IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v16y2023i3p1079-d1040301.html
   My bibliography  Save this article

Study of Influence of Boundary Condition of Diffuser with Non-Uniform Velocity on the Jet Characteristics and Indoor Flow Field

Author

Listed:
  • Kaijun Li

    (School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Linye Song

    (School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Xinghui Zhang

    (School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Qi Wang

    (School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Jing Hua

    (School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract

In practice, the outflow from a diffuser is highly non-uniform due to many reasons. However, the air outflow velocity from a diffuser is uniform in most current studies. Little research has been conducted to determine under what conditions uniform velocity can be used. Therefore, based on the non-uniformity of velocity, airflow characteristics of grille and ceiling diffusers were investigated experimentally and numerically. Two generic CFD cases (non-uniform and uniform velocity) are presented. The velocity field near the diffuser is investigated with measurements in order to determine velocity-inlet boundary conditions. The study shows that the uniform velocity-inlet boundary condition can be considered accurate only under certain conditions. For the grille diffuser, the aspect ratio affects the distribution of the outflow velocity. Using uniform velocity as the velocity-inlet boundary condition for the grille diffuser would result in at least a 14.2% error in the jet region, except when the outflow aspect ratio is 1 and the average velocity is greater than 1.83 m/s. However, when the average velocity of the ceiling diffuser is 3.64 m/s, the error of using uniform velocity as the velocity-inlet boundary condition reaches 58.3%. This study provides the basis for determining the velocity-inlet boundary conditions during numerical simulations.

Suggested Citation

  • Kaijun Li & Linye Song & Xinghui Zhang & Qi Wang & Jing Hua, 2023. "Study of Influence of Boundary Condition of Diffuser with Non-Uniform Velocity on the Jet Characteristics and Indoor Flow Field," Energies, MDPI, vol. 16(3), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1079-:d:1040301
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/16/3/1079/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/16/3/1079/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Joanna Halibart & Klaudia Zwolińska & Marek Borowski & Marek Jaszczur, 2021. "Analysis of the Velocity Distribution in the Plenum Box with Various Entries," Energies, MDPI, vol. 14(12), pages 1-17, June.
    2. Maria Hurnik & Jan Kaczmarczyk & Zbigniew Popiolek, 2021. "Study of Radial Wall Jets from Ceiling Diffusers at Variable Air Volume," Energies, MDPI, vol. 14(1), pages 1-18, January.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Marek Borowski & Rafał Łuczak & Joanna Halibart & Klaudia Zwolińska & Michał Karch, 2021. "Airflow Fluctuation from Linear Diffusers in an Office Building: The Thermal Comfort Analysis," Energies, MDPI, vol. 14(16), pages 1-19, August.
    2. Yat Huang Yau & Umair Ahmed Rajput & Altaf Hussain Rajpar & Natalia Lastovets, 2022. "Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study," Energies, MDPI, vol. 15(4), pages 1-23, February.
    3. Joanna Halibart & Klaudia Zwolińska & Marek Borowski & Marek Jaszczur, 2021. "Analysis of the Velocity Distribution in the Plenum Box with Various Entries," Energies, MDPI, vol. 14(12), pages 1-17, June.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1079-:d:1040301. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.