The Experts below are selected from a list of 21765 Experts worldwide ranked by ideXlab platform

Piya Biswas - One of the best experts on this subject based on the ideXlab platform.

  • experimental study on bank erosion and protection using submerged vane placed at an Optimum Angle in a 180 laboratory channel bend
    Geomorphology, 2017
    Co-Authors: Abdul Karim Barbhuiya, Piya Biswas
    Abstract:

    Abstract Unsteadiness of the vertical velocity profile and secondary flow in open channel bends poses serious problems in hydraulic engineering design. Insertion of vertical submerged vanes in the channel bend at an Optimum Angle with the tangential component of flow can minimize the unsteadiness and generation of secondary flow resulting in the reduction of scour depth at the outer bank. A series of experiments were conducted in a 180° bend laboratory channel to study flow erosion and effective ness of the submerged vane in reducing scour depth. The average approach to flow velocity at 0.20 m flow depth above the lowest initial bed level was 25 cm/s. An Acoustic Doppler Velocimeter (ADV) was used to measure the three-dimensional time-averaged velocity components at different azimuthal sections on stabilized nonscoured beds without vane. Scour bed profile without vanes shows that bank erosion in a 180° parabolic-shaped bed channel occurs mostly at the zone from bend Angles 120° to 140°. Vanes were installed at Angles of 10°, 15°, 20°, 30°, and 40° to the tangential flow component maintaining a spacingof 75 cm distance from one vane to another. Experimental results show that a 15° vane Angle produces best result in reducing outer bank scour in a parabolic-shaped channel. The data presented in this paper can also be used for validating three-dimensional turbulence models for simulating flows in a curved channel.

  • Experimental study on bank erosion and protection using submerged vane placed at an Optimum Angle in a 180° laboratory channel bend
    Geomorphology, 2017
    Co-Authors: Litan Dey, Abdul Karim Barbhuiya, Piya Biswas
    Abstract:

    Abstract Unsteadiness of the vertical velocity profile and secondary flow in open channel bends poses serious problems in hydraulic engineering design. Insertion of vertical submerged vanes in the channel bend at an Optimum Angle with the tangential component of flow can minimize the unsteadiness and generation of secondary flow resulting in the reduction of scour depth at the outer bank. A series of experiments were conducted in a 180° bend laboratory channel to study flow erosion and effective ness of the submerged vane in reducing scour depth. The average approach to flow velocity at 0.20 m flow depth above the lowest initial bed level was 25 cm/s. An Acoustic Doppler Velocimeter (ADV) was used to measure the three-dimensional time-averaged velocity components at different azimuthal sections on stabilized nonscoured beds without vane. Scour bed profile without vanes shows that bank erosion in a 180° parabolic-shaped bed channel occurs mostly at the zone from bend Angles 120° to 140°. Vanes were installed at Angles of 10°, 15°, 20°, 30°, and 40° to the tangential flow component maintaining a spacingof 75 cm distance from one vane to another. Experimental results show that a 15° vane Angle produces best result in reducing outer bank scour in a parabolic-shaped channel. The data presented in this paper can also be used for validating three-dimensional turbulence models for simulating flows in a curved channel.

D. Ravindran - One of the best experts on this subject based on the ideXlab platform.

  • Iterative approach for optimising coefficient of power, coefficient of lift and drag of wind turbine rotor
    Renewable Energy, 2012
    Co-Authors: Sundaresan Rajakumar, D. Ravindran
    Abstract:

    This paper presents an approach for the determination of aerodynamic performance characteristics of horizontal-axis wind turbines. The Optimum twist of a windmill blade is examined on the basis of elementary blade-element theory. For a given wind speed and blade angular velocity, it is shown that the maximum power efficiency is achieved when the blade is twisted according to a program that depends upon the variation of the sectional lift and drag coefficients with Angle of attack. Results for a typical airfoil cross-section show that the Optimum Angle of attack and Optimum twist Angle of the blade improves the performance of the wind turbine.

Arif Hepbasli - One of the best experts on this subject based on the ideXlab platform.

  • determination of the Optimum tilt Angle of solar collectors for building applications
    Building and Environment, 2007
    Co-Authors: Huseyin Gunerhan, Arif Hepbasli
    Abstract:

    Solar energy technologies offer a clean, renewable and domestic energy source, and are essential components of a sustainable energy future. This paper deals with the determination of the Optimum tilt Angle of solar collectors for building applications. The Optimum Angle is calculated by searching for the values for which the total radiation on the collector surface is a maximum for a particular day or a specific period. An application of the model is done using the experimental data measured for Izmir in Turkey. The best orientation for solar collectors in Izmir is due south. For increasing the utilization efficiency of solar collectors, it is recommended that, if it is possible, the solar collector should be mounted at the monthly average tilt Angle and the slope adjusted once a month.

