The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform

J. W. Sutherland - One of the best experts on this subject based on the ideXlab platform.

  • The evaporation of water from wood at high temperatures
    Wood Science and Technology, 1997
    Co-Authors: A. J. Hunter, J. W. Sutherland
    Abstract:

    When predicting the performance of wood drying processes, Film Coefficients for heat and mass transfer are among the parameters that need to be estimated. Customary methods such as the use of the Lewis relation were originally derived for vapour pressures which were small compared with atmospheric pressure. For high temperature drying of wood it is necessary to extend the associated psychrometric equation to one of more general applicability. Such extension is the subject of this paper. Essential to the analysis is the determination of the rate of change of vapour pressure with temperature adjacent to the wood surface. It is found that when the vapour pressure is not assumed small compared with atmospheric pressure, the above gradient contains a factor P - p_o where P is the atmospheric pressure and p_o is the free stream vapour pressure. At high temperatures and humidities, this factor becomes important and the Film Coefficient for mass transfer increases without limit.

  • The evaporation of water from wood at high temperatures
    Wood Science and Technology, 1997
    Co-Authors: A. J. Hunter, J. W. Sutherland
    Abstract:

    When predicting the performance of wood drying processes, Film Coefficients for heat and mass transfer are among the parameters that need to be estimated. Customary methods such as the use of the Lewis relation were originally derived for vapour pressures which were small compared with atmospheric pressure. For high temperature drying of wood it is necessary to extend the associated psychrometric equation to one of more general applicability. Such extension is the subject of this paper. Essential to the analysis is the determination of the rate of change of vapour pressure with temperature adjacent to the wood surface. It is found that when the vapour pressure is not assumed small compared with atmospheric pressure, the above gradient contains a factor P - p_o where P is the atmospheric pressure and p_o is the free stream vapour pressure. At high temperatures and humidities, this factor becomes important and the Film Coefficient for mass transfer increases without limit.

Arul M Mani - One of the best experts on this subject based on the ideXlab platform.

  • heat transfer characteristics in horizontal tube bundles for falling Film evaporation in multi effect desalination system
    Desalination, 2015
    Co-Authors: Raju Abraham, Arul M Mani
    Abstract:

    Abstract Horizontal tube falling Film evaporation finds wider applications in multi-effect distillation system in recent years. The latent heat released inside the tube due to condensation of vapor is transferred to the falling Film on the outer surface of the tube resulting in convective evaporation of water Film. The evaporator consists of multiple rows and columns of horizontal tubes. Heat transfer from condensing Film inside the tube bundle is more or less uniform while there is a large variation in heat transfer outside the tube bundle. This paper focuses on Computational Fluid Dynamics (CFD) analysis of falling Film evaporation of seawater on a single tube and bundle of tubes using ANSYS Fluent 13.0®. CFD results are validated with published data available in the literature and also with experimental studies carried out. The effect of feed rate, tube diameter, wall temperature, etc. on the heat transfer is studied. Local Film Coefficient around the tubes of 19.05, 25.4 and 50.8 mm ∅ for different Film Reynolds numbers is discussed. It is observed that convective evaporation heat transfer performance increases with feed rate, but decreases with tube diameter. In-line tube configuration is found to be better compared to staggered tube configuration.

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

  • The evaporation of water from wood at high temperatures
    Wood Science and Technology, 1997
    Co-Authors: A. J. Hunter, J. W. Sutherland
    Abstract:

    When predicting the performance of wood drying processes, Film Coefficients for heat and mass transfer are among the parameters that need to be estimated. Customary methods such as the use of the Lewis relation were originally derived for vapour pressures which were small compared with atmospheric pressure. For high temperature drying of wood it is necessary to extend the associated psychrometric equation to one of more general applicability. Such extension is the subject of this paper. Essential to the analysis is the determination of the rate of change of vapour pressure with temperature adjacent to the wood surface. It is found that when the vapour pressure is not assumed small compared with atmospheric pressure, the above gradient contains a factor P - p_o where P is the atmospheric pressure and p_o is the free stream vapour pressure. At high temperatures and humidities, this factor becomes important and the Film Coefficient for mass transfer increases without limit.

  • The evaporation of water from wood at high temperatures
    Wood Science and Technology, 1997
    Co-Authors: A. J. Hunter, J. W. Sutherland
    Abstract:

    When predicting the performance of wood drying processes, Film Coefficients for heat and mass transfer are among the parameters that need to be estimated. Customary methods such as the use of the Lewis relation were originally derived for vapour pressures which were small compared with atmospheric pressure. For high temperature drying of wood it is necessary to extend the associated psychrometric equation to one of more general applicability. Such extension is the subject of this paper. Essential to the analysis is the determination of the rate of change of vapour pressure with temperature adjacent to the wood surface. It is found that when the vapour pressure is not assumed small compared with atmospheric pressure, the above gradient contains a factor P - p_o where P is the atmospheric pressure and p_o is the free stream vapour pressure. At high temperatures and humidities, this factor becomes important and the Film Coefficient for mass transfer increases without limit.

Y.-l. Sun - One of the best experts on this subject based on the ideXlab platform.

  • Characteristics of flow and heat transfer in a tube bundle evaporator with a vapour-liquid-solid flow
    Chemical Engineering Research and Design, 2007
    Co-Authors: Mingyan Liu, Ai-hong Qiang, Y.-l. Sun
    Abstract:

    Abstract In this paper, a tube bundle experimental evaporator with a specific vapour–liquid–solid (V-L-S) flow boiling system with external natural circulating is established to imitate and investigate a typical three-phase flow and boiling heat-transfer characteristics in order to reveal the mechanism of this apparatus. It is shown that under the ranges of the experimental parameters tested, the average heat transfer Film Coefficient hfb increases with increasing of temperature difference between the inside surface of tube wall and the boiling fluid. Lowering holdup of the solid particles enhances the heat transfer process. Meanwhile, the average heat transfer Film Coefficient h in each tube was found to be quite different for different tubes. The addition of solid particles enlarges this difference. The circulating velocity in the tube in V-L-S flow boiling was found to increase with the increase of the overall driving force of heat transfer or temperature difference between the steam and the boiling fluid, and it is higher than that of the V-L flow boiling. Opposite is true for the pressure drop in the tube in V-L-S flow boiling. There is no obvious effect of circulating velocity but there is a clear distinction in the pressure drops when varying the solid holdups. These results may offer some useful data sets to design, scale-up of this type of evaporators.

Ronald E. Rathbun - One of the best experts on this subject based on the ideXlab platform.

  • Volatilization of ketones
    Chemosphere, 2003
    Co-Authors: Ronald E. Rathbun
    Abstract:

    Abstract Volatilization fluxes of seven ketones were measured over a range of temperatures. Gas-Film Coefficients were calculated from these volatilization fluxes and related to the gas-Film Coefficient for the evaporation of water. These relations, when combined with an equation for estimating the gas-Film Coefficient for evaporation of water from a canal, permit estimating gas-Film Coefficients for the volatilization of ketones from streams and rivers.