Experimental Investigation of Operating Room Air Distribution in a Full-Scale Laboratory Chamber Using Particle Image Velocimetry and Flow Visualization


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. 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. 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. 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. The supply air jet is characterized by complex physics, including annular shape, impingement, buoyancy, a large jet to room aspect ratio, and recirculation. 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 air distribution pattern in the room was found to have relatively low velocity and turbulence near the supply air diffuser, but increasing velocity and turbulence in the shear region at the edge of the supply air jet. Flow visualization and PIV methods both demonstrated an angle of the shear layer inwards towards the center of the jet. This flow feature reduces the overall coverage area for the sterile air flow and may pose a risk to the protection of the surgical patient.

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J. McNeill, J. Hertzberg and Z. Zhai, "Experimental Investigation of Operating Room Air Distribution in a Full-Scale Laboratory Chamber Using Particle Image Velocimetry and Flow Visualization," Journal of Flow Control, Measurement & Visualization, Vol. 1 No. 1, 2013, pp. 24-32. doi: 10.4236/jfcmv.2013.11005.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] J. G. Whitcomb and W. E. Clapper, “Ultraclean Operating Room,” The American Journal of Surgery, Vol. 112, No. 5, 1966, pp. 681-685. doi:10.1016/0002-9610(66)90104-8
[2] R. Blowers and B. Crew, “Ventilation of Operating-Theatres,” Epidemiology & Infection, Vol. 58, No. 4, 1960, pp. 427-448. doi:10.1017/S0022172400038572
[3] B. Friberg, S. Friberg, L. G. Burman, R. Lundholm and R. ?stensson, “Inefficiency of Upward Displacement Operating Theatre Ventilation,” Journal of Hospital Infection, Vol. 33, No. 4, 1996, pp. 263-272. doi:10.1016/S0195-6701(96)90012-2
[4] J. R. Lewis, “Operating Room Air Distribution Effectiveness,” ASHRAE Transactions, Vol. 99, No. 2, 1993, pp. 1191-1200.
[5] F. Memarzadeh and A. P. Manning, “Comparison of Operating Room Ventilation Systems in the Protection of The Surgical Site/Discussion,” ASHRAE Transactions, Vol. 108, No. 2, 2002, p. 3.
[6] F. Memarzadeh and J. Jiang, “Effect of Operation Room Geometry and Ventilation System Parameter Variations on the Protection of the Surgical Site,” Proceeding of IAQ 2004, Tampa, 15-17 March 2004.
[7] ASHRAE TC 9.6, “ANSI/ASHRAE Standard 170-2008. Ventilation of Healthcare Facilities,” American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., Atlanta, 2008.
[8] Y. Li, G. M. Leung, J. W. Tang, X. Yang, C. Y. H. Chao, J. Z. Lin, J. W. Lu, P. V. Nielsen, J. Niu, et al., “Role of Ventilation in Airborne Transmission of Infectious Agents in the Built Environment—A Multidisciplinary Systematic Review,” Indoor Air, Vol. 17, No. 1, 2007, pp. 2- 18. doi:10.1111/j.1600-0668.2006.00445.x
[9] T.-T. Chow and X.-Y. Yang, “Performance of Ventilation System in a Non-Standard Operating Room,” Building and Environment, Vol. 38, No. 12, 2003, pp. 1401-1411. doi:10.1016/S0360-1323(03)00155-0
[10] M. Woloszyn, J. Virgone, and S. Mélen, “Diagonal Air-Distribution System for Operating Rooms: Experiment and Modeling,” Building and Environment, Vol. 39, No. 10, 2004, pp. 1171-1178. doi:10.1016/j.buildenv.2004.03.013
[11] T. T. Chow and X. Y. Yang, “Ventilation Performance in the Operating Theatre against Airborne Infection: Numerical Study on an Ultra-Clean System,” Journal of Hospital Infection, Vol. 59, No. 2, 2005, pp. 138-147. doi:10.1016/j.jhin.2004.09.006
[12] T. T. Chow, Z. Lin and W. Bai, “The Integrated Effect of Medical Lamp Position and Diffuser Discharge Velocity on Ultraclean Ventilation Performance in an Operating Theatre,” Indoor and Built Environment Vol. 15, No. 4, 2006, pp. 315-331. doi:10.1177/1420326X06067802
[13] H. Brohus, K. D. Balling and D. Jeppesen, “Influence of Movements on Contaminant Transport in an Operating Room,” Indoor Air, Vol. 16, No. 5, 2006, pp. 356-372. doi:10.1111/j.1600-0668.2006.00454.x
[14] J. E. Woods, D.T. Brayman, R. W. Rasmussen, G. L. Reynolds and G. M. Montag, “Ventilation Requirements in Hospital Operating Rooms—Part I: Control of Airborne Particles,” ASHRAE Transactions, Vol. 92, 1986, pp. 396-426.
[15] J. S. McNeill, Z. (John) Zhai and J. Hertzberg, “Field Measurements of Thermal Conditions during Surgical Procedures for the Development of CFD Boundary Conditions,” ASHRAE Transactions, Vol. 118, No. 2, 2012, pp. 596-609.
[16] M. Sandberg, “Whole-Field Measuring Methods in Ventilated Rooms,” HVAC&R Research, Vol. 13, No. 6, 2007, pp. 951-970. doi:10.1080/10789669.2007.10391464
[17] G. Cao, M. Sivukari, J. Kurnitski, M. Ruponen and O. Sepp?nen, “Particle Image Velocimetry (PIV) Application in the Measurement of Indoor Air Distribution by an Active Chilled Beam,” Building and Environment, Vol. 45, No. 9, 2010, pp. 1932-1940. doi:10.1016/j.buildenv.2009.11.020
[18] D. Marr, T. Khan, Mark Glauser, Hiroshi Higuchi and J. Zhang, “On Particle Image Velocimetry (PIV) Measurements in the Breathing Zone of a Thermal Breathing Manikin,” ASHRAE Transactions, Vol. 111, No. 2, 2005, pp. 299-305.
[19] L. Zhao, Y. Zhang, X. Wang, G. L. Riskowski and L. L. Christianson, “Development of PIV Techniques to Measure Airflow Patterns in Ventilated Airspaces,” ASHRAE Transactions, Vol. 105, No. 2, 1999, pp. 1098-1107.
[20] S. Zhu, S. Kato and J.-H. Yang, “Study on Transport Characteristics of Saliva Droplets Produced by Coughing in a Calm Indoor Environment,” Building and Environment Vol. 41, No. 12, 2006, pp. 1691-1702. doi:10.1016/j.buildenv.2005.06.024
[21] S. Varughese, K. Teschke, M. Brauer, Y. Chow, C. van Netten and S. M. Kennedy, “Effects of Theatrical Smokes and Fogs on Respiratory Health in the Entertainment Industry,” American Journal of Industrial Medicine, Vol. 47, No. 5, 2005, pp. 411-418. doi:10.1002/ajim.20151
[22] G. D. Boehler, “Aerodynamic Theory of the Annular Jet,” Aerophysics Co., Washington, DC, 1959.

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