The Experts below are selected from a list of 2742 Experts worldwide ranked by ideXlab platform
S Suresh - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation on heat transfer effect of conical strip inserts in a circular tube under Laminar Flow
Frontiers in Energy, 2016Co-Authors: M. Arulprakasajothi, K. Elangovan, K. Hema Chandra Reddy, S SureshAbstract:The aim of this paper is to observe the Nusselt number and friction factor behavior of the circular tube with conical strip inserts as turbulators in a Laminar Flow Condition, using staggered and non-staggered conical strips with three different twist ratios ( Y = 2, 3 and 5). The conical strip is inserted in the forward and backward direction individually compared to the Flow of water which is the working fluid. The results indicate that the conical strip inserts increases the Nusselt number when compared to the plain surface tube. It is observed that the strip geometry has a major effect on the thermal performance of the circular tube. On examination of different strips for determining the enhancement of Nusselt number, the staggered conical strip with the twist ratio of Y = 3 has given a better result compared to the other two strips. Finally, correlations have been derived using regression analysis for predicting the Nusselt number and friction factor.
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Experimental investigation on convective heat transfer and friction factor in a helically coiled tube with Al2O3/water nanofluid
Journal of Mechanical Science and Technology, 2013Co-Authors: P. C. Mukesh Kumar, Jeetesh Kumar, S SureshAbstract:In this study, the heat transfer and friction factor of a shell and helically coiled tube heat exchanger using Al2O3 / water nanofluid at 0.1%, 0.4% and 0.8% particle volume concentration were tested. The test was conducted under Laminar Flow Condition at 5100 < Rei < 8700. It is found that the overall heat transfer coefficient, inner heat transfer coefficient and experimental inner Nusselt number are 24%, 25% and 28%, respectively, higher than water at 0.8% particle volume concentration of nanofluid. It is observed that the presence of nanoparticles further intensify the formation of secondary Flow and proper mixing of fluid when nanofluid passes through the helically coiled tube. Apart from further Flow intensification, higher thermal conductivity of nanofluid and random movement of nanoparticles contribute to the enhanced heat transfer coefficient. Also found that the friction factor increases over particle volume concentration and this is due to increased nanofluid viscosity while increasing particle volume concentration.
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heat transfer enhancement in a helically coiled tube with al2o3 water nanofluid under Laminar Flow Condition
International Journal of Nanoscience, 2012Co-Authors: P Mukesh C Kumar, Jeetesh Kumar, S Suresh, Praveen K BabuAbstract:In this experimental investigation, the heat transfer coefficients of a shell and helically coiled tube heat exchanger using Al2O3/water nanofluid under Laminar Flow Condition were studied. The Al2O3 nanoparticles were characterized by X-Ray diffraction (XRD). The Al2O3/water nanofluid at 0.1%, 0.4% and 0.8% particle volume concentration were prepared by using two step method. The prepared nanofluid was characterized by scanning electron microscope (SEM). It is observed that the overall heat transfer coefficient, inner heat transfer coefficient and experimental inner Nusselt number increase while increasing particle volume concentration and increasing inner Dean number. The enhancement of overall heat transfer coefficient was found to be 7%, 16.9% and 24.2% at 0.1%, 0.4% and 0.8% Al2O3/water nanofluid respectively when compared with water. The enhancement of tube side experimental Nusselt number was found to be 17%, 22.9% and 28% at 0.1%, 0.4% and 0.8% particle volume concentration of Al2O3/water nanofluid respectively when compared with water at fixed Dean number. The tests were conducted in the range of 1600 < De < 2700, and 5200 < Re < 8600 under Laminar Flow Condition and counter Flow configuration. These enhancements are due to higher thermal conductivity of nanofluid while increasing particle volume concentration and Brownian motion of nanoparticles. It is studied that there is no negative impact on formation of secondary Flow and mixing of fluid when nanofluid passes through the helically coiled tube.
