scholarly journals UNJUK KERJA TURBIN CROSS-FLOW DENGAN SIMULASI CFD PADA NOSEL DAN MANUFAKTUR PADA RUNNER

2021 ◽  
Vol 5 (2) ◽  
pp. 443
Author(s):  
Steven Darmawan ◽  
Abrar Riza ◽  
M. Sobron Y. Lubis ◽  
Stevanus Aditya Winardi ◽  
Reuben Christianto
Keyword(s):  
Renewable Energy ◽  
Energy Demand ◽  
Cfd Simulation ◽  
Mechanical Energy ◽  
Cross Flow ◽  
Cnc Machining ◽  
Working Fluid ◽  
Wide Range ◽  
The Cross ◽  
Ss 304

Covid-19 pandemic has lead disruption in energy sector, new-and-renewable energy demand is increasing, which show that renewable energy is promisable to be developed.  As one of the hydraulic turbine, the cross-flow turbine is prospective primve mover in line with the 7th goal of the SDG’s Goals. Cross-flow turbine is radial atmospheric turbine which generates power by converting hydraulic energy from water to mechanical energy on the shaft by using nozzle and runner. The advantages make this device is became famous, including simple construction and geometry, low maintenance & cost and can be used at wide range operation scheme. However, the cross-flow turbine system is also known to have low efficiency. Based on this condition, this research is aims to improve the efficiency with design the nozzle and to manufacture the runner with two material. The operating condition is set to 1 phase water as working fluid with 1,4 L/s of flow. Nozzle design conducted with CFD 3D simulation from 3 different model. Runner manufacturing is conducted numerically with CAM simulation and experimentally by using CNC machining with Stainless Stell 304 and Aluminium 6061. CFD simulation on the nozzle shows that nozzle model 3 with total length of 400 mm, width 124 mm and throat radius 75 mm.resulting the maximum outlet velocity to the runner 0,135 m/s. Manufacturing of the runner and experiment on the system with nozzle model 3 show that the runner with SS 304 is able to generates larger power to 8,38 Watt,100% larger than the Aluminium 6061.Keywords: Renewable Energy, Cross-flow turbine, CFD, CAMAbstrakPandemi Covid-19 mengakibatkan disrupsi pada sektor energi, dimana konsumsi energi baru dan terbarukan mengalami kenaikan. Fenomena ini menunjukkan bahwa energi terbarukan menjanjikan untuk terus dikembangkan. Sesuai dengan goal ke-7 dari SDG’s oleh PBB, turbin cross-flow merupakan turbin radial yang menghasilkan daya melalui konversi energi hidrolik dari air sebagai sumber energi terbarukan, menjadi energi mekanis pada poros melalui penggunaan nosel dan runner, banyak digunakan karena beberapa kelebihannya, antara lain konstruksi yang sederhana dan simetris hanya memerlukan biaya perawatan yang rendah dan sederhana serta dapat digunakan pada rentang beban yang cukup besar. Namun demikian, turbin cross-flow secara umum memiliki nilai efisiensi yang lebih rendah. Efisiensi sistem dapat ditingkatkan dengan penggunaan material runner yang seusai. Penelitian ini bertujuan untuk melakukan perancangan terhadap nosel dan proses manufaktur runner cross-flow sehingga dapat diperoleh geometri nosel serta jenis material dan proses manufaktur runner yang sesuai untuk rentang operasi, yaitu aliran air 1 fasa dengan debit 1,4 L/s. Pengembangan nosel dilakukan dengan menggunakan metode CFD pada 3 model geometri. Pengembangan terhadap runner meliputi simulasi CAM dan manufaktur pada 2 jenis material, yaitu SS 304 dan Aluminium 6061. Hasil simulasi CFD 3D menunjukkan bahwa nosel model 3 dengan dimensi panjang total 400mm, lebar 124 mm, dan radius pada throat 75mm menghasilkan kecepatan pada sisi outlet sebesar 0,135 m/s. Hasil simulasi CAM dan Manufaktur terhadap runner serta eksperimen terhadap sistem dengan nosel model 3 menunjukkan bahwa bahwa runner dengan material SS 304 menghasilkan daya, yaitu 8.38 Watt, 100% lebih besar dibandingkan dengan runner dengan material Aluminium 6061.

scholarly journals Investigation of flow non-uniformities in the cross-flow heat exchanger with elliptical tubes

2019 ◽  
Vol 108 ◽  
pp. 01009 ◽  
Author(s):  
Stanisław Łopata ◽  
Paweł Ocłoń ◽  
Tomasz Stelmach
Keyword(s):  
Heat Exchanger ◽  
Measurement Data ◽  
Cross Flow ◽  
Flow Distribution ◽  
Transitional Flow ◽  
Working Fluid ◽  
Elliptical Cross ◽  
Flow Heat ◽  
The Cross ◽  
Inflow Conditions

