The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform

Andrew D S Rees - One of the best experts on this subject based on the ideXlab platform.

  • finite peclet number forced convection past a sphere in a porous medium using a thermal nonequilibrium model
    Heat and Mass Transfer, 2008
    Co-Authors: Hilda H Y Kwan, Andrew D S Rees
    Abstract:

    We study the finite-Peclet number forced convective heat transfer from a uniform temperature sphere placed in otherwise uniform Fluid Stream within a porous medium. A numerical study is undertaken to determine how the lack of local thermal equilibrium between the phases affects temperature fields of the two phases and the respective rates of heat transfer from the sphere. On the upStream side of the sphere the temperature field extends further from the sphere in the solid phase than it does for the Fluid phase, but the opposite is true on the downStream side.

  • forced convection past a heated cylinder in a porous medium using a thermal nonequilibrium model finite peclet number effects
    International Journal of Thermal Sciences, 2004
    Co-Authors: Sam W Wong, Andrew D S Rees
    Abstract:

    Abstract We study the forced convective heat transfer from a uniform temperature cylinder placed perpendicular to an otherwise uniform Fluid Stream in a porous medium at finite values of the Peclet number. Attention is focused on how the absence of local thermal equilibrium between the solid and Fluid phases affects the temperature fields of the two phases and the rates of heat transfer from the cylinder. Detailed numerical results are given for a wide range of parameter values. On the upStream side of the cylinder the temperature field extends further from the cylinder in the solid phase than it does for the Fluid phase, but the opposite is true on the downStream side.

Timothy G. Leighton - One of the best experts on this subject based on the ideXlab platform.

  • An activated Fluid Stream - New techniques for cold water cleaning
    Ultrasonics Sonochemistry, 2016
    Co-Authors: P. R. Birkin, D. G. Offin, Timothy G. Leighton
    Abstract:

    Electrochemical, acoustic and imaging techniques are used to characterise surface cleaning with particular emphasis on the understanding of the key phenomena relevant to surface cleaning. A range of novel techniques designed to enhance and monitor the effective cleaning of a solid/liquid interface is presented. Among the techniques presented, mass transfer of material to a sensor embedded in a surface is demonstrated to be useful in the further exploration of ultrasonic cleaning of high aspect ratio micropores. In addition the effect of micropore size on the cleaning efficacy is demonstrated. The design and performance of a new cleaning system reliant on the activation of bubbles within a free flowing Stream is presented. This device utilised acoustic activation of bubbles within the Stream and at a variety of substrates. Finally, a controlled bubble swarm is generated in the Stream using electrolysis, and its effect on both acoustic output and cleaning performance are compared to the case when no bubbles are added. This will demonstrate the active role that the electrochemically generated bubble swarm can have in extending the spatial zone over which cleaning is achieved.

  • An activated Fluid Stream – new techniques for cold water cleaning
    Ultrasonics Sonochemistry, 2015
    Co-Authors: P. R. Birkin, D. G. Offin, Timothy G. Leighton
    Abstract:

    Electrochemical, acoustic and imaging techniques are used to characterise surface cleaning with particular emphasis on the understanding of the key phenomena relevant to surface cleaning. A range of novel techniques designed to enhance and monitor the effective cleaning of a solid/liquid interface is presented. Among the techniques presented, mass transfer of material to a sensor embedded in a surface is demonstrated to be useful in the further exploration of ultrasonic cleaning of high aspect ratio micropores. In addition the effect of micropore size on the cleaning efficacy is demonstrated. The design and performance of a new cleaning system reliant on the activation of bubbles within a free flowing Stream is presented. This device utilised acoustic activation of bubbles within the Stream and at a variety of substrates. Finally, a controlled bubble swarm is generated in the Stream using electrolysis, and its effect on both acoustic output and cleaning performance are compared to the case when no bubbles are added. This will demonstrate the active role that the electrochemically generated bubble swarm can have in extending the spatial zone over which cleaning is achieved.

Sam W Wong - One of the best experts on this subject based on the ideXlab platform.

