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Humphrey Pasley - One of the best experts on this subject based on the ideXlab platform.

  • Differential absorption lidar (DIAL) measurements of the mechanisms of volatile organic compound loss from external floating roofed tanks
    Remote Sensing, 1998
    Co-Authors: Simon J. O Connor, H. L. Walmsley, Humphrey Pasley
    Abstract:

    This work describes how an IR DIAL system has been sued both to measure the emission rates of Volatile Organic Compounds (VOCs) from external floating roof tanks, and in addition, to map the concentration of VOCs over the roofs of tanks. The data presented shows concentration iso-surfaces resolved at 0.2 ppm intervals over an operating 50 m diameter tank. This data will be used to validate subsequent models of tank emissions. The data suggests that when the floating roof is sufficiently low inside the tank a re-circulating air flow is established that extends for several meters into the open air above the tank rim. In this instance the emission rate of product from the tank is the rate of bleed off from the re-Circulation Zone into the free air stream. As the tank roof height is increased, it is expected that a point will be reached where the re-circulating Zone shrinks to a small region near the rim and the majority of the tank roof is exposed to the free stream air flow. The existence of a large re-Circulation Zone when the roof is low is confirmed by the preliminary results of flow measurements above a tank roof.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

  • Differential absorption lidar (DIAL) measurements of the mechanisms of volatile organic compound loss from external floating roofed tanks
    Remote Sensing, 1998
    Co-Authors: Simon J. O Connor, H. L. Walmsley, Humphrey Pasley
    Abstract:

    This work describes how an IR DIAL system has been sued both to measure the emission rates of Volatile Organic Compounds (VOCs) from external floating roof tanks, and in addition, to map the concentration of VOCs over the roofs of tanks. The data presented shows concentration iso-surfaces resolved at 0.2 ppm intervals over an operating 50 m diameter tank. This data will be used to validate subsequent models of tank emissions. The data suggests that when the floating roof is sufficiently low inside the tank a re-circulating air flow is established that extends for several meters into the open air above the tank rim. In this instance the emission rate of product from the tank is the rate of bleed off from the re-Circulation Zone into the free air stream. As the tank roof height is increased, it is expected that a point will be reached where the re-circulating Zone shrinks to a small region near the rim and the majority of the tank roof is exposed to the free stream air flow. The existence of a large re-Circulation Zone when the roof is low is confirmed by the preliminary results of flow measurements above a tank roof.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Simon J. O Connor - One of the best experts on this subject based on the ideXlab platform.

  • Differential absorption lidar (DIAL) measurements of the mechanisms of volatile organic compound loss from external floating roofed tanks
    Remote Sensing, 1998
    Co-Authors: Simon J. O Connor, H. L. Walmsley, Humphrey Pasley
    Abstract:

    This work describes how an IR DIAL system has been sued both to measure the emission rates of Volatile Organic Compounds (VOCs) from external floating roof tanks, and in addition, to map the concentration of VOCs over the roofs of tanks. The data presented shows concentration iso-surfaces resolved at 0.2 ppm intervals over an operating 50 m diameter tank. This data will be used to validate subsequent models of tank emissions. The data suggests that when the floating roof is sufficiently low inside the tank a re-circulating air flow is established that extends for several meters into the open air above the tank rim. In this instance the emission rate of product from the tank is the rate of bleed off from the re-Circulation Zone into the free air stream. As the tank roof height is increased, it is expected that a point will be reached where the re-circulating Zone shrinks to a small region near the rim and the majority of the tank roof is exposed to the free stream air flow. The existence of a large re-Circulation Zone when the roof is low is confirmed by the preliminary results of flow measurements above a tank roof.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

  • Differential absorption lidar (DIAL) measurements of the mechanisms of volatile organic compound loss from external floating roofed tanks
    Remote Sensing, 1998
    Co-Authors: Simon J. O Connor, H. L. Walmsley, Humphrey Pasley
    Abstract:

    This work describes how an IR DIAL system has been sued both to measure the emission rates of Volatile Organic Compounds (VOCs) from external floating roof tanks, and in addition, to map the concentration of VOCs over the roofs of tanks. The data presented shows concentration iso-surfaces resolved at 0.2 ppm intervals over an operating 50 m diameter tank. This data will be used to validate subsequent models of tank emissions. The data suggests that when the floating roof is sufficiently low inside the tank a re-circulating air flow is established that extends for several meters into the open air above the tank rim. In this instance the emission rate of product from the tank is the rate of bleed off from the re-Circulation Zone into the free air stream. As the tank roof height is increased, it is expected that a point will be reached where the re-circulating Zone shrinks to a small region near the rim and the majority of the tank roof is exposed to the free stream air flow. The existence of a large re-Circulation Zone when the roof is low is confirmed by the preliminary results of flow measurements above a tank roof.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

H. L. Walmsley - One of the best experts on this subject based on the ideXlab platform.

  • Differential absorption lidar (DIAL) measurements of the mechanisms of volatile organic compound loss from external floating roofed tanks
    Remote Sensing, 1998
    Co-Authors: Simon J. O Connor, H. L. Walmsley, Humphrey Pasley
    Abstract:

    This work describes how an IR DIAL system has been sued both to measure the emission rates of Volatile Organic Compounds (VOCs) from external floating roof tanks, and in addition, to map the concentration of VOCs over the roofs of tanks. The data presented shows concentration iso-surfaces resolved at 0.2 ppm intervals over an operating 50 m diameter tank. This data will be used to validate subsequent models of tank emissions. The data suggests that when the floating roof is sufficiently low inside the tank a re-circulating air flow is established that extends for several meters into the open air above the tank rim. In this instance the emission rate of product from the tank is the rate of bleed off from the re-Circulation Zone into the free air stream. As the tank roof height is increased, it is expected that a point will be reached where the re-circulating Zone shrinks to a small region near the rim and the majority of the tank roof is exposed to the free stream air flow. The existence of a large re-Circulation Zone when the roof is low is confirmed by the preliminary results of flow measurements above a tank roof.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

  • Differential absorption lidar (DIAL) measurements of the mechanisms of volatile organic compound loss from external floating roofed tanks
    Remote Sensing, 1998
    Co-Authors: Simon J. O Connor, H. L. Walmsley, Humphrey Pasley
    Abstract:

    This work describes how an IR DIAL system has been sued both to measure the emission rates of Volatile Organic Compounds (VOCs) from external floating roof tanks, and in addition, to map the concentration of VOCs over the roofs of tanks. The data presented shows concentration iso-surfaces resolved at 0.2 ppm intervals over an operating 50 m diameter tank. This data will be used to validate subsequent models of tank emissions. The data suggests that when the floating roof is sufficiently low inside the tank a re-circulating air flow is established that extends for several meters into the open air above the tank rim. In this instance the emission rate of product from the tank is the rate of bleed off from the re-Circulation Zone into the free air stream. As the tank roof height is increased, it is expected that a point will be reached where the re-circulating Zone shrinks to a small region near the rim and the majority of the tank roof is exposed to the free stream air flow. The existence of a large re-Circulation Zone when the roof is low is confirmed by the preliminary results of flow measurements above a tank roof.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Hanif Heidari - One of the best experts on this subject based on the ideXlab platform.

  • Lattice Boltzmann simulation of fluid flow and heat transfer in a parallel-plate channel with transverse rectangular cavities
    International Journal of Modern Physics C, 2017
    Co-Authors: Rasul Mohebbi, Hanif Heidari
    Abstract:

    The aim of this paper is investigating the forced convection heat transfer in a channel with transverse rectangular cavities using the lattice Boltzmann method (LBM) which is not available in the literature yet. The effects of the Reynolds number (100–400), cavity aspect ratio ([Formula: see text], 0.5, 1.0), distance of cavities from each other ([Formula: see text]) in fixed depth of cavity ([Formula: see text]) on the velocity and temperature profiles are studied. Moreover, the flow patterns such as deflection and re-Circulation Zone inside the cavities are obtained. The local and averaged Nusselt numbers on the channel walls are achieved. The results show that the channel with cavities achieves heat transfer enhancements relative to the smooth channel. For the constant cavity aspect ratio, the maximum value of averaged Nusselt number in the channel is obtained in the case of [Formula: see text]. Heat transfer to the working fluids increases significantly by increasing the aspect ratio. The existed results are used to ascertain the validity of the numerical code and excellent agreement between results was found.

  • Lattice Boltzmann simulation of fluid flow and heat transfer in a parallel-plate channel with transverse rectangular cavities
    International Journal of Modern Physics C, 2017
    Co-Authors: Rasul Mohebbi, Hanif Heidari
    Abstract:

    The aim of this paper is investigating the forced convection heat transfer in a channel with transverse rectangular cavities using the lattice Boltzmann method (LBM) which is not available in the literature yet. The effects of the Reynolds number (100–400), cavity aspect ratio (AR=0.25, 0.5, 1.0), distance of cavities from each other (S′=0,2,4,6) in fixed depth of cavity (A′=0.5) on the velocity and temperature profiles are studied. Moreover, the flow patterns such as deflection and re-Circulation Zone inside the cavities are obtained. The local and averaged Nusselt numbers on the channel walls are achieved. The results show that the channel with cavities achieves heat transfer enhancements relative to the smooth channel. For the constant cavity aspect ratio, the maximum value of averaged Nusselt number in the channel is obtained in the case of S′=2. Heat transfer to the working fluids increases significantly by increasing the aspect ratio. The existed results are used to ascertain the validity of the numerical code and excellent agreement between results was found.

Dong Kezeng - One of the best experts on this subject based on the ideXlab platform.

  • Effect of hydrodynamic behavior on electrostatic potential distribution in gas–solid fluidized bed
    Powder Technology, 2013
    Co-Authors: Yefeng Zhou, Congjing Ren, Jingdai Wang, Yongrong Yang, Dong Kezeng
    Abstract:

    Abstract In a gas–solid fluidized bed with a newly-designed gas-inlet structure, with gas entering exclusively in the core or annulus Zone separately, changes in the hydrodynamic behavior are observed and thus the electrostatic potential distribution is regulated and controlled. From experiments conducted, electropositive potential in the upper particle Circulation Zone is observed while the bottom part displays electronegative characteristics. Compared to that with a normal gas-inlet condition, the fluidized bed with specific core–annulus gas-inlet structure behaves differently. As the superficial gas velocity is increased, the positively charged Zone, as well as the upper Circulation Zone, expands when the fluidizing gas just enters the core Zone; on the contrary, the negatively charged Zone expands with the superficial gas velocity when fluidizing gas just enters the annular Zone. At lower superficial velocities, the absolute value of the electrostatic potential in the center is less than that at the wall, while the two potential values approach each other when the velocity becomes higher. Moreover, a preliminary mechanism discussion about the effect of the flow pattern on the electrostatic potential distribution has been put forward for understanding the hydrodynamics and the electrostatic field, which is verified with the experimental results.