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HEAT TRANSFER ENHANCEMENT IN A HELICALLY COILED TUBE WITH Al2O3/WATER NANOFLUID UNDER Laminar Flow Condition
International Journal of Nanoscience, 2012Co-Authors: P. C. Mukesh Kumar, Jeetesh Kumar, S Suresh, K. Praveen BabuAbstract:In this experimental investigation, the heat transfer coefficients of a shell and helically coiled tube heat exchanger using Al2O3/water nanofluid under Laminar Flow Condition were studied. The Al2O3 nanoparticles were characterized by X-Ray diffraction (XRD). The Al2O3/water nanofluid at 0.1%, 0.4% and 0.8% particle volume concentration were prepared by using two step method. The prepared nanofluid was characterized by scanning electron microscope (SEM). It is observed that the overall heat transfer coefficient, inner heat transfer coefficient and experimental inner Nusselt number increase while increasing particle volume concentration and increasing inner Dean number. The enhancement of overall heat transfer coefficient was found to be 7%, 16.9% and 24.2% at 0.1%, 0.4% and 0.8% Al2O3/water nanofluid respectively when compared with water. The enhancement of tube side experimental Nusselt number was found to be 17%, 22.9% and 28% at 0.1%, 0.4% and 0.8% particle volume concentration of Al2O3/water nanofluid respectively when compared with water at fixed Dean number. The tests were conducted in the range of 1600 < De < 2700, and 5200 < Re < 8600 under Laminar Flow Condition and counter Flow configuration. These enhancements are due to higher thermal conductivity of nanofluid while increasing particle volume concentration and Brownian motion of nanoparticles. It is studied that there is no negative impact on formation of secondary Flow and mixing of fluid when nanofluid passes through the helically coiled tube.
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Experimental studies on heat transfer and friction factor characteristics of Laminar Flow through a circular tube fitted with regularly spaced helical screw-tape inserts
Experimental Thermal and Fluid Science, 2007Co-Authors: Palani Sivashanmugam, S SureshAbstract:Experimental investigation of heat transfer and friction factor characteristics of circular tube fitted with full-length helical screw element of different twist ratio, and helical screw inserts with spacer length 100, 200, 300 and 400 mm have been studied with uniform heat flux under Laminar Flow Condition. The experimental data obtained are verified with those obtained from plain tube published data. The effect of spacer length on heat transfer augmentation and friction factor, and the effect of twist ratio on heat transfer augmentation and friction factor have been presented separately. The decrease in Nusselt number for the helical twist with spacer length is within 10% for each subsequent 100 mm increase in spacer length. The decrease in friction factor is nearly two times lower than the full length helical twist at low Reynolds number, and four times lower than the full length helical twist at high Reynolds number for all twist ratio. The regularly spaced helical screw inserts can safely be used for heat transfer augmentation without much increase in pressure drop than full length helical screw inserts.
Y. Bashirzadeh - One of the best experts on this subject based on the ideXlab platform.
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Heat transfer of Nano-fluids as working fluids of swimming pool heat exchangers
international journal of advanced design and manufacturing technology, 2014Co-Authors: Y. Bashirzadeh, N. AshrafiAbstract:The present experimental study reports on enhancement of heat transfer by addition of nanoparticles to the working fluid of commercial swimming pool heat exchangers under Laminar Flow Condition. Three different concentrations of Titanium dioxide nanoparticles were added to the water as working fluid of a typical forced convective heat exchanger used to transfer heat to public swimming pools. The experimental setup is capable of measuring velocity, heat transfer rate, and temperature at different points. TiO 2 nanoparticles with mean diameter of 20 nm were used. The effects of concentration of suspended nanoparticles and that of Reynolds number on forced convective heat transfer were investigated. It is observed that at 0.1%, 0.5% and 1% weight concentration of suspended TiO 2 nanoparticles, the average convective heat transfer coefficient improved by 1.1%, 15.9% and 31.6% respectively. The coefficient is further increased at higher Reynolds numbers. The efficiency of heat exchanger is evaluated for different scenarios.
