5.91106

abdelmgid sidahmed

引用次数: 0

Three-dimensional MHD Mixed Convention Upper Convective Flow of Maxwell Fluid Throughout the Past in Thermophoresis and Brownian Motion with the Effects of Diffusion Thermo and Thermal Diffusion Utilizing Nonlinear Radiative Heat Flux 麦克斯韦流体在热泳和布朗运动中的三维 MHD 混合公约上对流，以及利用非线性辐射热通量的热扩散和热扩散效应

CFD Letters Pub Date : 2024-01-11 DOI: 10.37934/cfdl.16.5.135153

Rameswara Reddy Yeddula, Srinivasan Donti Ratnam

{"title":"Three-dimensional MHD Mixed Convention Upper Convective Flow of Maxwell Fluid Throughout the Past in Thermophoresis and Brownian Motion with the Effects of Diffusion Thermo and Thermal Diffusion Utilizing Nonlinear Radiative Heat Flux","authors":"Rameswara Reddy Yeddula, Srinivasan Donti Ratnam","doi":"10.37934/cfdl.16.5.135153","DOIUrl":"https://doi.org/10.37934/cfdl.16.5.135153","url":null,"abstract":"This article aims to investigate the impact of nanoparticles and magnetohydrodynamics (MHD) on the transfer of heat and mass using a three-dimensional upper-convected Maxwell (UCM) nanofluid flow across a stretched surface. A nonlinear radiative heat flow was included in formulating the equation that describes energy. The nonlinear partial differential equations of the issue are transformed into ordinary differential equations utilizing the similarity transformation. These equations are then solved using the well-known shooting approach in conjunction with the Runge-Kutta integration process of order four. To increase the dependability of our findings make use of the MATLAB. On the velocities, temperatures, and concentrations of the particles, the graphical and numerical representations of the effects of the main parameters, such as the Dufour parameter, the Brownian motion parameter, the Prandtl number, the thermophoresis parameter, and the magnetic parameter, are presented. It has been shown that the flow velocity decreases as a function of both the linear and nonlinear thermal radiation parameters. In addition, increasing values of the Brownian motion parameter have the effect of reducing the nanoparticle concentration profile, the same behavior has observed in the case of thermal diffusion and Diffusion thermo parameters.","PeriodicalId":9736,"journal":{"name":"CFD Letters","volume":" 0","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139625359","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

Aerodynamic Characteristics of Forward Swept Wing in Subsonic Speed 前掠翼在亚音速下的空气动力特性

CFD Letters Pub Date : 2024-01-11 DOI: 10.37934/cfdl.16.5.18

Choosak Ngaongam, Rapee Ujjin

{"title":"Aerodynamic Characteristics of Forward Swept Wing in Subsonic Speed","authors":"Choosak Ngaongam, Rapee Ujjin","doi":"10.37934/cfdl.16.5.18","DOIUrl":"https://doi.org/10.37934/cfdl.16.5.18","url":null,"abstract":"A forward swept wing was designed to use for a supersonic aircraft. Its aerodynamic characteristics were studied through experiments and numerical simulations which excluded the subsonic speed condition. For this paper aims to explore the aerodynamic characteristics of the forward swept wing in the range of subsonic speed by using a computational fluid dynamics method. In simulation, the airfoil shape of the wing model was NACA 3412. It was varied in both swept angle and angle of attack. The airspeed was given constant at 50 m/s. The simulation results indicate that the forward swept wing model is suitable for the aerobatic aircraft because lift coefficient and the stall angle of the forward swept wing model is higher than the non-swept wing model. Moreover, the aerodynamic stall of the forward swept wing occurs at the wing root which makes the aircraft able to maintain the controllability of the aileron surface at high angle of attack. However, the aircraft with forward swept wing model tends to consume more energy as compared with non-swept wing model. Because the maximum lift to drag ratio of the forward swept wing is less than the non-swept wing. Non-swept wing model has the maximum lift to drag ratio of 8.76 at the angle of attack 2°. While the forward swept wing 35° provides the maximum lift to drag ratio of 7.47 at the angle of attack 6°.","PeriodicalId":9736,"journal":{"name":"CFD Letters","volume":" 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139625941","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

Heat and Mass Transfer Significance on MHD Flow over a Vertical Porous Plate in the Presence of Chemical Reaction and Heat Generation 热量和质量传递对存在化学反应和热量生成的垂直多孔板上 MHD 流动的影响

