Human convective boundary layer and its interaction with room ventilation flow

Authors

  • D. Licina,

    Corresponding author
    1. School of Design and Environment, National University of Singapore, Singapore
    2. Civil Engineering, Technical University of Denmark, International Centre for Indoor Environment and Energy, Lyngby, Denmark
    • D. Licina

      School of Design and Environment

      National University of Singapore – Building

      4, Architecture Drive

      Singapore City 117566, Singapore

      Tel.: +45 5029 7735

      Fax: +45 4593 2166

      e-mail: licinadusan@yahoo.com

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  • A. Melikov,

    1. School of Design and Environment, National University of Singapore, Singapore
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  • C. Sekhar,

    1. Civil Engineering, Technical University of Denmark, International Centre for Indoor Environment and Energy, Lyngby, Denmark
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  • K. W. Tham

    1. Civil Engineering, Technical University of Denmark, International Centre for Indoor Environment and Energy, Lyngby, Denmark
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Abstract

This study investigates the interaction between the human convective boundary layer (CBL) and uniform airflow with different velocity and from different directions. Human body is resembled by a thermal manikin with complex body shape and surface temperature distribution as the skin temperature of an average person. Particle image velocimetry (PIV) and pseudocolor visualization (PCV) are applied to identify the flow around the manikin's body. The findings show that the direction and magnitude of the surrounding airflows considerably influence the airflow distribution around the human body. Downward flow with velocity of 0.175 m/s does not influence the convective flow in the breathing zone, while flow at 0.30 m/s collides with the CBL at the nose level reducing the peak velocity from 0.185 to 0.10 m/s. Transverse horizontal flow disturbs the CBL at the breathing zone even at 0.175 m/s. A sitting manikin exposed to airflow from below with velocity of 0.30 and 0.425 m/s assisting the CBL reduces the peak velocity in the breathing zone and changes the flow pattern around the body, compared to the assisting flow of 0.175 m/s or quiescent conditions. In this case, the airflow interaction is strongly affected by the presence of the chair.

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