  • forced convection past a heated cylinder in a porous medium using a thermal nonequilibrium model finite peclet number effects
    International Journal of Thermal Sciences, 2004
    Co-Authors: Sam W Wong, Andrew D S Rees
    Abstract:

    Abstract We study the forced convective heat transfer from a uniform temperature cylinder placed perpendicular to an otherwise uniform Fluid Stream in a porous medium at finite values of the Peclet number. Attention is focused on how the absence of local thermal equilibrium between the solid and Fluid phases affects the temperature fields of the two phases and the rates of heat transfer from the cylinder. Detailed numerical results are given for a wide range of parameter values. On the upStream side of the cylinder the temperature field extends further from the cylinder in the solid phase than it does for the Fluid phase, but the opposite is true on the downStream side.

P. R. Birkin - One of the best experts on this subject based on the ideXlab platform.

  • An activated Fluid Stream - New techniques for cold water cleaning
    Ultrasonics Sonochemistry, 2016
    Co-Authors: P. R. Birkin, D. G. Offin, Timothy G. Leighton
    Abstract:

    Electrochemical, acoustic and imaging techniques are used to characterise surface cleaning with particular emphasis on the understanding of the key phenomena relevant to surface cleaning. A range of novel techniques designed to enhance and monitor the effective cleaning of a solid/liquid interface is presented. Among the techniques presented, mass transfer of material to a sensor embedded in a surface is demonstrated to be useful in the further exploration of ultrasonic cleaning of high aspect ratio micropores. In addition the effect of micropore size on the cleaning efficacy is demonstrated. The design and performance of a new cleaning system reliant on the activation of bubbles within a free flowing Stream is presented. This device utilised acoustic activation of bubbles within the Stream and at a variety of substrates. Finally, a controlled bubble swarm is generated in the Stream using electrolysis, and its effect on both acoustic output and cleaning performance are compared to the case when no bubbles are added. This will demonstrate the active role that the electrochemically generated bubble swarm can have in extending the spatial zone over which cleaning is achieved.

  • An activated Fluid Stream – new techniques for cold water cleaning
    Ultrasonics Sonochemistry, 2015
    Co-Authors: P. R. Birkin, D. G. Offin, Timothy G. Leighton
    Abstract:

    Electrochemical, acoustic and imaging techniques are used to characterise surface cleaning with particular emphasis on the understanding of the key phenomena relevant to surface cleaning. A range of novel techniques designed to enhance and monitor the effective cleaning of a solid/liquid interface is presented. Among the techniques presented, mass transfer of material to a sensor embedded in a surface is demonstrated to be useful in the further exploration of ultrasonic cleaning of high aspect ratio micropores. In addition the effect of micropore size on the cleaning efficacy is demonstrated. The design and performance of a new cleaning system reliant on the activation of bubbles within a free flowing Stream is presented. This device utilised acoustic activation of bubbles within the Stream and at a variety of substrates. Finally, a controlled bubble swarm is generated in the Stream using electrolysis, and its effect on both acoustic output and cleaning performance are compared to the case when no bubbles are added. This will demonstrate the active role that the electrochemically generated bubble swarm can have in extending the spatial zone over which cleaning is achieved.

M. Mosavi-mashhadi - One of the best experts on this subject based on the ideXlab platform.

  • Study on pH-sensitive hydrogel micro-valves: A Fluid–structure interaction approach
    Journal of Intelligent Material Systems and Structures, 2017
    Co-Authors: Nasser Arbabi, J. Abdolahi, Hossein Mazaheri, Mostafa Baghani, M. Mosavi-mashhadi
    Abstract:

    © 2016, © The Author(s) 2016. Hydrogels are categorized as soft materials that undergo large deformation when they are subjected to even minor external forces. In this work, the performance of a variety of micro-valves, based on pH-sensitive hydrogel jackets coated on rigid pillars, is studied considering the gel deformation under Fluid flow, employing Fluid–structure interaction simulations. In this regard, an analytical solution to plane-strain inhomogeneous swelling of a cylindrical jacket is proposed. This is used as a tool to validate the finite element model. Then, a micro-valve consisting of one hydrogel jacket is studied in various inlet pressure and pH values performing Fluid–structure interaction simulations. Thereafter, a variety of jacket patterns are investigated in order to identify the effects of the pattern on the micro-valve performance for various Fluid Stream pressures and pH values. The leakage pressure of the valves is also computed for each of the patterns. Fluid–structure interaction simulation is found to be essential to accurate design of the hydrogel-based microFluidic devices.