CFD Letters Pub Date : 2024-01-11 DOI: 10.37934/cfdl.16.5.920

Vasa Vijaya Kumar, Mamidi Narsimha Raja Shekar, B Shankar Goud

引用次数: 0

CFD Analysis on the Development of Pre-Duct Shape to Improve Propeller Performance 为提高螺旋桨性能而开发预导管形状的 CFD 分析

CFD Letters Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.118132

Munazid Ali, Ariana I Made, Utama I Ketut Aria Pria

{"title":"CFD Analysis on the Development of Pre-Duct Shape to Improve Propeller Performance","authors":"Munazid Ali, Ariana I Made, Utama I Ketut Aria Pria","doi":"10.37934/cfdl.16.2.118132","DOIUrl":"https://doi.org/10.37934/cfdl.16.2.118132","url":null,"abstract":"Energy saving contributions of Energy Saving Device (ESD) Pre-Duct are reducing energy losses and separation at the stern, increasing the ideal propeller efficiency, increasing the capture of viscous wake that passes through the propeller disk, and increasing the interaction of the propeller and ship hull. The effect of ESD Pre-Duct in front of the propeller on saving of energy is influenced by the accuracy and suitability of the geometry, position, and shape of pre-duct. In this study, the shape of the asymmetric un-circular pre-duct was develop and analysis conducted by compared the effect of the shape of pre-duct on the performance of propeller, the shape of pre-duct: circular (conventional), un-circular, and asymmetric un-circular. Computational Fluid Dynamics (CFD) modelling results using the ANSYS CFX software package with Propeller Open Water (POW) test simulations show that the installation of pre-ducts with several shape developments in general has a significant effect on increasing propeller performance at low propeller rotation speeds, whereas on high propeller rotation even though there is an increase in propeller performance but not significant.","PeriodicalId":9736,"journal":{"name":"CFD Letters","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139198885","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 Dimple Effect on Flettner Rotors for the Wind Power Drive System of a Sailing Merchant Ship 风帆商船风能驱动系统 Flettner 转子上的凹痕效应

CFD Letters Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.7690

aries sulisetyono, Aditya Bagaskara

{"title":"The Dimple Effect on Flettner Rotors for the Wind Power Drive System of a Sailing Merchant Ship","authors":"aries sulisetyono, Aditya Bagaskara","doi":"10.37934/cfdl.16.2.7690","DOIUrl":"https://doi.org/10.37934/cfdl.16.2.7690","url":null,"abstract":"Wind-powered ship propulsion is investigated in relation to reducing ship exhaust emissions, such as the application of Flettner rotor systems. How to increase rotor thrust's contribution to ship speed is an intriguing research question. This paper investigates the influence of dimples on the surface of a Flettner rotor on its ability to generate thrust for a ship. The CFD code, which includes the Reynolds average Navier-Stokes equation and the k-ω model for turbulent flow, is utilized to analyse three rotor designs: one with a smooth surface and two with dimple surfaces of varying diameters. Lift and drag are computed by taking into account varying spin ratios and the incoming wind angle. The CFD results are validated by comparing them to experimental data gathered in a wind tunnel and determining that their error is less than 5%. The addition of dimpled surfaces to the rotor increases lift by 69.6% and decreases drag by 14.8% due to the smooth surface. For the case study, the two rotors are mounted on the sailing ship 900 DWT and can generate the most thrust to give the ship a speed of 8.5 knots with a spin ratio of 4 and apparent wind angles of 90o or 270o relative to its speed.","PeriodicalId":9736,"journal":{"name":"CFD Letters","volume":"120 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139200908","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 Changing the Water Flow Rate on the Efficiency of Hybrid PV/T Uncovered Collectors without Glasses: Numerical Study 改变水流速度对无玻璃混合光伏/无盖集热器效率的影响：数值研究

CFD Letters Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.91104

Muna Ali Talib, Adel A. Eidan, Ahmed Hasan Tawfeeq, Fatima Muhammed K. AL- Fatlawe