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Enhancement of Heat Transfer by Nanoparticles Added to the Working Fluid of Swimming Pool Heat Exchangers
Volume 7: Fluids and Heat Transfer Parts A B C and D, 2012Co-Authors: N. Ashrafi, Y. BashirzadehAbstract:The present experimental study reports on enhancement of heat transfer by addition of nanoparticles to the working fluid of commercial swimming pool heat exchangers under Laminar Flow Condition. Three different concentrations of Titanium dioxide nanoparticles were added to the water as working fluid of a typical forced convective heat exchanger used to transfer heat to public swimming pools. The experimental setup is capable of measuring velocity, heat transfer rate, and temperature at different points. TiO2 nanoparticles with mean diameter of 20 nm were used. The effects of concentration of suspended nanoparticles and that of Reynolds number on forced convective heat transfer were investigated. It is observed that at 0.1%, 0.5% and 1% weight concentration of suspended TiO2 nanoparticles, the average convective heat transfer coefficient improved by 1.1%, 15.9% and 31.6% respectively. The coefficient is further increased at higher Reynolds numbers. The efficiency of heat exchanger is evaluated for different scenarios.Copyright © 2012 by ASME
N. Ashrafi - One of the best experts on this subject based on the ideXlab platform.
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Heat transfer of Nano-fluids as working fluids of swimming pool heat exchangers
international journal of advanced design and manufacturing technology, 2014Co-Authors: Y. Bashirzadeh, N. AshrafiAbstract:The present experimental study reports on enhancement of heat transfer by addition of nanoparticles to the working fluid of commercial swimming pool heat exchangers under Laminar Flow Condition. Three different concentrations of Titanium dioxide nanoparticles were added to the water as working fluid of a typical forced convective heat exchanger used to transfer heat to public swimming pools. The experimental setup is capable of measuring velocity, heat transfer rate, and temperature at different points. TiO 2 nanoparticles with mean diameter of 20 nm were used. The effects of concentration of suspended nanoparticles and that of Reynolds number on forced convective heat transfer were investigated. It is observed that at 0.1%, 0.5% and 1% weight concentration of suspended TiO 2 nanoparticles, the average convective heat transfer coefficient improved by 1.1%, 15.9% and 31.6% respectively. The coefficient is further increased at higher Reynolds numbers. The efficiency of heat exchanger is evaluated for different scenarios.
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Enhancement of Heat Transfer by Nanoparticles Added to the Working Fluid of Swimming Pool Heat Exchangers
Volume 7: Fluids and Heat Transfer Parts A B C and D, 2012Co-Authors: N. Ashrafi, Y. BashirzadehAbstract:The present experimental study reports on enhancement of heat transfer by addition of nanoparticles to the working fluid of commercial swimming pool heat exchangers under Laminar Flow Condition. Three different concentrations of Titanium dioxide nanoparticles were added to the water as working fluid of a typical forced convective heat exchanger used to transfer heat to public swimming pools. The experimental setup is capable of measuring velocity, heat transfer rate, and temperature at different points. TiO2 nanoparticles with mean diameter of 20 nm were used. The effects of concentration of suspended nanoparticles and that of Reynolds number on forced convective heat transfer were investigated. It is observed that at 0.1%, 0.5% and 1% weight concentration of suspended TiO2 nanoparticles, the average convective heat transfer coefficient improved by 1.1%, 15.9% and 31.6% respectively. The coefficient is further increased at higher Reynolds numbers. The efficiency of heat exchanger is evaluated for different scenarios.Copyright © 2012 by ASME
Alcherio Martinoli - One of the best experts on this subject based on the ideXlab platform.
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A comparison of casting and spiraling algorithms for odor source localization in Laminar Flow
2008 IEEE International Conference on Robotics and Automation, 2008Co-Authors: Thomas Lochmatter, Xavier Raemy, Loic Matthey, Saurabh Indra, Alcherio MartinoliAbstract:We compare two well-known algorithms for locating odor sources in environments with a main wind Flow. Their plume tracking performance is tested through systematic experiments with real robots in a wind tunnel under Laminar Flow Condition. We present the system setup and show the wind and odor profiles. The results are then compared in terms of time and distance to reach the source, as well as speed in upwind direction. We conclude that the spiral-surge algorithm yields significantly better results than the casting algorithm, and discuss possible rationales behind this performance difference.
