![]() ![]() The large diameter of the jet relative to the room size makes the overall room air distribution highly sensitive to the parameters of the supply air. The supply air jet is characterized by complex physics, including annular shape, impingement, buoyancy, a large jet to room aspect ratio, and recirculation. Hospital operating rooms require the use of ASHRAE Group E diffusers in an array above the surgical table, providing downward, unidirectional, non-aspirating air flow across the sterile region of the room. A laser sheet illumination technique was used to identify key features of the room air distribution, and particle image velocimetry (PIV) was used to measure the velocity field in a plane crossing the surgical site. ![]() Both qualitative and quantitative flow visualization techniques were used to evaluate the room air distribution in a full-scale chamber designed to simulate a hospital operating room. Room air distribution in hospital operating rooms (OR) is critical to the effective functioning of surgical procedures, but the air distribution patterns are governed by complex physics that are currently not well understood. Keywords: Operating Room Surgical Ventilation Airborne Infection Received Janurevised Februaccepted March 16, 2013 This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 1Department of Civil, Environmental and Architectural Engineering, University of Colorado, Boulder, USAĢDepartment of Mechanical Engineering, University of Colorado, Boulder, USAĮmail: © 2013 James McNeill et al. ![]()
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