{"title":"Effect of Changing the Water Flow Rate on the Efficiency of Hybrid PV/T Uncovered Collectors without Glasses: Numerical Study","authors":"Muna Ali Talib, Adel A. Eidan, Ahmed Hasan Tawfeeq, Fatima Muhammed K. AL- Fatlawe","doi":"10.37934/cfdl.16.2.91104","DOIUrl":"https://doi.org/10.37934/cfdl.16.2.91104","url":null,"abstract":"The flat-plate collector is one of the most frequent types of collectors because it is simple to manufacture and it is relatively inexpensive in comparison to other collectors. The primary objective of this work is to improve the collector's efficiency, which can be accomplished by increasing the heat transfer quantitatively. This can be accomplished by increasing the efficiency of the collector. In this research employs hybrid photovoltaic panels through electrical generation and, on the other hand, takes advantage of the lost heat, which has reduced efficiency to useful heat, by transporting them through fluid and benefiting from them through industrial and domestic applications. The model was studied numerically by ANSYS computational code, where simulations were carried out on CFD and steady state thermal, as well as the effect of solar radiation, at a value of 10, on the layer of photovoltaic cells. Besides, several values of flow rate (0.02, 0.025, and 0.03) were used and compared. The current findings show that the efficiency of the current panel under consideration increased significantly, and the value of flow of 0.03 was the optimal value that led to obtaining suitable efficiency and a relatively acceptable water temperature.","PeriodicalId":9736,"journal":{"name":"CFD Letters","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139201012","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 in a Lid-Driven Cavity in the Presence of Magnetic Field with Sinusoidal Heating 存在正弦加热磁场的盖驱动型腔中的混合对流

CFD Letters Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.4254

Norhaliza Abu Bakar, Rozaini Roslan, Zul Afiq Sazeli, Nur Raidah Salim

{"title":"Mixed Convection in a Lid-Driven Cavity in the Presence of Magnetic Field with Sinusoidal Heating","authors":"Norhaliza Abu Bakar, Rozaini Roslan, Zul Afiq Sazeli, Nur Raidah Salim","doi":"10.37934/cfdl.16.2.4254","DOIUrl":"https://doi.org/10.37934/cfdl.16.2.4254","url":null,"abstract":"Understanding mixed convection in engineering applications such as heat exchangers, electronics cooling devices, and solar energy collectors have urged researchers to investigate this phenomenon deeper. This study investigates the fluid flow and heat transfer pattern in a two-dimensional (2D) rectangular cavity with sinusoidal heating on the moving top lid numerically. The bottom wall is kept cool while the vertical walls are insulated. The effect of Hartmann number, Ha on the thermal characteristics and fluid flow are analyzed for Richardson number, Ri=1 which indicate mixed convection dominated regime. The governing equations are solved numerically using a SIMPLE algorithm with the finite volume method. The numerical results are displayed in streamlines and isotherms plots. The value of the Nusselt number indicating the heat transfer rate is also discussed. It is found that Ha has a significant effect on the heat transfer process and fluid flow. It can be seen clearly when the value of Ha=30, the rate of heat transfer dropped significantly on the cold wall. Generally, the heat transfer rate decreases with the increase of Ha.","PeriodicalId":9736,"journal":{"name":"CFD Letters","volume":"95 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139196755","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

A Study on Oscillatory Micropolar Flow Beyond a Contaminated Micropolar Fluid Sphere 受污染微极性流体球体外的振荡微极性流研究

CFD Letters Pub Date : 2023-11-30 DOI: 10.37934/cfdl.16.2.133150

Phani Kumar Meduri, Vijaya Lakshmi Kunche

{"title":"A Study on Oscillatory Micropolar Flow Beyond a Contaminated Micropolar Fluid Sphere","authors":"Phani Kumar Meduri, Vijaya Lakshmi Kunche","doi":"10.37934/cfdl.16.2.133150","DOIUrl":"https://doi.org/10.37934/cfdl.16.2.133150","url":null,"abstract":"In this paper, the hypothesis of the axisymmetric rectilinear oscillatory flow beyond a micropolar tainted fluid sphere particle in an incompressible non-Newtonian fluid and also the axisymmetric rectilinear oscillatory flow over a viscous tainted fluid sphere particle in an incompressible Newtonian fluid with small amplitude oscillations have been investigated. The velocity field is exhibited in terms of stream functions, and a slip condition is considered on the boundary. The fluid velocities and microrotation components were derived through analytical procedure. The drag force acting on the particle was also computed and verified for special cases. The real drag and imaginary drag values are numerically extracted for varying slip parameter i.e., 2≤s≤30, micro polarity i.e., 8≤e≤32 , and viscosity ratio i.e., 5≤μ≤20 at a fixed parameter values k=0.1,ρ=0.6,ω=0.6,t=0.6. Graphs and tables are used to display the numerical results. It was observed that there was an inverse proportion between slip parameter values, real drag and direct proportion between slip parameter and imaginary drag, for different viscosity ratio and micro polarity values.","PeriodicalId":9736,"journal":{"name":"CFD Letters","volume":"84 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139199422","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