fluid dynamics Articles
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Managing CFD simulation: reflections around a questionnaire
The topic is Computational Fluid Dynamics (CFD) as a simulation tool within the engineering design process. The engineering design process is considered as a problem-solving process and its focus is on the role of simulation. "Simulation" is defined and a distinction between simulation and analysis is made. Based on a theoretical model of the CFD simulation process and the results from ...
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Irreversibilities reduction of a flow distribution system by means of the EGM methodology
The present work reports the results of an entropy generation analysis on a symmetric flow distributor. The entropy generation minimisation method (EGM) was applied in order to lower the intrinsic irreversibilities associated to the geometric configuration of the flow pattern, aiming to improve the uniformity of flow distribution. 3D Computational Fluid Dynamics (CFD) methods were used to ...
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Second law analysis of a gravity–driven liquid film flowing along an inclined plate subjected to constant wall temperature
The second law analysis of a gravity–driven liquid having temperature–dependent viscosity and flowing along an inclined heated plate was studied. The computational fluid dynamics (CFD) package FLUENT was used to obtain the velocity and temperature gradients, and the results were used to determine the entropy generation rate. Different cases of inclination angle and dimensionless parameters were ...
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Investigation of four geometrical parameters on thermal stratification of cold water tanks by exergy analysis
In this paper, effects of four geometrical parameters of tanks on the thermal stratification within a cold storage tank are analysed. Nine two–dimensional models have been numerically simulated by using the Computational Fluid Dynamics (CFD) program, fluent. Realistic boundary and initial conditions are applied. The level of thermal stratification in each model has been quantified by means of ...
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Application of Computational Fluid Dynamics to flow next to high-rise buildings in Hong Kong due to air-conditioner heat rejection
This paper presents the results of several studies done for high-rise residential buildings in Hong Kong that involved Computational Fluid Dynamics (CFD) simulation. During summer, a number of Window Air-Conditioners (WACs) could be rejecting condenser heat into a recessed space of these high-rise residential buildings. FLUENT 5.0, a CFD code can be used to predict temperatures and flow field of ...
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Environment Friendly Treatment Reduces Scaling up of Sugar Plant Evaporators: Saving Money by Reducing Shutowns
Scaling is one of the biggest problems when it comes to processing sugar but recent experience in Ecuador proves the effectiveness of a totally green technology that reduces evaporator scaling dramatically. As raw materials are processed to make sugar one of the main problems encountered is scaling. The areas affected are different in beet factories to cane factories but both suffer from it. ...
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Irreversibilities reduction of a flow distribution system by means of the EGM methodology
The present work reports the results of an entropy generation analysis on a symmetric flow distributor. The entropy generation minimisation method (EGM) was applied in order to lower the intrinsic irreversibilities associated to the geometric configuration of the flow pattern, aiming to improve the uniformity of flow distribution. 3D Computational Fluid Dynamics (CFD) methods were used to ...
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Case study - Preventing scaling saves expensive pigging operations and production shut downs
UK Based Fluid Dynamics has won a contract to supply its non chemical environment friendly hard water scale prevention products to prevent scaling in an effluent stream. The problem: backwash from iron filters, softeners and RO units combined to block drain lines and cause pumps to seize at a major UK government establishment in Oxfordshire England. The only way to clear these drains was to ...
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Investigation of the performance of single and multi–drop hydraulic structures
In this paper, the work is divided into two parts. First, the hydraulic performance of single and multi–drop structures is investigated and compared using two approaches. In the first approach, the empirical equations found in the literature are summarised and reanalysed to compare the dissipation of energy of single drop and multi–drop structures. The demarcation condition at which multi–drop ...
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Achievement Unlocked: Brian Estep Appointed Vice Chair of ASME’s Thermal Committee
In the modern world, an Engineer must have clear focus, an ability to think critically under pressure, and a willingness to work long hours. When skills are developed over time and knowledge is refined, meaningful innovation can and does come to fruition. However, what allows one to rise above the daily grind to make a positive impact on the Engineering community at large, and bring lasting ...