In heat exchangers, especially those with the cross-flow arrangement, it is nearly impossible to achieve the uniform distribution of the working fluid in the tubular space with the currently used inlet and outlet chambers (in some constructions as well). The improper inflow conditions to individual tubes, including those with an elliptical cross-section - often used because of their favorable features compared to round tubes, is the cause of improper heat transfer. In this respect, transitional flow is of particular importance. This flow regime is complex and challenging to model. Therefore, it is necessary to perform experimental verification. For this purpose, an appropriate stand was built, allowing to investigate the flow of the working fluid (water) to the elliptical tubes in the cross-current heat exchanger. The paper presents the results of measurements for manifold geometry, which are currently used in practice (for heat exchanger constructions). The analysis of the measurement data confirms the nonuniform flow distribution to individual tubes of the heat exchanger.

Influence of operational parameters on performance of twin thermoacoustic prime mover – CFD studies

2016 ◽  
Vol 33 (3) ◽  
Author(s):  
Jabbar P ◽  
Hariharan N.M ◽  
Palani Sivashanmugam ◽  
S. Kasthurirengan
Keyword(s):  
Temperature Gradient ◽  
Design Methodology ◽  
Cfd Simulation ◽  
Working Fluid ◽  
Geometrical Parameters ◽  
Pressure Amplitude ◽  
Prime Mover ◽  
Operational Parameters ◽  
Fluid Medium ◽  
Wide Range

Purpose The present investigation deals with the analysis of the performance of twin thermoacoustic prime mover (TAPM) which are measured in terms of frequency and pressure amplitude by varying the parameters such as temperature gradient along the length of stack and the operating pressures of fluid medium argon using CFD simulation. With the help of CFD researchers and Engineers can evaluate the performance of a wide range of thermoacoustic systems on the computer without the time, expense, and disruption required to make actual changes onsite (stack) which is tedious to fabricate. Design/methodology/approach For the present simulation, the operating pressures of argon such as 1bar, 3bar and 5bar, and the temperature gradient is varied from 600K to 1400K with the regular intervals of each 200K. The geometry of twin TAPM is created using GAMBIT processor, and the simulation is carried out using FLUENT. The geometrical parameters of twin TAPM are kept constant throughout the simulation. The results for frequency and pressure amplitude obtained from the CFD simulation of twin TAPM for various temperature gradient and operating pressures are analysed and reported. Findings The computational results of twin thermoacoustic prime mover shows an increase in pressure amplitude with an increase in the temperature gradient and also it increases with an increase in operating pressures of the fluid medium. The parameter operating pressures of the working fluid medium and the stack hot end temperature has no significant effect on the output, frequency. Originality/value Though several experimental works had been published based on the twin thermoacoustic prime mover, an attempt has been made in the present investigation for the first time to estimate the performance of twin thermoacoustic prime mover using CFD package (ANSYS-FLUENT) by varying temperature gradient. The temperature gradient and operating pressures were varied and the performance of twin thermoacoustic prime mover was measured in terms of frequency and pressure amplitude.

scholarly journals Sustainable Energy: Challenges of Implementing New Technologies

2021 ◽  
pp. 8-24
Author(s):  
Abdeen Mustafa Omer
Keyword(s):  
Renewable Energy ◽  
Rural Areas ◽  
Energy Demand ◽  
New Technologies ◽  
Regional Distribution ◽  
Petroleum Products ◽  
Biomass Energy ◽  
Low Carbon ◽  
Wide Range ◽  
Distribution Energy

Sudan is an agricultural country with fertile land, plenty of water resources, livestock, forestry resources, and agricultural residues. Energy is one of the key factors for the development of national economies in Sudan. An overview of the energy situation in Sudan is introduced with reference to the end uses and regional distribution. Energy sources are divided into two main types; conventional energy (biomass, petroleum products, and electricity); and non-conventional energy (solar, wind, hydro, etc.). Sudan possesses a relatively high abundance of sunshine, solar radiation, and moderate wind speeds, hydro, and biomass energy resources. Application of new and renewable sources of energy available in Sudan is now a major issue in the future energy strategic planning for the alternative to the fossil conventional energy to provide part of the local energy demand. Sudan is an important case study in the context of renewable energy. It has a long history of meeting its energy needs through renewables. Sudan’s renewables portfolio is broad and diverse, due in part to the country’s wide range of climates and landscapes. Like many of the African leaders in renewable energy utilisation, Sudan has a well-defined commitment to continue research, development, and implementation of new technologies. Sustainable low-carbon energy scenarios for the new century emphasise the untapped potential of renewable resources. Rural areas of Sudan can benefit from this transition. The increased availability of reliable and efficient energy services stimulates new development alternatives. It is concluded that renewable environmentally friendly energy must be encouraged, promoted, implemented, and demonstrated by full-scale plant especially for use in remote rural areas.