A. Fazlizan - One of the best experts on this subject based on the ideXlab platform.

  • the experimental study on the wind turbine s guide vanes and diffuser of an exhaust air energy recovery system integrated with the cooling tower
    Energy Conversion and Management, 2014
    Co-Authors: Wen Tong Chong, A. Fazlizan
    Abstract:

    An assembly of two vertical axis wind turbines (VAWTs) and an enclosure is installed above a cooling tower to harness the discharged wind for electricity generation. The enclosure consists of guide-vanes and diffuser-plates, is used to enhance the rotational speed of the turbines for power augmentation. The Angle of the guide-vanes is optimized to ensure the oncoming wind stream impinges the rotor blades of the turbine at an Optimum Angle. The diffuser-plates are tilted at an Optimum Angle to increase the discharged airflow rate. The performance of the system is tested in the laboratory followed by a field test on an actual size cooling tower. The VAWT performance is increased in the range of 7–8% with the integration of enclosure. There is no significant difference in the current consumption of the fan motor between the bare cooling tower and the one with installed VAWTs. With the presence of this system, approximately 17.5 GW h/year is expected to be recovered from 3000 units of cooling towers at commercial areas, assuming the cooling tower is driven by a 7.5 kW fan motor and operates 16 h/day. This amount of recovered energy can also be translated into 13% reduction in CO2 emission.

Abdul Karim Barbhuiya - One of the best experts on this subject based on the ideXlab platform.

  • experimental study on bank erosion and protection using submerged vane placed at an Optimum Angle in a 180 laboratory channel bend
    Geomorphology, 2017
    Co-Authors: Abdul Karim Barbhuiya, Piya Biswas
    Abstract:

    Abstract Unsteadiness of the vertical velocity profile and secondary flow in open channel bends poses serious problems in hydraulic engineering design. Insertion of vertical submerged vanes in the channel bend at an Optimum Angle with the tangential component of flow can minimize the unsteadiness and generation of secondary flow resulting in the reduction of scour depth at the outer bank. A series of experiments were conducted in a 180° bend laboratory channel to study flow erosion and effective ness of the submerged vane in reducing scour depth. The average approach to flow velocity at 0.20 m flow depth above the lowest initial bed level was 25 cm/s. An Acoustic Doppler Velocimeter (ADV) was used to measure the three-dimensional time-averaged velocity components at different azimuthal sections on stabilized nonscoured beds without vane. Scour bed profile without vanes shows that bank erosion in a 180° parabolic-shaped bed channel occurs mostly at the zone from bend Angles 120° to 140°. Vanes were installed at Angles of 10°, 15°, 20°, 30°, and 40° to the tangential flow component maintaining a spacingof 75 cm distance from one vane to another. Experimental results show that a 15° vane Angle produces best result in reducing outer bank scour in a parabolic-shaped channel. The data presented in this paper can also be used for validating three-dimensional turbulence models for simulating flows in a curved channel.

  • Experimental study on bank erosion and protection using submerged vane placed at an Optimum Angle in a 180° laboratory channel bend
    Geomorphology, 2017
    Co-Authors: Litan Dey, Abdul Karim Barbhuiya, Piya Biswas
    Abstract:

    Abstract Unsteadiness of the vertical velocity profile and secondary flow in open channel bends poses serious problems in hydraulic engineering design. Insertion of vertical submerged vanes in the channel bend at an Optimum Angle with the tangential component of flow can minimize the unsteadiness and generation of secondary flow resulting in the reduction of scour depth at the outer bank. A series of experiments were conducted in a 180° bend laboratory channel to study flow erosion and effective ness of the submerged vane in reducing scour depth. The average approach to flow velocity at 0.20 m flow depth above the lowest initial bed level was 25 cm/s. An Acoustic Doppler Velocimeter (ADV) was used to measure the three-dimensional time-averaged velocity components at different azimuthal sections on stabilized nonscoured beds without vane. Scour bed profile without vanes shows that bank erosion in a 180° parabolic-shaped bed channel occurs mostly at the zone from bend Angles 120° to 140°. Vanes were installed at Angles of 10°, 15°, 20°, 30°, and 40° to the tangential flow component maintaining a spacingof 75 cm distance from one vane to another. Experimental results show that a 15° vane Angle produces best result in reducing outer bank scour in a parabolic-shaped channel. The data presented in this paper can also be used for validating three-dimensional turbulence models for simulating flows in a curved channel.