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Bhramara Panitapu - One of the best experts on this subject based on the ideXlab platform.
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effect of axial gap between diffuser inlet and Impeller on efficiency and flow pattern of centrifugal fans
Applied Mechanics and Materials, 2013Co-Authors: Mojtaba Gholamian, Bhramara PanitapuAbstract:Inlet is one of the basic elements of squirrel cage fan that can have great effect on performance and losses, especially between inlet exit and first section of Impeller width. In this paper the effect of axial gap between inlet diffuser and Impeller on performance and flow pattern is considered. Three diffuser inlet Sizes with respect to Impeller Size (smaller, nearly same and bigger than inner Impeller diameter) and three axial gaps within the available dimensions of the casing and Impeller were chosen. Numerical simulations were performed to find the effect of this axial gap on flow pattern, performance and efficiency. From the simulation of each case study, flow pattern and its mechanism and the causes that affecting the efficiency and performance due to axial gap are analyzed and presented.
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effect of axial gap between inlet nozzle and Impeller on efficiency and flow pattern in centrifugal fans numerical and experimental analysis
Case Studies in Thermal Engineering, 2013Co-Authors: Mojtaba Gholamian, Bhramara PanitapuAbstract:Abstract Inlet is one of the basic elements of squirrel cage fan that can have great effect on performance and losses, especially between inlet nozzle exit and first section of Impeller width. But, enough research has not been done on its parameters. In this paper the effect of axial gap between inlet nozzle and Impeller on performance and flow pattern is considered. Four inlet nozzle Sizes with respect to Impeller Size (two smaller, nearly same and bigger than inner Impeller diameter) and three axial gaps within the physical dimensions of the casing and Impeller were chosen. Numerical simulations with different turbulence models, special geometry and mesh pattern were performed to find the effect of this axial gap on flow pattern, performance and efficiency. For the validation of numerical results, some experiments were done and all the performance parameters were compared with that of numerical simulations. These results show good matching between experimental and numerical results. From the simulation of each case study, flow pattern and its mechanism and the causes affecting the efficiency and performance due to axial gap are analyzed and presented.
Mojtaba Gholamian - One of the best experts on this subject based on the ideXlab platform.
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effect of axial gap between diffuser inlet and Impeller on efficiency and flow pattern of centrifugal fans
Applied Mechanics and Materials, 2013Co-Authors: Mojtaba Gholamian, Bhramara PanitapuAbstract:Inlet is one of the basic elements of squirrel cage fan that can have great effect on performance and losses, especially between inlet exit and first section of Impeller width. In this paper the effect of axial gap between inlet diffuser and Impeller on performance and flow pattern is considered. Three diffuser inlet Sizes with respect to Impeller Size (smaller, nearly same and bigger than inner Impeller diameter) and three axial gaps within the available dimensions of the casing and Impeller were chosen. Numerical simulations were performed to find the effect of this axial gap on flow pattern, performance and efficiency. From the simulation of each case study, flow pattern and its mechanism and the causes that affecting the efficiency and performance due to axial gap are analyzed and presented.
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effect of axial gap between inlet nozzle and Impeller on efficiency and flow pattern in centrifugal fans numerical and experimental analysis
Case Studies in Thermal Engineering, 2013Co-Authors: Mojtaba Gholamian, Bhramara PanitapuAbstract:Abstract Inlet is one of the basic elements of squirrel cage fan that can have great effect on performance and losses, especially between inlet nozzle exit and first section of Impeller width. But, enough research has not been done on its parameters. In this paper the effect of axial gap between inlet nozzle and Impeller on performance and flow pattern is considered. Four inlet nozzle Sizes with respect to Impeller Size (two smaller, nearly same and bigger than inner Impeller diameter) and three axial gaps within the physical dimensions of the casing and Impeller were chosen. Numerical simulations with different turbulence models, special geometry and mesh pattern were performed to find the effect of this axial gap on flow pattern, performance and efficiency. For the validation of numerical results, some experiments were done and all the performance parameters were compared with that of numerical simulations. These results show good matching between experimental and numerical results. From the simulation of each case study, flow pattern and its mechanism and the causes affecting the efficiency and performance due to axial gap are analyzed and presented.