Computational Fluid Dynamics (CFD) Simulation of Cross-flow Mode Operation of Membrane for Downstream Processing

2019 ◽  
Vol 13 (1) ◽  
pp. 57-68 ◽  
Author(s):  
Anirban Banik ◽  
Tarun Kanti Bandyopadhyay ◽  
Sushant Kumar Biswal
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Membrane Filtration ◽  
Cfd Simulation ◽  
Cross Flow ◽  
Flow Mode ◽  
Computational Fluid Dynamics Cfd ◽  
The Cross ◽  
Fluent 6.3

Background: Membrane filtration process produced good quality of permeate flux due to which it is used in different industries like dairy, pharmaceutical, sugar, starch and sweetener industry, bioseparation, purification of biomedical materials, and downstream polishing etc. The cross-flow mode of operation has also been used to improve the quality of the Rubber Industrial effluent of Tripura, India. </P><P> Method: The Computational Fluid Dynamics (CFD) simulation of the cross-flow membrane is done by using ANSYS Fluent 6.3. The meshing of the geometry of the membrane is done by Gambit 2.4.6 and a grid size of 100674, the number of faces is 151651 and number of nodes being 50978 has been selected for the simulation purpose from the grid independence test. We have revised and included all patents in the manuscripts related to the membrane filtration unit. </P><P> Results: Single phase Pressure-Velocity coupled Simple Algorithm and laminar model is used for the simulation of the developed model and Fluent 6.3 used for the prediction of pressure, pressure drop, flow phenomena, wall shear stress and shear strain rate inside the module is studied for cross flow membrane. </P><P> Conclusion: From the study, it has been found that CFD simulated results hold good agreement with the experimental values.

A Review on the Use of Hybrid Nanofluid in a Solar Flat Plate and Parabolic Trough Collectors and Its Enhanced Collector Thermal Efficiency

2021 ◽  
Vol 10 (2) ◽  
pp. 147-171
Author(s):  
L. Syam Sundar ◽  
Solomon Mesfin ◽  
Yihun Tefera Sintie ◽  
V. Punnaiah ◽  
Ali J. Chamkha ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Flat Plate ◽  
Thermal Efficiency ◽  
Energy Demand ◽  
Fossil Fuel ◽  
Working Fluid ◽  
Solar Collectors ◽  
The World ◽  
Hybrid Nanofluids ◽  
Flat Plate Collector

Energy demand is high in all parts of the world, mostly in all industrial sectors. To meet the energy demand the fossil fuel is the only way. Due to rapid industrial growth and use of fossil fuel result in global warming and environmental pollution. Moreover, the limited availability of the fossil fuels, it is necessary to depend on the renewable energy sources. Promising renewable energy in the world is solar energy, which is available largely on the earth surface. The solar energy can be converted into thermal energy in the solar flat plate collector. The collector thermal efficiency is purely depends on the working fluid used in it. Most of the studies revealed that replacing the working fluid with high thermal conductivity fluids called as nanofluids and hybrid nanofluids can improve the collector thermal efficiency. Few decades back studies have been conducted with nanofluids in solar collectors. Currently the researchers are working on solar collectors for further improvement of its efficiency using hybrid nanofluids. In this review paper, we will discuss about the synthesis of hybrid nanoparticles, hybrid nanofluids, characterization, thermophysical properties, and application of hybrid nanofluids in solar flat plate collector under natural and forced circulation of fluid. The research gap in the solar collector is also discussed in this article. This paper also explains about the heat transfer capabilities of hybrid nanofluids especially used solar collectors.

scholarly journals Simulation of Supercritical CO2 Flow Through Circular and Annular Orifice

2015 ◽  
Vol 1 (2) ◽  
Author(s):  
Haomin Yuan ◽  
John Edlebeck ◽  
Mathew Wolf ◽  
Mark Anderson ◽  
Michael Corradini ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
High Efficiency ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Working Fluid ◽  
Operating Pressure ◽  
Two Phase ◽  
Choked Flow ◽  
Wide Range ◽  
Co2 Flow

Supercritical CO2 (sCO2) is a promising working fluid for future high-efficiency power conversion cycles. In order to develop these cycles, it is necessary to understand supercritical and two-phase CO2 flow. This paper presents a methodology for the computational fluid dynamic (CFD) simulation of sCO2 flowing through a restriction under a wide range of flow conditions. Under an accidental situation, such as a pipe break, the inventory of sCO2 leaks out through a small restriction. In this research, we use circular and annular orifices to mimic the behavior of restrictions. As the atmospheric pressure is much smaller than the operating pressure in the pipe, a two-phase choked flow will happen. Such behavior is considered in the simulation. The homogeneous equilibrium model (HEM) is employed to model the two-phase state. To correctly simulate the behavior of the power cycle under this accidental scenario, the inventory leakage rate should be calculated precisely. Therefore, at the current state, this study only focuses on the prediction of mass flow rate through orifices.