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Non Chemical Hardwater Scale Prevention System Specified worldwide
Scaling caused by hard water is a major cause of energy wastage as well as providing maintenance problems. Fluid Dynamics is the leading supplier of environment friendly solutions to the problems of hard water scale numbering many of the world’s leading companies among its customer s. Kelloggs, Unilever, Kimberley Clark to name but a few. Increasingly Fluid Dynamics scale preventers are ...
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Case study - US school saves almost $50,000 eliminating water softeners
In Texas, Even though properly maintained, a conventional salt based water softener at Fort Bend ISD (Independent School District) had proven to be ineffective at preventing scale. This resulted in scaling throughout the system particularly in the kitchen / cafeteria area. The main Hobart dishwashing equipment had to be opened up and descaled every week taking up staff time and consuming ...
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Candlewood Suites case study
Customer: Candlewood Suites, San Marcos, TX Category: Commercial: Hotels Application: Whole building protection with Scaletron units The Challenge: The owners of a new 82 room facility were looking for an alternative to the conventional methods that they had been using to prevent scale build up at their other hotels. For example, at a similar sized property $300 to $400 / month was being ...
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A new formula based on computational fluid dynamics for estimating maximum depth of scour by jets from overflow dams
The prediction of the maximum depth of the scour hole formed downstream of overflow dams is critical in determining the safety of hydraulic structures. Most of the conventional formulae are not able to consider complex hydraulic and morphologic conditions. A new formula for estimating the maximum depth of the scour hole based on computational fluid dynamics (CFD), which can be used to simulate ...
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Performance measurement of a twisted three-bladed airfoil-shaped H-rotor
In the present study, performance of a twisted three-bladed airfoilshaped H-rotor was measured experimentally for different values of chord Reynolds number of flow and ratios of height-to-diameter (H/D). The rotor was 20 cm in height (H) and 5 cm in chord with about 26° twist at the trailing end. Tests were conducted in an open circuit subsonic wind tunnel for ten H/D ratios, namely 0.85, ...
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Modelling of atmospheric flow and dispersion in the wake of a cylindrical obstacle
The computational fluid dynamics code ADREA–HF is used to simulate atmospheric dispersion field experiments around an isolated cylindrical obstacle and two upwind sources of ammonia and propane, with the ammonia source located at different lateral positions. Model calculated concentrations and concentration fluctuations are compared with the experimental results, to investigate the effect of the ...
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The computation of the entropy generation rate for turbomachinery design applications: some theoretical remarks and practical examples
The calculation of the entropy generation rate dS/dt in turbomachinery passages is a relatively easy task, once the velocity and temperature fields are known in detail. The global entropy generation rate is directly related to the cascade efficiency, but its functional dependence on the local characteristics of the flowfield is not immediately detectable. On the contrary, knowledge of the local ...
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It is the law (part L building regs) that in hard water areas a scale preventer must be placed before any new boiler installed
Not many people know that .. to coin a famous phrase, but it reflects the increased cost of energy usage arising as a result of scaling caused by hard water. Traditionally water softeners’ might have been used for this purpose but there are increasing environmental concerns about the use of water softeners .. in parts of California they are now banned. Fluid Dynamics is the UK’s ...
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Enhancement of ejector performance for a desalination system
This paper describes the use of Computational Fluid Dynamics (CFD) to investigate the performance of the ejector used in desalination applications that use air as the working fluid. A three-dimensional model for the CFD was used to investigate the effect of operating conditions and ejector geometry on ejector performance. The results show that ejector performance increases by increasing the ...
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Modelling of pressure drop in eccentric narrow horizontal annuli with the presence of cuttings and rotating drillpipe
Accurate pressure drop estimation is vital in wellbore hydraulic design. The present study investigates the effects of diameter ratio, fluid velocity, fluid type, fluid rheology and drillpipe rotation speed on pressure drop in eccentric horizontal wellbore with the presence of cuttings using computational fluid dynamics (CFD). The drillpipe is positioned at eccentricity of 0.623 and rotates about ...
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