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Numerical investigation on effect of inlet nozzle Size on efficiency and flow pattern in squirrel cage fans
Proceedings of the Institution of Mechanical Engineers Part A: Journal of Power and Energy, 2013Co-Authors: Mojtaba Gholamian, P. BhramaraAbstract:Squirrel cage fan is a special type of turbo machines commonly used in industries and buildings (as a part of heating, ventilation and air conditioning (HVAC) systems). There are lots of important parameters that can affect the performance and efficiency (energy consuming). Experiments have shown that there are some turbulent areas in volute and Impeller, and also in few cases, the relationships between the fan parameters, geometry and nondimensional parameters, and turbulent areas or performances were defined.In this paper, the effect of inlet-nozzle diameter on performance and flow pattern is considered. Three inlet nozzle Sizes with respect to Impeller Size were chosen (smaller, nearly same, and bigger than inner Impeller diameter), and numerical simulations with different turbulence models were performed to find the effect of inlet Size on flow pattern, performance, and efficiency. For the validation of numerical results, some experiments were done, and all the performance parameters were compared to ...
Somchart Chantasiriwan - One of the best experts on this subject based on the ideXlab platform.
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Estimation of Power Consumption by Centrifugal Pump with Reduced Impeller Size
Thammasat International Journal of Science and Technology, 2013Co-Authors: Somchart ChantasiriwanAbstract:Energy saving in centrifugal pumps by Impeller Size reduction is an efficient method. It is popular to estimate energy saving of this method by using the affinity laws. However, using the affinity laws alone to estimate energy saving without considering the characteristics of the individual pump and the pumping system may yield erroneous results. This paper is aimed at presenting a better method by using actual pump performance curves and incorporating the pumping system into the analysis. It is shown that both head and efficiency can be approximated by quadratic functions of flow rate. Together with the assumption that the system curve is also a quadratic function, the presented method is capable of computing pump power input at given values of flow rate and static head. Results from this method suggest a simple and more accurate formula for estimating energy saving in centrifugal pumps by Impeller Size reduction. Keywords: pump characteristics, energy efficiency, Impeller trimming, affinity laws
Azri Alias - One of the best experts on this subject based on the ideXlab platform.
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Application of Taguchi Method in optimization of design darameter for turbocharger vaned diffuser
'Emerald', 2017Co-Authors: Hilmi Amiruddin, Wan Mohd Faizal, Wan Mahmood, Shahrir Abdullah, Mohd Radzi, Abu Mansor, R. Mamat, Azri AliasAbstract:Purpose – The purpose of this study is to determine the best vaned diffuser design that can generate higher pressure output at a predetermined speed. Design/methodology/approach – Several vaned diffusers of thin, flat-type design with different number of blades and blade angle were fabricated. The vaned diffusers were fitted inside the turbocharger compressor and test on a cold-flow turbocharger test rig. A Taguchi L27 orthogonal array is selected for analysis of the data. Influence of number of blades, blade angle and rotational speed on output pressure is studied using the analysis of variance (ANOVA) technique. Finally, confirmation tests are conducted to validate the experimental results. Findings – The optimum design parameters of the vaned diffuser using signal-to-noise ratio analysis were six blades type, blade angle of 18° and rotational speed of 70,000 rpm. Results from ANOVA showed that the speed has the highest influence on output pressure. The number of bladesand blade angle produced the least effect on the pressure output. Originality/value – The study used the turbocharger with the Impeller Size 60 mm and adapted vaned diffuser to increase the output pressure
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Application of Taguchi method in optimization of design parameter for turbocharger vaned diffuser
'Emerald', 2017Co-Authors: Hilmi Amiruddin, Wan Mohd Faizal, Wan Mahmood, Shahrir Abdullah, Mohd Radzi, Abu Mansor, R. Mamat, Azri AliasAbstract:Purpose: The purpose of this study is to determine the best vaned diffuser design that can generate higher pressure output at a predetermined speed. Design/methodology/approach: Several vaned diffusers of thin, flat-type design with different number of blades and blade angle were fabricated. The vaned diffusers were fitted inside the turbocharger compressor and test on a cold-flow turbocharger test rig. A Taguchi L27 orthogonal array is selected for analysis of the data. Influence of number of blades, blade angle and rotational speed on output pressure is studied using the analysis of variance (ANOVA) technique. Finally, confirmation tests are conducted to validate the experimental results. Findings: The optimum design parameters of the vaned diffuser using signal-to-noise ratio analysis were six blades type, blade angle of 18° and rotational speed of 70,000 rpm. Results from ANOVA showed that the speed has the highest influence on output pressure. The number of blades and blade angle produced the least effect on the pressure output. Originality/value: The study used the turbocharger with the Impeller Size 60 mm and adapted vaned diffuser to increase the output pressure
Nenad Kuzmanic - One of the best experts on this subject based on the ideXlab platform.