Stirling Engines Powered by Renewable Energy Sources

2016 ◽  
Vol 831 ◽  
pp. 263-269
Author(s):  
Jacek Kropiwnicki ◽  
Aleksandra Szewczyk
Keyword(s):  
Renewable Energy ◽  
Low Temperature ◽  
Electric Power ◽  
Mechanical Energy ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Stirling Engine ◽  
Working Fluid ◽  
Energy Sources ◽  
Stirling Engines

Stirling engine is a device that produces mechanical energy using heat from any source of energy, without the need of combustion of any fuel inside the device. Renewable energy sources, which are mostly low-temperature energy sources, can be used to produce mechanical and electrical energy in Stirling engines. The paper presents an overview of the existing prototype Stirling engines designed for using of low-temperature energy sources, including renewable energy sources. Commercial devices for electric power generation offered for use in home, usually do not exceed 1 kW. Using the Schmidt model, the analyze of influence of temperature working fluid in the expansion space (heater) on the efficiency and the electric power generated in the Stirling engine of alpha type has been presented in the paper.

Sustainable Development of Green Energy Technologies in the Republic of Sudan

Green ◽  
2011 ◽  
Vol 1 (4) ◽  
Author(s):  
Abdeen Mustafa Omer
Keyword(s):  
Renewable Energy ◽  
Wind Energy ◽  
Rural Areas ◽  
Energy Demand ◽  
New Technologies ◽  
Renewable Energy Sources ◽  
Regional Distribution ◽  
Green Energy ◽  
Energy Sources ◽  
Wide Range

AbstractSudan is an agricultural country with fertile soil and ample water resources, as well as livestock and forestry resources, and agricultural residues. Energy is one of the key factors in the development of Sudan's national economy. We present an overview of the energy situation in Sudan, with reference to its end uses and its regional distribution. We separate energy sources into two main types: conventional energy (biomass, petroleum products, and electricity) and non-conventional energy (solar power, wind energy, hydro-electric, etc.). Sudan has a relatively high abundance of sunshine and solar radiation, and has moderate biomass, hydro-electric and wind energy resources. Exploiting the available new and renewable energy sources to provide part of the local energy demand, as alternatives to conventional fossil energy, has become a major issue in Sudan's strategic planning of future energy policies. Sudan presents an important case study with respect to renewable energy, as it has a long history of meeting its energy needs by use of renewable sources; Sudan's portfolio is broad and diverse, due in part to the country's wide range of climates and landscapes. Like many African frontrunners in the utilisation of renewable energy, Sudan has a well-defined commitment to continue research, development, and implementation of new technologies. Sustainable low-carbon energy scenarios in the new century emphasize the importance of exploiting the untapped potential of renewable resources. Sudan's rural areas in particular, can benefit from this transition. The increased availability of reliable and efficient energy services will stimulate the development of new alternatives. We conclude that using renewable, environmentally friendly energy must be encouraged, promoted, implemented, and demonstrated by full-scale energy plants or collection devices, in particular for use in remote rural areas.

scholarly journals CFD Simulation of Dry Pressure Drop in a Cross-Flow Rotating Packed Bed

2021 ◽  
Vol 11 (21) ◽  
pp. 10099
Author(s):  
Chao Zhang ◽  
Weizhou Jiao ◽  
Youzhi Liu ◽  
Guisheng Qi ◽  
Zhiguo Yuan ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Gas Flow ◽  
Cfd Simulation ◽  
Complex Structure ◽  
Scale Up ◽  
Cross Flow ◽  
Packed Bed ◽  
Rotating Packed Bed ◽  
Porous Media Model ◽  
The Cross

The cross-flow rotating packed bed (RPB) has attracted wide attention in recent years because of its advantages of large gas capacity, low pressure drop and lack of flooding limitation. However, the complex structure of the packing makes it difficult to obtain the gas flow characteristics in the cross-flow RPB by experiments. In this study, the dry pressure drop in the cross-flow RPB was investigated by computational fluid dynamics (CFD). The packing was modeled by the porous media model and the rotation of the packing was simulated by the sliding mesh model. The simulation results obtained by three turbulence models were compared with experimental results, and the RNG k-ε model was found to best describe the turbulence behaviors in the cross-flow RPB. Then, the effects of gas flow rate and rotating speed on dry pressure drop in different parts of the cross-flow RPB were analyzed. The results of this study can provide important insights into the design and scale-up of cross-flow RPB.

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