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ICRA - A comparison of casting and spiraling algorithms for odor source localization in Laminar Flow
2008 IEEE International Conference on Robotics and Automation, 2008Co-Authors: Thomas Lochmatter, Xavier Raemy, Loic Matthey, Saurabh Indra, Alcherio MartinoliAbstract:We compare two well-known algorithms for locating odor sources in environments with a main wind Flow. Their plume tracking performance is tested through systematic experiments with real robots in a wind tunnel under Laminar Flow Condition. We present the system setup and show the wind and odor profiles. The results are then compared in terms of time and distance to reach the source, as well as speed in upwind direction. We conclude that the spiral-surge algorithm yields significantly better results than the casting algorithm, and discuss possible rationales behind this performance difference.
Ming Xiao - One of the best experts on this subject based on the ideXlab platform.
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Particle Mobilization and Piping Erosion of Granular Soil Under Various Fluid Characteristics and Flow Conditions
Dam Breach Modelling and Risk Disposal, 2020Co-Authors: Ming Xiao, Benjamin T. Adams, Asghar Gholizadeh-vayghan, Yuetan MaAbstract:This paper presents the soil’s internal erosion in earthen embankments due to seepage with various physicochemical fluid characteristics and Flow Conditions. The paper includes two components: (1) experimental study on the relative and interactive effects of fluid’s viscosity, pH, and ionic strength on the incipient motion of a single granular particle under Laminar Flow Condition, and (2) bench-scale piping erosion progression of sand considering the same seepage’s physicochemical characteristics under turbulent Flow. An innovative experimental setup was designed and constructed that can simultaneously adjust fluid’s viscosity, pH, and ionic strength and provide repeatable test results on particle’s incipient motion and soil erosion rate index. This research showed the relative and interactive effects of three physicochemical characteristics (viscosity, pH and ionic strength) of permeating fluid on particle mobilization and on piping erosion of a sandy soil. This paper suggests in the field evaluation of piping in earthen embankments, if the subsurface seepage is known to possess different physicochemical characteristics from those of tap water or distilled water, the fluid’s properties should be considered in the laboratory tests of piping.
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relative and interactive effects of fluid s physicochemical characteristics on the incipient motion of a granular particle under Laminar Flow Condition
Journal of Hydraulic Engineering, 2018Co-Authors: Ming Xiao, Benjamin T. Adams, Asghar Gholizadehvayghan, Farshad RajabipourAbstract:AbstractThis paper presents an experimental research for studying the relative and interactive effects of three physicochemical fluid characteristics (viscosity, pH, and ionic strength) on the inci...
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Relative and Interactive Effects of Fluid’s Physicochemical Characteristics on the Incipient Motion of a Granular Particle under Laminar Flow Condition
Journal of Hydraulic Engineering, 2018Co-Authors: Ming Xiao, Benjamin T. Adams, Asghar Gholizadeh-vayghan, Farshad RajabipourAbstract:AbstractThis paper presents an experimental research for studying the relative and interactive effects of three physicochemical fluid characteristics (viscosity, pH, and ionic strength) on the inci...
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Development of experimental methodology of investigating the relative and interactive effects of physicochemical properties of permeating fluids on incipient motion of granular particles
Scour and Erosion, 2016Co-Authors: Ming Xiao, Benjamin T. AdamsAbstract:Particle mobilization is a fundamental aspect in the process of soil erosion and has been known to affect the stability of critical infrastructures such as levees and dams. In the field, fluids permeating through earthen dams or levees may exhibit a range of physicochemical characteristics that may affect the incipient motion of soils. This paper presents an experimental methodology that can be used to evaluate the relative and interactive effects of a fluid’s physicochemical properties on the incipient motion of a granular particle under Laminar Flow Condition. The results obtained from the present research demonstrated the ability of the experimental setup and methodology in studying the effect physicochemical properties (such as viscosity, pH and ionic strength) of fluids on incipient motion of granular particles under Laminar Flow Condition.