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effect of Impeller Size on the kinetics of copper exchange onto zeolite nax
1st Journal of Thermal Analysis and Calorimetry Conference and 6th V4 Thermoanalytical Conference, 2017Co-Authors: Sandra Svilovic, Marija Cosic, Stipisic Renato, Davor Rusic, Nenad KuzmanicAbstract:Effect of hydrodynamics on ion exchange kinetics in a batch reactor is still not properly studied despite the fact that proper mixing parameters may considerably improve the process of solid suspension and influence the hydrodynamic layer thickness responsible for the mass rate transfer. For this reason the aim of this work was to analyse the influence of hydrodynamic conditions generated by different Impeller diameters on the maximum amount of copper exchange onto zeolite NaX and exchange kinetics as well. Investigations were carried out in a 2.1 dm3 baffled batch reactor at the state of complete suspension. Mixing was conducted using straight blade turbine (4-SBT) which Impeller to tank diameter ratio (D/T) were varied in the range from 0.46 to 0.68. Solution containing Cu2+ was prepared by dissolving the appropriate weight of Cu(NO3)2∙3H2O. The initial concentration (7 mmol/L) was checked by Perkin Elmer Lambda 25 UV/VIS spectrophotometer. Zeolite NaX was crushed and sieved to obtain particles in the range from 0.071 – 0.09 mm. In the first part of the examination just suspended Impeller speed, NJS, was determine for different Impeller diameters and mass of zeolite (10.5, 13.125, 15.75 and 18.345 g) according to the Zwietering criterion. For all examined conditions power consumption was determined as well. In the second part of examination the influence of hydrodynamic on the kinetics of copper exchange on zeolite were analysed. Kinetics experiments were carried out at just suspended Impeller speed (NJS) for all Impellers and solid/liquid ratios used, while solution temperature was kept constant. Obtained experimental kinetics data were fitted using Elovich and Blanchard model [1-2]. The obtained results showed that just suspended Impeller speed decreases as Impeller diameter increases. The increase in zeolite mass causing the slight increase of NJS which is more pronounced in the systems with smaller Impeller. Power consumption, at the state at complete suspension, generally decreases as Impeller diameter increases. Kinetics results indicated that amount of copper ion sorbed increases sharply with the time in the initial stage and then gradually until the equilibrium is reached for all hydrodynamics conditions examined. Considering the relationship between amount of copper exchanged and power consumption at the state of complete suspension it is possible to suggest more viable (D/T) ratio for the examined process.
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influence of Impeller Size and position on power consumption in dual radial Impeller crystallizer
XI. susret mladih kemijskih inženjera 2016., 2016Co-Authors: Antonija Kacunic, Marija Cosic, Nenad KuzmanicAbstract:Mnoge operacije u kemijskoj industriji u velikoj mjeri ovise o uspjesno provedenom mijesanju. Koliko ce ono biti uspjesno moguce je procijeniti kroz nekoliko parametara, pa tako i kroz poznavanje vrijednosti snage mijesanja. Snaga mijesanja predstavlja energiju preko mijesala dovedenu u sustav. Njezina vrijednost, između ostalog, utjece i na velicine važne pri provedbi procesa kristalizacije kao sto su stupanj izmjesanosti te koeficijent prijenosa tvari. U ovom istraživanju, saržna kristalizacija boraksa je provedena u sustavu volumena 15 dm3 pri cemu je omjer visine stupca maticne otopine i promjera kristalizatora (H/T) iznosio 1.3. Mijesanje se provodilo uporabom dvaju radijalnih turbinskih mijesala (tzv. 4-SBT tip mijesala) pri onoj brzini vrtnje koja je osiguravala stanje potpune suspenzije (N = NJS). U sustavu su kontinuirano pracene koncentracija maticne otopine (uz uporabu Na-ion selektivne elektrode) te zakretni moment (koristenjem mjerila zakretnog momenta Himmelstein and Co.). Ispitan je utjecaj velicine mijesala – D/dT (promjer mijesala/promjer mijesalice), utjecaj udaljenosti donjeg mijesala od dna – c/D te međusobni razmak dvaju mijesala – s/D na vrijednost snage mijesanja. Snaga mijesanja je izracunata iz izmjerenih vrijdnosti zakretnog momenta te je izražena kao snaga utrosena po jedinici mase suspenzije – P/m. Rezultati su pokazali kako utrosak snage izrazito ovisi kako o velicini tako i o položaju mijesala unutar kristalizatora. Obzirom da je udio troskova vezanih uz utrosak snage mijesanja u ukupnim troskovima proizvodnje znatan, nužno je razmotriti alternativne konfiguracije mijesala kako bi se proizveo produkt zadovoljavajucih karakteristika uz minimalne troskove proizvodnje.
